使用PHP QR Code类库创建二维码，分享给大家。

使用浏览器输出：

<?
include "phpqrcode/phpqrcode.php";
$value="http://www.";
$errorCorrectionLevel = "L";
$matrixPointSize = "4";
QRcode::png($value, false, $errorCorrectionLevel, $matrixPointSize);
exit;
?>

文件输出二维码：

<?php
include('phpqrcode/phpqrcode.php'); 
// 二维码数据 
$data = 'http://s.bookphone.cn'; 
// 生成的文件名 
$filename = '1111.png'; 
// 纠错级别：L、M、Q、H 
$errorCorrectionLevel = 'L'; 
// 点的大小：1到10 
$matrixPointSize = 4; 
QRcode::png($data, $filename, $errorCorrectionLevel, $matrixPointSize, 2);
?>

生成中间带logo的二维码：

<?php
//带中间logo的二维码
//by www.
include('phpqrcode/phpqrcode.php'); 
$value='http://www.';
$errorCorrectionLevel = 'L';
$matrixPointSize = 6;
QRcode::png($value, 'xxx.png', $errorCorrectionLevel, $matrixPointSize, 2);
echo "QR code generated"."<br />";
$logo = 'logo.png';
$QR = 'xxx.png';

if($logo !== FALSE)
{

$QR = imagecreatefromstring(file_get_contents($QR));
$logo = imagecreatefromstring(file_get_contents($logo));
$QR_width = imagesx($QR);
$QR_height = imagesy($QR);
$logo_width = imagesx($logo);
$logo_height = imagesy($logo);
$logo_qr_width = $QR_width / 5;
$scale = $logo_width / $logo_qr_width;
$logo_qr_height = $logo_height / $scale;
$from_width = ($QR_width - $logo_qr_width) / 2;
imagecopyresampled($QR, $logo, $from_width, $from_width, 0, 0, $logo_qr_width, $logo_qr_height, $logo_width, $logo_height);
}
imagepng($QR,'xxx_log.png');
?>

php发送与接受http自动请求，使用socket操作，http自定义herader。;

1，文件 1.php

<?php
$A=trim(urlencode('aaaa'));
$B=trim(urlencode('bbbb'));
$C=trim(urlencode('ccccc'));
$params = "Content-A=$A&Content-B=$B&Content-C=$C";

$length = strlen($params);
$fp = fsockopen("localhost",80,$errno,$errstr,10) or exit($errstr."--->".$errno);
$header  = "POST /2.php HTTP/1.1\r\n";//一般有post, get这两种 
$header .= "Host:localhost\r\n"; 
$header .= "Referer:1.php\r\n"; 
$header .= "Content-Type: application/x-www-form-urlencoded\r\n"; 
$header .= "Content-Length: ".$length."\r\n"; 
$header .= "Connection: Close\r\n\r\n"; 
$header .= $params."\r\n";

fputs($fp,$header);
$inheader = 1; 
    while (!feof($fp)) { 
        $line = fgets($fp,1024); //去除请求包的头只显示页面的返回数据 
        if ($inheader && ($line == "\n" || $line == "\r\n")) { 
             $inheader = 0; 
        } 
        if ($inheader == 0) { 
          echo $line; 
        } 
    } 
 
fclose($fp); 
//by www. 
?>

2，文件 2.php

<?php
echo "this is the data posted"; 
echo "<pre>"; 
print_r($_REQUEST); 
echo "</pre>";

foreach (getallheaders() as $name => $value) {
    echo "$name: $value\n";
}
/*function GetHeaderInfo(){ 
    foreach ($_SERVER as $name => $value){
        $headers[$name] = $value; 
    } 
    return $headers; 
}
var_dump(GetHeaderInfo());*/
?>

代码：

<?php
//显示与释放内存
//以下数字取决于linux系统类型与版本
 
echo memory_get_usage() . "\n"; // 36640
 
$a = str_repeat("Hello", 4242);
 
echo memory_get_usage() . "\n"; // 57960
 
unset($a);
 
echo memory_get_usage() . "\n"; // 36744
?>