PHP Chinese verification code implementation method, _PHP tutorial

How to implement PHP Chinese verification code,

The example in this article describes how to implement PHP Chinese verification code. Share it with everyone for your reference. The specific analysis is as follows:

Look at the following renderings first:

The specific code is as follows:

<&#63;php
/*********************************
* Code by Gently
* 24/07/07
*严正声明：验证码为程序随机生成，“某种巧合”的词语组合属于正常现象
，
*某些别有用心的人不要借题发挥！
*Power by ZendStudio.Net
*********************************/
session_start();
header("Content-type: image/PNG");
$w=180;
$h=60;
$fontface="C:\WINDOWS\Fonts\MSYH.TTF"; //字体文件
$str = "们以我到他会作时要动国产的一是工就年阶义发成部民可出能方进在
了不和有大这主中人上为来分生对于学下级地个用同行面说种过命度革而多子
后自社加小机也经力线本电高量长党得实家定深法表着水理化争现所二起政三
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批点育重其思与间内去因件日利相由压员气业代全组数果期导平各基或月毛然
如应形想制心样干都向变关问比展那它最及外没看治提五解系林者米群头意只
明四道马认次文通但条较克又公孔领军流入接席位情运器并飞原油放立题质指
建区验活众很教决特此常石强极土少已根共直团统式转别造切九你取西持总料
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航衣孙龄岭骗休借";
$code="";
for($i=0;$i<4;$i++){
    $Xi=mt_rand(0,strlen($str)/2);
    if($Xi%2) $Xi+=1;
    $code.=substr($str,$Xi,2);
}
$_SESSION['code']=$code;
$im=imagecreatetruecolor($w,$h);
$bkcolor=imagecolorallocate($im,250,250,250);
imagefill($im,0,0,$bkcolor);
/***添加干扰***/
for($i=0;$i<15;$i++){
    $fontcolor=imagecolorallocate($im,mt_rand(0,255),mt_rand
(0,255),mt_rand(0,255));
    imagearc($im,mt_rand(-10,$w),mt_rand(-10,$h),mt_rand
(30,300),mt_rand(20,200),55,44,$fontcolor);
}
for($i=0;$i<255;$i++){
    $fontcolor=imagecolorallocate($im,mt_rand(0,255),mt_rand
(0,255),mt_rand(0,255));
    imagesetpixel($im,mt_rand(0,$w),mt_rand(0,$h),$fontcolor);
}
/***********内容*********/
for($i=0;$i<4;$i++){
    $fontcolor=imagecolorallocate($im,mt_rand(0,120),mt_rand
(0,120),mt_rand(0,120)); //这样保证随机出来的颜色较深。
    $codex=iconv("GB2312","UTF-8",substr($code,$i*2,2));
    imagettftext($im,mt_rand(20,24),mt_rand(-
60,60),40*$i+20,mt_rand(30,35),$fontcolor,$fontface,$codex);
}
imagepng($im);
&#63;>

I hope this article will be helpful to everyone’s PHP programming design.

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