PHP全栈学习笔记7

图形图像处理技术，gd库的强大支持，PHP的图像可以是PHP的强项，PHP图形化类库，jpgraph是一款非常好用的强大的图形处理工具。

在PHP中加载GD库

gd官方网址下载：

http://www.boutell.com/gd

激活gd库，修改php.in文件

将该文件中的“;extension=php_gd2.dll”选项前的分号“;”删除

验证GD库是否安装成功
输入“127.0.0.1/phpinfo.php”并按Enter键，检索到的安装信息，即说明GD库安装成功。

Jpgraph的安装与配置

官方网站http://www.aditus.nu/jpgraph/下载

解压到文件夹，编辑php.ini文件，修改include_path参数，如include_path = “.;F:\AppServ\www\jpgraph”，重新启动Apache。

配置Jpgraph类库的文件jpg-config.inc.php，
支持中文的配置

DEFINE('CHINESE_TTF_FONT','bkai00mp.ttf');

默认图片格式的配置

DEFINE("DEFAULT_GFORMAT","auto");

创建画布，可以通过imagecreate()函数实现

<?php
$im = imagecreate(200,100);
$white = imagecolorallocate($im, 255,65,150);
imagegif($im);
?>

gd库支持中文，但只能是utf-8，使用imageString()会显示乱码，只能接收utf-8编码格式，默认使用英文字体。

header()函数定义输出图像类型
imagecreatefromjpeg()函数载入图片
imagecolorallocate()函数设置输出字体颜色
iconv()函数对输出的中文字符串的编码格式进行转换
imageTTFText()函数向照片中添加文字

<?php
header("content-type:image/jpeg");
$im = imagecreateformjpeg("images/photo.jpg");
$textcolor = imagecolorallocate($im, 35,35,23);//定义字体
$fnt="c:/windows/fonts/simhei.ttf";
//定义输出字体串
$motto = iconv("gb2312","utf-8","长白山");
// 写文字
imageTTFText($im, 220,0,200,233, $textcolor, $fnt, $motto); // 写TTF文字到图中
// 简历里jpeg图形
imageipeg($im);
imagedestory($im);
?>

使用图像处理技术生成的验证码

<?php
session_start();
header("content-type:image/png");       //设置创建图像的格式
$image_width=70;                      //设置图像宽度
$image_height=18;                     //设置图像高度
srand(microtime()*100000);            //设置随机数的种子
for($i=0;$i<4;$i++){                  //循环输出一个4位的随机数$new_number.=dechex(rand(0,15));
}
$_SESSION[check_checks]=$new_number;    //将获取的随机数验证码写入到SESSION变量中     $num_image=imagecreate($image_width,$image_height);  //创建一个画布
imagecolorallocate($num_image,255,255,255);          //设置画布的颜色
for($i=0;$i<strlen($_SESSION[check_checks]);$i++){  //循环读取SESSION变量中的验证码$font=mt_rand(3,5);                              //设置随机的字体$x=mt_rand(1,8)+$image_width*$i/4;               //设置随机字符所在位置的X坐标$y=mt_rand(1,$image_height/4);                   //设置随机字符所在位置的Y坐标$color=imagecolorallocate($num_image,mt_rand(0,100),mt_rand(0,150),mt_rand(0,200));       //设置字符的颜色imagestring($num_image,$font,$x,$y,$_SESSION[check_checks][$i],$color);                    //水平输出字符
}
imagepng($num_image);               //生成PNG格式的图像
imagedestroy($num_image);           //释放图像资源
?>

