Rumah >pembangunan bahagian belakang >tutorial php >PHP生成图片验证码功能详解
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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