PHP生成图片验证码功能示例

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本文实例讲述了PHP生成图片验证码功能。分享给大家供大家参考，具体如下：

只是简单的用随机函数实现了图片的生成，没有对验证的整个流程做介绍。

代码如下：

php;">
<>PHP
/**
 * Created by jetBrains PHPStorm.
 * User: lee
 * To change this template use File | SetTings | File Templates.
 */
header("content-type:image/png");
$validateLength=4;
$strToDraw="";
$chars=[
  "0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"
];
$imgW=80;
$imgH=25;
$imgRes=imagecreate($imgW,$imgH);
$imgColor=imagecolorallocate($imgRes,255,100);
$color=imagecolorallocate($imgRes,0);
for($i=0;$i<$validatelength;$i++){ $rand="rand(1,58);" $strtodraw="$strToDraw."" ".$chars[$rand];="" }="" imagestring($imgres,5,$strtodraw,$color);="" for($i=""><100;$i++){ imagesetpixel($imgres,rand(0,$imgw),$imgh),$color);="" }="" imagepng($imgres);="" imagedestroy($imgres);="">

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