<?php
session_start();
if($_POST["Submit"]!=""){
$checks=$_POST["checks"];
if($checks==""){
echo "<script> alert('验证码不能为空');window.location.href='index.php';</script>";
}
if($checks==$_SESSION[check_checks]){echo "<script> alert('用户登录成功!');window.location.href='index.php';</script>";
}else{echo "<script> alert('您输入的验证码不正确!');window.location.href='index.php';</script>";
}
}
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>验证码应用</title>
<style type="text/css">
<!--
.STYLE1 {font-size: 12px;color: #FFFFFF;font-weight: bold;
}
.style2 {font-weight: bold; font-size: 12px;}
-->
</style>
</head>
<body>
<form name="form" method="post" action=""><table width="1003" border="0" cellspacing="0" cellpadding="0"><tr><td width="168" height="169" background="images/index_01.gif">&nbsp;</td><td width="685" background="images/index_02.gif">&nbsp;</td><td width="150" background="images/index_03.gif">&nbsp;</td></tr><tr><td width="168" height="311" background="images/index_04.gif">&nbsp;</td><td background="images/index_05.gif"><table width="675" height="169"  border="0" cellpadding="0" cellspacing="0"><tr><td height="43" align="center" valign="baseline">&nbsp;</td><td align="center" valign="middle">&nbsp;</td><td align="center" valign="baseline">&nbsp;</td></tr><tr><td width="382" height="24" align="center" valign="baseline">&nbsp;</td><td width="207" height="24" valign="middle"><span class="style2">用户名</span><span class="STYLE1"><input  name="txt_user" id="txt_user" style="height:20px " size="10"></span></td><td width="86" height="24" align="center" valign="baseline">&nbsp;</td></tr><tr><td height="24" align="center" valign="baseline">&nbsp;</td><td height="24" valign="middle"><span class="style2">密码</span><span class="STYLE1"><input  name="txt_pwd" type="password" id="txt_pwd" style="FONT-SIZE: 9pt; height:20px" size="10"></span></td><td height="24" align="center" valign="baseline">&nbsp;</td></tr><tr><td height="24" align="center" valign="baseline">&nbsp;</td><td height="24" valign="middle"><span class="style2">验证码</span><span class="STYLE1"><input name="checks" size="6" style="height:20px "><img src="checks.php" width="70" height="18" border="0" align="bottom"></span>&nbsp;&nbsp;</td><td height="24" align="center" valign="baseline">&nbsp;</td></tr><tr><td height="40" align="center" valign="baseline">&nbsp;</td><td align="center" valign="baseline">&nbsp;&nbsp;&nbsp;&nbsp;<input type="submit" name="Submit" value="登录"></td><td align="center" valign="baseline">&nbsp;</td></tr></table></td><td background="images/index_06.gif">&nbsp;</td></tr><tr><td height="100">&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr></table>
</form>
</body>
</html>

使用柱形图

<?php
include ("jpgraph/jpgraph.php");
include ("jpgraph/jpgraph_bar.php");$datay=array(160,180,203,289,405,488,489,408,299,166,187,105);//创建画布
$graph = new Graph(600,300,"auto");
$graph->SetScale("textlin");
$graph->yaxis->scale->SetGrace(20);//创建画布阴影
$graph->SetShadow();//设置显示区左、右、上、下距边线的距离，单位为像素
$graph->img->SetMargin(40,30,30,40);//创建一个矩形的对象
$bplot = new BarPlot($datay);//设置柱形图的颜色
$bplot->SetFillColor('orange');
//设置显示数字
$bplot->value->Show();
//在柱形图中显示格式化的图书销量
$bplot->value->SetFormat('%d');
//将柱形图添加到图像中
$graph->Add($bplot);//设置画布背景色为淡蓝色
$graph->SetMarginColor("lightblue");//创建标题
$graph->title->Set("《PHP》");//设置X坐标轴文字
$a=array("1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月");
$graph->xaxis->SetTickLabels($a); //设置字体
$graph->title->SetFont(FF_SIMSUN);
$graph->xaxis->SetFont(FF_SIMSUN); //输出矩形图表
$graph->Stroke();
?>

