php生成验证码的函数,实用靠谱。先上下生成的验证码的效果图(这里生成的是全数字的验证码的示例效果):
下面是php生成验证码的源码:
<?php session_start(); //session_register('CheckCode'); //PHP4.2以上版本不需要用session_register()注册SESSION变量 $type='gif'; $width= 45; $height= 20; header("Content-type: image/".$type); srand((double)microtime()*1000000); if(isset($_GET['action'])){ $randval=randStr(4,$_GET['action']); }else{ $randval=randStr(4,''); } if($type!='gif'&&function_exists('imagecreatetruecolor')){ $im=@imagecreatetruecolor($width,$height); }else{ $im=@imagecreate($width,$height); } $r=Array(225,211,255,223); $g=Array(225,236,237,215); $b=Array(225,236,166,125); $key=rand(0,3); $backColor=ImageColorAllocate($im,$r[$key],$g[$key],$b[$key]);//背景色(随机) $borderColor=ImageColorAllocate($im,127,157,185);//边框色 $pointColor=ImageColorAllocate($im,255,170,255);//点颜色 @imagefilledrectangle($im,0,0,$width - 1,$height - 1,$backColor);//背景位置 @imagerectangle($im,0,0,$width-1,$height-1,$borderColor); //边框位置 $stringColor=ImageColorAllocate($im,255,51,153); for($i=0;$i<=100;$i++){ $pointX=rand(2,$width-2); $pointY=rand(2,$height-2); @imagesetpixel($im,$pointX,$pointY,$pointColor); } @imagestring($im,5,5,1,$randval,$stringColor); $ImageFun='Image'.$type; $ImageFun($im); @imagedestroy($im); $_SESSION['CheckCode']=$randval; function randStr($len=6,$format='ALL'){ switch($format){ case 'ALL'://生成包含数字和字母的验证码 $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'; break; case 'CHAR'://仅生成包含字母的验证码 $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'; break; case 'NUMBER'://仅生成包含数字的验证码 $chars='0123456789'; break; default : $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'; break; } $string=''; while(strlen($string)<$len) $string.=substr($chars,(mt_rand()%strlen($chars)),1); return $string; }
该函数的具体使用方法请看如下这个示例(这里是生成全数字的验证码):
<img src="/static/imghwm/default1.png" data-src="checkCode.php?action=NUMBER" class="lazy" style="max-width:90%" style="max-width:90%" / alt="php生成验证码函数_PHP" >
以上就是php如何生成验证码的实现函数,希望对大家的学习有所帮助。

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