PHP学习总结（二）

上接PHP学习总结（一）

http://blog.csdn.net/kemy88/archive/2007/03/15/1530767.aspx

14。PHP+MYSQL分页代码

分页的思想：最主要是两点，一个是每页显示的个数，另一个是当前显示第几页

<?php
$conn=mysql_connect("localhost","root","kemy88");
//设定每一页显示的记录数
$pagesize=1;
mysql_select_db("shop",$conn);
//取得记录总数$rs，计算总页数用
$rs=mysql_query("select count(*) from type ",$conn);
$myrow = mysql_fetch_array($rs);
$numrows=$myrow[0];
//计算总页数
$pages=intval($numrows/$pagesize);
if($numrows%$pagesize){
$pages++;
}
//设置页数
if (isset($_GET['page'])){
$page=intval($_GET['page']);
}
else{
//设置为第一页
$page=1;
}
//计算记录偏移量
$offset=$pagesize*($page - 1);
//读取指定记录数
$rs=mysql_query("select * from type order by id desc limit $offset,$pagesize",$conn);
?>
<table border="0" width="80%">
<tr><td width="50%" bgcolor="#E0E0E0">
ID</td><td width="50%" bgcolor="#E0E0E0">NAME</td></tr>
<?php
while($myrow = mysql_fetch_array($rs)){
?>
<tr><td width="50%"><?php echo $myrow["id"];?></td><td width="50%"><?php echo $myrow["cn"];?></td></tr>
<?php
}
echo "</table>";
echo "<div align=/"center/">共有".$pages."页(".$page."/".$pages.")</div>";
$first=1;
$prev=$page-1;
$next=$page+1;
$last=$pages;
if($page>1){
echo "<a href=/"page.php?page=".$first."/">首页</a> ";
echo " <a href=/"page.php?page=".$prev."/">上一页</a> ";
}
if($page<$pages){
echo " <a href=/"page.php?page=".$next."/">下一页</a> ";
echo " <a href=/"page.php?page=".$last."/">尾页</a> ";
}
?>

15。PHP的SMTP发邮件类

<?php
class smtp

{

/* Public Variables */

var $smtp_port;

var $time_out;

var $host_name;

var $log_file;

var $relay_host;

var $debug;

var $auth;

var $user;

var $pass;

/* Private Variables */
var $sock;

/* Constractor */

function smtp($relay_host = "", $smtp_port = 25,$auth = false,$user,$pass)

{

$this->debug = FALSE;

$this->smtp_port = $smtp_port;

$this->relay_host = $relay_host;

$this->time_out = 30; //is used in fsockopen()
#

$this->auth = $auth;//auth

$this->user = $user;

$this->pass = $pass;

$this->host_name = "localhost"; //is used in HELO command
$this->log_file = "";

$this->sock = FALSE;

}

/* Main Function */

function sendmail($to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = "")

{

$mail_from = $this->get_address($this->strip_comment($from));

$body = ereg_replace("(^|(/r/n))(/.)", "/1./3", $body);

$header .= "MIME-Version:1.0/r/n";

if($mailtype=="HTML"){

$header .= "Content-Type:text/html charset=utf-8/r/n";

}else if($mailtype=="TXT"){

$header .= "Content-Type:text/plain charset=utf-8/r/n";

}

$header .= "To: ".$to."/r/n";

if ($cc != "") {

$header .= "Cc: ".$cc."/r/n";

}

$header .= "From: $from<".$from.">/r/n";

$header .= "Subject: ".$subject."/r/n";

$header .= $additional_headers;

$header .= "Date: ".date("r")."/r/n";

$header .= "X-Mailer:By Redhat (PHP/".phpversion().")/r/n";

list($msec, $sec) = explode(" ", microtime());

$header .= "Message-ID: <".date("YmdHis", $sec).".".($msec*1000000).".".$mail_from.">/r/n";

$TO = explode(",", $this->strip_comment($to));

if ($cc != "") {

$TO = array_merge($TO, explode(",", $this->strip_comment($cc)));

}

if ($bcc != "") {

$TO = array_merge($TO, explode(",", $this->strip_comment($bcc)));

}

$sent = TRUE;

foreach ($TO as $rcpt_to) {

$rcpt_to = $this->get_address($rcpt_to);

if (!$this->smtp_sockopen($rcpt_to)) {

$this->log_write("Error: Cannot send email to ".$rcpt_to."/n");

$sent = FALSE;

continue;

}

if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) {

$this->log_write("E-mail has been sent to <".$rcpt_to.">/n");

} else {

$this->log_write("Error: Cannot send email to <".$rcpt_to.">/n");

$sent = FALSE;

}

fclose($this->sock);

$this->log_write("Disconnected from remote host/n");

}

return $sent;

}

/* Private Functions */

function smtp_send($helo, $from, $to, $header, $body = "")

{

if (!$this->smtp_putcmd("HELO", $helo)) {

return $this->smtp_error("sending HELO command");

}

#auth

if($this->auth){

if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))) {

return $this->smtp_error("sending HELO command");

}

if (!$this->smtp_putcmd("", base64_encode($this->pass))) {

return $this->smtp_error("sending HELO command");

}

if (!$this->smtp_putcmd("MAIL", "FROM:<".$from.">")) {

return $this->smtp_error("sending MAIL FROM command");