使用折线图统计

<?phpinclude ("jpgraph/jpgraph.php");include ("jpgraph/jpgraph_line.php");                                                        //引用折线图LinePlot类文件$datay = array(8320,9360,14956,17028,13060,15376,25428,16216,28548,18632,22724,28460);       //填充的数据   $graph = new Graph(600,300,"auto");                                //创建画布$graph->img->SetMargin(50,40,30,40);                            //设置统计图所在画布的位置，左边距50、右边距40、上边距30、下边距40，单位为像素$graph->img->SetAntiAliasing();                                 //设置折线的平滑状态$graph->SetScale("textlin");                                    //设置刻度样式$graph->SetShadow();                                         //创建画布阴影$graph->title->Set("2000年PHP图书月销售额折线图");    //设置标题$graph->title->SetFont(FF_SIMSUN,FS_BOLD);                      //设置标题字体$graph->SetMarginColor("lightblue");                           //设置画布的背景颜色为淡蓝色$graph->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD);               //设置Y轴标题的字体$graph->xaxis->SetPos("min");$graph->yaxis->HideZeroLabel();$graph->ygrid->SetFill(true,'#EFEFEF@0.5','#BBCCFF@0.5');$a=array("1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月");            //X轴$graph->xaxis->SetTickLabels($a);                                 //设置X轴$graph->xaxis->SetFont(FF_SIMSUN);                              //设置X坐标轴的字体$graph->yscale->SetGrace(20); $p1 = new LinePlot($datay);                                     //创建折线图对象$p1->mark->SetType(MARK_FILLEDCIRCLE);                           //设置数据坐标点为圆形标记$p1->mark->SetFillColor("red");                                   //设置填充的颜色$p1->mark->SetWidth(4);                                          //设置圆形标记的直径为4像素$p1->SetColor("blue");                                          //设置折形颜色为蓝色$p1->SetCenter();                                             //在X轴的各坐标点中心位置绘制折线$graph->Add($p1);                                              //在统计图上绘制折线$graph->Stroke();                                             //输出图像
?>

应用3D饼形图

<?php
include_once ("jpgraph/jpgraph.php");
include_once ("jpgraph/jpgraph_pie.php");
include_once ("jpgraph/jpgraph_pie3d.php");           //引用3D饼图PiePlot3D对象所在的类文件$data = array(266036,295621,335851,254256,254254,685425);         //定义数组
$graph = new PieGraph(540,260,'auto');               //创建画布
$graph->SetShadow();                             //设置画布阴影$graph->title->Set("应用3D饼形图统计2000年商品的年销售额比率");          //创建标题
$graph->title->SetFont(FF_SIMSUN,FS_BOLD);            //设置标题字体
$graph->legend->SetFont(FF_SIMSUN,FS_NORMAL);         //设置图例字体$p1 = new PiePlot3D($data);                            //创建3D饼形图对象
$p1->SetLegends(array("IT数码","家电通讯","家居日用","服装鞋帽","健康美容","食品烟酒"));
$targ=array("pie3d_csimex1.php?v=1","pie3d_csimex1.php?v=2","pie3d_csimex1.php?v=3","pie3d_csimex1.php?v=4","pie3d_csimex1.php?v=5","pie3d_csimex1.php?v=6");
$alts=array("val=%d","val=%d","val=%d","val=%d","val=%d","val=%d");
$p1->SetCSIMTargets($targ,$alts);$p1->SetCenter(0.4,0.5);                 //设置饼形图所在画布的位置
$graph->Add($p1);                            //将3D饼图形添加到图像中
$graph->StrokeCSIM();                        //输出图像到浏览器?>

应用柱形图依次统计2000年月销量

<?php
include ("jpgraph/jpgraph.php");
include ("jpgraph/jpgraph_bar.php");$datay1=array(58,85,65,39,120,91,152,49,97,130,67);
$datay2=array(18,35,101,69,138,131,112,149,88,60,77);$graph = new Graph(620,300,'auto');
$graph->SetScale("textlin");
$graph->SetShadow();
$graph->SetMarginColor("yellow");                          //设置画布背景色为淡蓝色
$graph->img->SetMargin(40,30,40,40);
$graph->xaxis->SetTickLabels($gDateLocale->GetShortMonth());$graph->xaxis->title->Set('');
$graph->xaxis->title->SetFont(FF_SIMSUN,FS_BOLD);$graph->title->Set('应用柱形图依次统计2000年月销量');
$graph->title->SetFont(FF_SIMSUN,FS_BOLD);$bplot1 = new BarPlot($datay1);
$bplot2 = new BarPlot($datay2);$bplot1->SetFillColor("orange");
$bplot2->SetFillColor("lightblue");$bplot1->SetShadow();
$bplot2->SetShadow();$bplot1->SetShadow();
$bplot2->SetShadow();$gbarplot = new GroupBarPlot(array($bplot1,$bplot2));
$gbarplot->SetWidth(0.6);
$graph->Add($gbarplot);$graph->Stroke();
?>

