使用到三个文件connect.php：连接数据库用

test_upload.php：执行SQL语句用

upload_img.php：上传图片并压缩用

三个文件代码如下：

connect.php<?php $db_host = '';

$db_user = '';

$db_psw = '';

$db_name = '';

$db_port = '';

$sqlconn=new mysqli($db_host,$db_user,$db_psw,$db_name);

$q="set names utf8;";

$result=$sqlconn->query($q);if (mysqli_connect_errno()) {

printf("Connect failed: %s\n", mysqli_connect_error());exit();

}?>

test_upload.php<?phprequire  ("connect.php");require ("upload_img.php");

$real_img=$uploadfile;

$small_img=$uploadfile_resize;

$insert_sql = "insert into img (real_img,small_img) values (?,?)";

$result = $sqlconn -> prepare($insert_sql);

$result -> bind_param("ss", $real_img,$small_img);

$result -> execute();?>

upload_img.php<?php  //设置文件保存目录$uploaddir = "upfiles/"; //设置允许上传文件的类型$type=array("jpg","gif","bmp","jpeg","png"); //获取文件后缀名函数 function fileext($filename) {

return substr(strrchr($filename, '.'), 1);

} //生成随机文件名函数 function random($length) {

$hash = 'CR-';

$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz';

$max = strlen($chars) - 1;

mt_srand((double)microtime() * 1000000);

for($i = 0; $i

{

$hash .= $chars[mt_rand(0, $max)];

}

return $hash;

}

$a=strtolower(fileext($_FILES['filename']['name'])); //判断文件类型 if(!in_array(strtolower(fileext($_FILES['filename']['name'])),$type))

{

$text=implode(",",$type);

$ret_code=3;//文件类型错误    $page_result=$text;

$retArray = array('ret_code' => $ret_code,'page_result'=>$page_result);

$retJson = json_encode($retArray);

echo $retJson;

return;

} //生成目标文件的文件名 else{

$filename=explode(".",$_FILES['filename']['name']);

do

{

$filename[0]=random(10); //设置随机数长度         $name=implode(".",$filename);

//$name1=$name.".Mcncc";         $uploadfile=$uploaddir.$name;

}

while(file_exists($uploadfile));

if (move_uploaded_file($_FILES['filename']['tmp_name'],$uploadfile))

{

if(is_uploaded_file($_FILES['filename']['tmp_name']))

{

$ret_code=1;//上传失败        }

else

{//上传成功        $ret_code=0;

}

}

$retArray = array('ret_code' => $ret_code);

$retJson = json_encode($retArray);echo $retJson;

}//压缩图片$uploaddir_resize="upfiles_resize/";

$uploadfile_resize=$uploaddir_resize.$name;//$pic_width_max=120;//$pic_height_max=90;//以上与下面段注释可以联合使用，可以使图片根据计算出来的比例压缩$file_type=$_FILES["filename"]['type'];function ResizeImage($uploadfile,$maxwidth,$maxheight,$name){

//取得当前图片大小    $width = imagesx($uploadfile);

$height = imagesy($uploadfile);

$i=0.5;

//生成缩略图的大小    if(($width > $maxwidth) || ($height > $maxheight))

{

/*

$widthratio = $maxwidth/$width;

$heightratio = $maxheight/$height;

if($widthratio

{

$ratio = $widthratio;

}

else

{

$ratio = $heightratio;

}

$newwidth = $width * $ratio;

$newheight = $height * $ratio;

*/        $newwidth = $width * $i;

$newheight = $height * $i;

if(function_exists("imagecopyresampled"))

{

$uploaddir_resize = imagecreatetruecolor($newwidth, $newheight);

imagecopyresampled($uploaddir_resize, $uploadfile, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

}

else        {

$uploaddir_resize = imagecreate($newwidth, $newheight);

imagecopyresized($uploaddir_resize, $uploadfile, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

}

ImageJpeg ($uploaddir_resize,$name);

ImageDestroy ($uploaddir_resize);

}

else    {

ImageJpeg ($uploadfile,$name);

}

}if($_FILES["filename"]['size'])

{

if($file_type == "image/pjpeg"||$file_type == "image/jpg"|$file_type == "image/jpeg")

{

//$im = imagecreatefromjpeg($_FILES[$upload_input_name]['tmp_name']);

$im = imagecreatefromjpeg($uploadfile);

}

elseif($file_type == "image/x-png")

{

//$im = imagecreatefrompng($_FILES[$upload_input_name]['tmp_name']);

$im = imagecreatefromjpeg($uploadfile);

}

elseif($file_type == "image/gif")

{

//$im = imagecreatefromgif($_FILES[$upload_input_name]['tmp_name']);

$im = imagecreatefromjpeg($uploadfile);

}

else//默认jpg    {

$im = imagecreatefromjpeg($uploadfile);

}

if($im)

{

ResizeImage($im,$pic_width_max,$pic_height_max,$uploadfile_resize);

ImageDestroy ($im);

}

} ?>