这篇文章主要介绍了php生成图片验证码功能,结合实例形式简单介绍了php生成验证码图片的操作技巧,具有一定参考借鉴价值,需要的朋友可以参考下
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
/**
* 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,255,255,100);
$color=imagecolorallocate($imgres,0,0,0);
for($i=0;$i<$validatelength;$i++){
$rand=rand(1,58);
$strtodraw=$strtodraw." ".$chars[$rand];
}
imagestring($imgres,5,0,5,$strtodraw,$color);
for($i=0;$i<100;$i++){
imagesetpixel($imgres,rand(0,$imgw),rand(0,$imgh),$color);
}
imagepng($imgres);
imagedestroy($imgres);
运行效果如下：
以上就是本文的全部内容，希望对大家的学习有所帮助。
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以上就是php生成图片验证码功能详解的详细内容。