轿车的月销量统计

<?php
include ("jpgraph/jpgraph.php");
include ("jpgraph/jpgraph_line.php");
include ("jpgraph/jpgraph_scatter.php");$datay1 = array(83,57,93,112,142,112,89,125,69,105,118,75);              //定义数组//创建画布
$graph = new Graph(620,260);
$graph->SetMarginColor('red');
$graph->SetScale("textlin");
$graph->SetFrame(false);
$graph->SetMargin(30,5,25,20);//创建标签标题、颜色、文字大小等属性
$graph->tabtitle->Set(' 2000年轿车的月销量统计  ' );
$graph->tabtitle->SetFont(FF_SIMSUN,FS_NORMAL,10);
$graph->tabtitle->SetColor('darkred','yellow');
// 设置X轴网格
$graph->xgrid->Show();//应用月份做为X轴的坐标
$graph->xaxis->SetTickLabels($gDateLocale->GetShortMonth());//创建折线对象
$p1 = new LinePlot($datay1);
$p1->SetColor("navy");$p1->mark->SetType(MARK_IMG,'car.gif',0.8);              //载入汽车模型标记，并限制其输出大小//输出汽车模型标记的位置
$p1->value->SetFormat('%d');
$p1->value->Show();
$p1->value->SetColor('darkred');
$p1->value->SetFont(FF_ARIAL,FS_BOLD,10);
$p1->value->SetMargin(14);                    //设置汽车销量距汽车模型标记的距离$p1->SetCenter();          //设置汽车销量及模型在X轴各坐标点居中显示
$graph->Add($p1);            //添加折线图到图像中
$graph->Stroke();            //输出图像到浏览器?>

统计2006年、2007年、2008年、2009年农产品的产量比率

<?php
include ("jpgraph/jpgraph.php");
include ("jpgraph/jpgraph_pie.php");//定义数组
$data1 = array(40,21,17,14,23);
$data2 = array(60,54,107,24,83);
$data3 = array(52,151,99,110,223);
$data4 = array(70,181,117,114,33);//创建画布
$graph = new PieGraph(600,350,"auto");
$graph->SetShadow();//设置标题名称
$graph->title->Set("统计2006年、2007年、2008年、2009年农产品的产量比率");
$graph->title->SetFont(FF_SIMSUN,FS_BOLD);
$graph->legend->SetFont(FF_SIMSUN,FS_NORMAL);//创建饼形图对象
$size=0.13;
$p1 = new PiePlot($data1);
$p1->SetLegends(array("大豆","玉米","水稻","小麦","高梁"));
$p1->SetSize($size);
$p1->SetCenter(0.25,0.32);
$p1->value->SetFont(FF_FONT0);
$p1->title->Set("2006年");
$p1->title->SetFont(FF_SIMSUN,FS_BOLD);$p2 = new PiePlot($data2);
$p2->SetSize($size);
$p2->SetCenter(0.65,0.32);
$p2->value->SetFont(FF_FONT0);
$p2->title->Set("2007年");
$p2->title->SetFont(FF_SIMSUN,FS_BOLD);$p3 = new PiePlot($data3);
$p3->SetSize($size);
$p3->SetCenter(0.25,0.75);
$p3->value->SetFont(FF_FONT0);
$p3->title->Set("2008年");
$p3->title->SetFont(FF_SIMSUN,FS_BOLD);$p4 = new PiePlot($data4);
$p4->SetSize($size);
$p4->SetCenter(0.65,0.75);
$p4->value->SetFont(FF_FONT0);
$p4->title->Set("2009年");
$p4->title->SetFont(FF_SIMSUN,FS_BOLD);$graph->Add($p1);
$graph->Add($p2);
$graph->Add($p3);
$graph->Add($p4);$graph->Stroke();?>

文件系统

文件是用来存储数据的方式之一。
打开文件，关闭文件，读写文件，操作文件。

打开文件

resource fopen ( string filename, string mode [, bool use_include_path]);

关闭文件

bool fclose ( resource handle ) ;<?php$f_open =fopen("../file.txt.","rb");      //打开文件…    //对文件进行操作fclose($f_open)   //操作完成后关闭文件
?>