}

if (!$this->smtp_putcmd("RCPT", "TO:<".$to.">")) {

return $this->smtp_error("sending RCPT TO command");

}

if (!$this->smtp_putcmd("DATA")) {

return $this->smtp_error("sending DATA command");

}

if (!$this->smtp_message($header, $body)) {

return $this->smtp_error("sending message");

}

if (!$this->smtp_eom()) {

return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]");

}

if (!$this->smtp_putcmd("QUIT")) {

return $this->smtp_error("sending QUIT command");

}

return TRUE;

}

function smtp_sockopen($address)

{

if ($this->relay_host == "") {

return $this->smtp_sockopen_mx($address);

} else {

return $this->smtp_sockopen_relay();

}

function smtp_sockopen_relay()

{

$this->log_write("Trying to ".$this->relay_host.":".$this->smtp_port."/n");

$this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out);

if (!($this->sock && $this->smtp_ok())) {

$this->log_write("Error: Cannot connenct to relay host ".$this->relay_host."/n");

$this->log_write("Error: ".$errstr." (".$errno.")/n");

return FALSE;

}

$this->log_write("Connected to relay host ".$this->relay_host."/n");

return TRUE;;

}

function smtp_sockopen_mx($address)

{

$domain = ereg_replace("^.+@([^@]+)$", "/1", $address);

if (!@getmxrr($domain, $MXHOSTS)) {

$this->log_write("Error: Cannot resolve MX /"".$domain."/"/n");

return FALSE;

}

foreach ($MXHOSTS as $host) {

$this->log_write("Trying to ".$host.":".$this->smtp_port."/n");

$this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out);

if (!($this->sock && $this->smtp_ok())) {

$this->log_write("Warning: Cannot connect to mx host ".$host."/n");

$this->log_write("Error: ".$errstr." (".$errno.")/n");

continue;

}

$this->log_write("Connected to mx host ".$host."/n");

return TRUE;

}

$this->log_write("Error: Cannot connect to any mx hosts (".implode(", ", $MXHOSTS).")/n");

return FALSE;

}

function smtp_message($header, $body)

{

fputs($this->sock, $header."/r/n".$body);

$this->smtp_debug("> ".str_replace("/r/n", "/n"."> ", $header."/n> ".$body."/n> "));

return TRUE;

}

function smtp_eom()

{

fputs($this->sock, "/r/n./r/n");

$this->smtp_debug(". [EOM]/n");

return $this->smtp_ok();

}

function smtp_ok()

{

$response = str_replace("/r/n", "", fgets($this->sock, 512));

$this->smtp_debug($response."/n");

if (!ereg("^[23]", $response)) {

fputs($this->sock, "QUIT/r/n");

fgets($this->sock, 512);

$this->log_write("Error: Remote host returned /"".$response."/"/n");

return FALSE;

}

return TRUE;

}

function smtp_putcmd($cmd, $arg = "")

{

if ($arg != "") {

if($cmd=="") $cmd = $arg;

else $cmd = $cmd." ".$arg;

}

fputs($this->sock, $cmd."/r/n");

$this->smtp_debug("> ".$cmd."/n");

return $this->smtp_ok();

}

function smtp_error($string)

{

$this->log_write("Error: Error occurred while ".$string."./n");

return FALSE;

}

function log_write($message)

{

$this->smtp_debug($message);

if ($this->log_file == "") {

return TRUE;

}

$message = date("M d H:i:s ").get_current_user()."[".getmypid()."]: ".$message;

if (!@file_exists($this->log_file) || !($fp = @fopen($this->log_file, "a"))) {

$this->smtp_debug("Warning: Cannot open log file /"".$this->log_file."/"/n");

return FALSE;;

}

flock($fp, LOCK_EX);

fputs($fp, $message);

fclose($fp);

return TRUE;

}

function strip_comment($address)

{

$comment = "/([^()]*/)";

while (ereg($comment, $address)) {

$address = ereg_replace($comment, "", $address);

}

return $address;

}

function get_address($address)

{

$address = ereg_replace("([ /t/r/n])+", "", $address);

$address = ereg_replace("^.*<(.+)>.*$", "/1", $address);

return $address;

}

function smtp_debug($message)

{

if ($this->debug) {

echo $message;

}

$smtp = new smtp($smtpserver,$smtpserverport,true,$smtpuser,$smtppass);
$smtp->sendmail(...);

16。PHP登陆验证码
其主要是利用imagecreate函数

<?php
session_start();
Header("Content-type: image/PNG");
$tmpstring="ABCDEFGHJKLMNPQRSTUVWXYZ";
$authnum="";
for($i=0;$i<4;$i++){
$randnum=rand(0,23);
$authnum.=$tmpstring{$randnum};
}
$_SESSION["VerifyCode"]=$authnum;
$im = imagecreate(58,20);
$white = ImageColorAllocate($im, 255,255,255);
$gray = ImageColorAllocate($im, 255,255,246);
$black = ImageColorAllocate($im, 0,0,0);
imagefill($im,57,19,$gray);
imagestring($im, 5, 10,3, $authnum, $black);
for($i=0;$i<30;$i++){
imagesetpixel($im, rand(3,55) , rand(2,19) , $black);
}
ImagePNG($im);
ImageDestroy($im);
?>

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