读取数据
可以读取一个字符,一行字串,整个文件
读取文件：readfile()、file()和file_get_contents()

readfile()函数
读入一个文件并将其写入到输出缓冲

int readfile(string filename)

file()函数读取整个文件的内容
file()函数将文件内容按行存放到数组中

array file(string filename)

file_get_contents()函数
将文件内容（filename）读入一个字符串

string file_get_contents(string filename[,int offset[,int maxlen]])

案例：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>读取整个文件</title>
<style type="text/css">
<!--
body,td,th {font-size: 12px;
}
body {margin-left: 10px;margin-top: 10px;margin-right: 10px;margin-bottom: 10px;
}
-->
</style></head>
<body>
<table border="1" cellspacing="0" cellpadding="0"><tr><td width="250" height="25" align="right" valign="middle" scope="col">使用readfile()函数读取文件内容：</td><td height="25" align="center" valign="middle" scope="col"><?php readfile('tm.txt'); ?>  </td></tr><tr><td height="25" align="right" valign="middle">使用file()函数读取文件内容：</td><td height="25" align="center" valign="middle"><?php$f_arr = file('tm.txt');foreach($f_arr as $cont){echo $cont."<br>";}?></td></tr><tr><td width="250" height="25" align="right" valign="middle" scope="col">使用file_get_contents()函数读取文件内容：</td><td height="25" align="center" valign="middle" scope="col"><?php$f_chr = file_get_contents('tm.txt');echo $f_chr;?></td></tr>
</table>
</body>
</html>

读取一行数据：fgets()和fgetss()

fgets()函数用于一次读取一行数据

string fgets( int handle [, int length] )

fgetss()函数是fgets()函数的变体，用于读取一行数据

string fgetss ( resource handle [, int length [, string
allowable_tags]] )

fgets和fgetss的区别

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>fgets和fgetss的区别</title>
<style type="text/css">
<!--
body,td,th {font-size: 12px;
}
body {margin-left: 10px;margin-top: 10px;margin-right: 10px;margin-bottom: 10px;
}
-->
</style></head>
<body>
<table border="1" cellspacing="0" cellpadding="0"><tr><td height="30" align="right" valign="middle" scope="col">使用fgets函数：</td><td height="30" align="center" valign="middle" scope="col">
<?php$fopen = fopen('fun.php','rb');while(!feof($fopen)){echo fgets($fopen);}fclose($fopen);
?>   </td></tr><tr><td height="30" align="right" valign="middle">使用fgetss函数：</td><td height="30" align="center" valign="middle"><?php$fopen = fopen('fun.php','rb');while(!feof($fopen)){echo fgetss($fopen);}fclose($fopen);
?>   </td></tr>
</table>
</body>
</html>

读取一个字符：fgetc() 读取任意长度的字串：fread()

string fgetc ( resource handle )<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>使用fgetc函数读取字符</title>
<style type="text/css">
<!--
body,td,th {font-size: 12px;
}
body {margin-left: 10px;margin-top: 10px;margin-right: 10px;margin-bottom: 10px;
}
-->
</style></head>
<body>
<pre>
<?php$fopen = fopen('03.txt','rb');while(false !== ($chr = fgetc($fopen))){echo $chr;}fclose($fopen);
?>
</pre>
</body>
</html>string fread ( int handle, int length )<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>使用fread函数读取文件</title>
<style type="text/css">
<!--
body,td,th {font-size: 12px;
}
body {margin-left: 10px;margin-top: 10px;margin-right: 10px;margin-bottom: 10px;
}
-->
</style></head>
<body>
<?php$filename = "04.txt";$fp = fopen($filename,"rb");echo fread($fp,32);echo "<p>";echo fread($fp,filesize($filename));
?>
</body>
</html>

写入文件

使用fwrite()和file_put_contents()函数向文件中写入数据

fwrite()函数

int fwrite ( resource handle, string string [, int length] )

file_put_contents()函数

int file_put_contents ( string filename, string data [, int
flags])

使用fwrite和file_put_contents函数写入数据

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>使用fwrite和file_put_contents函数写入数据</title>
<style type="text/css">
<!--
body,td,th {font-size: 12px;
}
body {margin-left: 10px;margin-top: 10px;margin-right: 10px;margin-bottom: 10px;
}
-->
</style></head>
<body>
<?php$filepath = "05.txt";$str = "此情可待成追忆   只是当时已惘然<br>";echo "用fwrite写入文件：";$fopen = fopen($filepath,'wb') or die('文件不存在');fwrite($fopen,$str);fclose($fopen);readfile($filepath);echo "<p>用file_put_contents写入文件：";file_put_contents($filepath,$str);readfile($filepath);
?>
</body>
</html>

操作文件

bool copy();
bool rename();
bool unlink();
int fileatime();
int filemtime();
int filesize();
array pathinfo();
string realpath();

目录处理

opendir()函数

resource opendir ( string path)

closedir()函数

void closedir ( resource handle )

案例：

<?php
$path = "D:\\55555\\www\\55\\55\\12" ;
if (is_dir($path)){                     //检测是否是一个目录if ($dire = opendir($path))             //判断打开目录是否成功echo $dire;                 //输出目录指针
}else{echo '路径错误';exit();
}
…                                   //其他操作
closedir($dire);                            //关闭目录
?>

浏览目录，scandir()函数

array scandir ( string directory [, int sorting_order ])

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>浏览目录</title>
<style type="text/css">
<!--
body,td,th {font-size: 12px;
}
body {margin-left: 10px;margin-top: 10px;margin-right: 10px;margin-bottom: 10px;
}
-->
</style></head>
<body>
<?php  $path = 'E:\AppServ\www\mr\sl\13';if(is_dir($path)){$dir = scandir($path);foreach($dir as $value){echo $value."<br>";}}else{echo "目录路径错误！";}
?>
</body>
</html>

操作目录

bool mkdir
bool rmdir
string getcwd
bool chdir
float disk_free_space
string readdir
void rewinddir

高级应用
远程文件访问
文件指针
锁定文件

php.ini中配置,找到allow_url_fopen,设为ON

fopen('http://127.0.0.1/index.php','rb');

文件指针

1．rewind()函数

bool rewind ( resource handle )

2．fseek()函数

int fseek ( resource handle, int offset [, int whence] )

handle参数为要打开的文件
offset为指针位置或相对whence参数的偏移量，可以是负值
whence的值包括3种：
SEEK_SET，位置等于offset字节
SEEK_CUR，位置等于当前位置加上offset字节
SEEK_END，位置等于文件尾加上offset字节
如果忽略whence参数，系统默认为SEEK_SET

3．feof()函数

bool feof ( resource handle )

4．ftell()函数

int ftell ( resource handle )

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>文件指针函数</title>
<style type="text/css">
<!--
body,td,th {font-size: 12px;
}
body {margin-left: 10px;margin-top: 10px;margin-right: 10px;margin-bottom: 10px;
}
-->
</style></head>
<body>
<?php
$filename = "07.txt";
$total = filesize($filename);
if(is_file($filename)){echo "文件总字节数：".$total."<br>";$fopen = fopen($filename,'rb');echo "初始指针位置是：".ftell($fopen)."<br>";fseek($fopen,33);echo "使用fseek()函数后指针位置：".ftell($fopen)."<br>";echo "输出当前指针后面的内容：".fgets($fopen)."<br>";if(feof($fopen))echo "当前指针指向文件末尾：".ftell($fopen)."<br>";rewind($fopen);echo "使用rewind()函数后指针的位置：".ftell($fopen)."<br>";echo "输出前33字节的内容：".fgets($fopen,33);fclose($fopen);
}else{echo "文件不存在";
}
?>
</body>
</html>

锁定文件

bool flock ( int handle, int operation)LOCK_SH取得共享锁定（读取程序）
LOCK_EX取得独占锁定（写入程序）
LOCK_UN释放锁定
LOCK_NB防止flock()在锁定时堵塞
operation的参数

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>使用flock函数</title>
</head>
<body>
<?php$filename = '08.txt';                        //声明要打开的文件的名称$fd = fopen($filename,'w');                 //以w形式打开文件flock($fd, LOCK_EX);                      //锁定文件（毒针共享fwrite($fd, "hightman1");                   //向文件中写入数据flock($fd, LOCK_UN);                      //解除锁定fclose($fd);                              //关闭文件指针readfile($filename);                        //输出文件内容
?>
</body>
</html>

文件上传

文件上传是要通过http协议来实现的，要在php.ini文件中进行对上传文件的设置，要了解$_FILES变量和函数move_uploaded_file()函数实现上传。

要配置php.ini文件，在文件中找到file_uploads，如果值为on，说明服务器支持文件上传，如果为off，则表示不支持，upload_tmp_dir为上传文件临时位置，系统默认，也可以自己定。

upload_max_filesize为服务器允许上传的文件的最大值，默认2mb。max_execution_timePHP中一个指令所能执行的最大时间，memory_limitPHP中一个指令所分配的内存空间。

$_FILES[filename][name]
上传文件的文件名$_FILES[filename][size]
文件大小$_FILES[filename][tmp_name]
为临时文件名$_FILES[filename][type]
文件的类型$_FILES[filename][error]
上传文件的结果。如果返回0，说明文件上传成功

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>$_FIELS变量</title>
<style type="text/css">
<!--
body,td,th {font-size: 12px;
}
body {margin-left: 10px;margin-top: 10px;margin-right: 10px;margin-bottom: 10px;
}
-->
</style></head>
<body>
<table width="500" border="0" cellspacing="0" cellpadding="0">
<form action="" method="post" enctype="multipart/form-data"><tr><td width="150" height="30" align="right" valign="middle">请选择上传文件：</td><td width="250"><input type="file" name="upfile"/></td><td width="100"><input type="submit" name="submit" value="上传" /></td></tr>
</form>
</table>
<?phpif(!empty($_FILES)){foreach($_FILES['upfile'] as $name => $value)echo $name.' = '.$value.'<br>';}
?>
</body>
</html>

文件上传函数

move_uploaded_file()函数上传文件

bool move_uploaded_file ( string filename, string destination )

将上传文件存储到指定的位置

单文件上传

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>单文件上传</title>
<style type="text/css">
<!--
body,td,th {font-size: 12px;
}
body {margin-left: 10px;margin-top: 10px;margin-right: 10px;margin-bottom: 10px;
}
-->
</style></head>
<body>
<?phpif(!empty($_FILES[up_file][name])){$fileinfo = $_FILES[up_file];if($fileinfo['size'] < 1000000 && $fileinfo['size'] > 0){move_uploaded_file($fileinfo['tmp_name'],$fileinfo['name']);echo '上传成功';}else{echo '文件太大或未知';}}
?>
<table width="385" height="185" border="0" cellpadding="0" cellspacing="0" background="images/bg.JPG"><tr><td width="142" height="80">&nbsp;</td><td width="174">&nbsp;</td><td width="69">&nbsp;</td></tr>
<form action="" method="post" enctype="multipart/form-data" name="form"><tr><td height="30">&nbsp;</td><td align="left" valign="middle"><input name="up_file" type="file" size="12" /></td><td>&nbsp;</td></tr><tr><td height="27" align="right">&nbsp;</td><td align="center" valign="top">&nbsp;&nbsp;<input type="image" name="imageField" src="data:images/fg.bmp"></td><td>&nbsp;</td></tr></form><tr><td height="48">&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
</table></body>
</html>

多文件上传

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>多文件上传</title>
<style type="text/css">
<!--
body,td,th {font-size: 12px;
}
body {margin-left: 10px;margin-top: 10px;margin-right: 10px;margin-bottom: 10px;
}
-->
</style>
</head>
<body>
请选择要上传的文件
<form action="" method="post" enctype="multipart/form-data"><table border="1" cellpadding="1" cellspacing="1" bordercolor="#FFFFFF" bgcolor="#CCCCCC" id="up_table" ><tbody id="auto"><tr id="show" ><td bgcolor="#FFFFFF">上传文件 </td><td bgcolor="#FFFFFF"><input name="u_file[]" type="file"></td></tr><tr><td bgcolor="#FFFFFF">上传文件 </td><td bgcolor="#FFFFFF"><input name="u_file[]" type="file"></td></tr><tr><td bgcolor="#FFFFFF">上传文件 </td><td bgcolor="#FFFFFF"><input name="u_file[]" type="file"></td></tr><tr><td bgcolor="#FFFFFF">上传文件 </td><td bgcolor="#FFFFFF"><input name="u_file[]" type="file"></td></tr></tbody><tr><td colspan="4" bgcolor="#FFFFFF"><input type="submit" value="上传" /></td></tr></table>
</form>
<?php
if(!empty($_FILES[u_file][name])){$file_name = $_FILES[u_file][name];$file_tmp_name = $_FILES[u_file][tmp_name];for($i = 0; $i < count($file_name); $i++){if($file_name[$i] != ''){move_uploaded_file($file_tmp_name[$i],$i.$file_name[$i]);echo '文件'.$file_name[$i].'上传成功。更名为'.$i.$file_name[$i].'<br>';}}
}
?>
</body>
</html>

访问量：

<?php session_start();
if($_SESSION[temp]==""){ //判断$_SESSION[temp]==""的值是否为空,其中的temp为自定义的变量if(($fp=fopen("counter.txt","r"))==false){ echo "打开文件失败!";}else{ $counter=fgets($fp,1024);       //读取文件中数据fclose($fp);                    //关闭文本文件$counter++;                     //计数器增加1$fp=fopen("counter.txt","w");   //以写的方式打开文本文件<!---->fputs($fp,$counter);            //将新的统计数据增加1fclose($fp);    }                                 //关闭文   $_SESSION[temp]=1;                     //登录以后,$_SESSION[temp]的值不为空,给$_SESSION[temp]赋一个值1
}
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>通过文本文件统计页面访问量</title>
</head>
<body>
<img src="gd1.php" />
</BODY>
</HTML><?php
//以图形的形式输出数据库中的记录数if(($fp=fopen("counter.txt","r"))==false){echo "打开文件失败!";
}else{$counter=fgets($fp,1024);fclose($fp);//通过GD2函数创建画布$im=imagecreate(240,24);$gray=imagecolorallocate($im,255,255,255);$color =imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));    //定义字体颜色//输出中文字符$text=iconv("gb2312","utf-8","网站的访问量:");                           //对指定的中文字符串进行转换$font = "Fonts/FZHCJW.TTF";  imagettftext($im,14,0,20,18,$color,$font,$text);                         //输出中文//输出网站的访问次数imagestring($im,5,160,5,$counter,$color);imagepng($im);imagedestroy($im);
}   ?>

限制大小的文件上传

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>限制大小的文件上传</title>
<style type="text/css">
<!--
body {margin-left: 00px;margin-top: 0px;margin-right: 0px;margin-bottom: 0px;
}
-->
</style></head><body>
<table width="385" height="185" border="0" cellpadding="0" cellspacing="0" background="images/bg.JPG"><tr><td width="142" height="80">&nbsp;</td><td width="174">&nbsp;</td><td width="69">&nbsp;</td></tr><form name="form1" method="post" action="index_ok.php" enctype="multipart/form-data"><tr><td height="30">&nbsp;</td><td align="left" valign="middle"><input name="files" type="file" id="files" size="13" maxlength="150">   </td><td>&nbsp;</td></tr><tr><td height="27" align="right">&nbsp;</td><td align="center" valign="top">&nbsp;&nbsp;<input type="image" name="imageField" src="data:images/fg.bmp"></td><td>&nbsp;</td></tr></form><tr><td height="48">&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>
</table>
</body>
</html><?php if($_FILES['files']['name']==true){$filesize=$_FILES['files']['size'];if($filesize>1000000){echo "对不起,您上传的文件超过规定的大小!!";echo "<meta http-equiv=\"Refresh\" content=\"3;url=index.php\">将在3秒钟后返回前页...";}else{$path = './upfiles/'. $_FILES['files']['name'];if (move_uploaded_file($_FILES['files']['tmp_name'],$path)) { echo "上传成功!!";echo "<meta http-equiv=\"Refresh\" content=\"3;url=index.php\">"; }else{echo "文件上传失败!!";echo "<meta http-equiv=\"Refresh\" content=\"3;url=index.php\">";}}}
?>

结言

好了，欢迎在留言区留言，与大家分享你的经验和心得。

感谢你学习今天的内容，如果你觉得这篇文章对你有帮助的话，也欢迎把它分享给更多的朋友，感谢。

感谢！承蒙关照！您真诚的赞赏是我前进的最大动力！