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php 图片验证码

php验证码程序 验证码 代码 php php 图片验证码

?php/*@date 20080514@author hluan

//session_start();class icode{function __construct(){
header(‘Content-Type:image/png’);}function __destruct(){
imagedestroy($png);}function getcode($len,$type){ switch ($type){ case
1; $str = 1234567890; break; case 2; $str = abcdefghijklmnopqrstuvwxyz;
break; case 0; $str = 1234567890abcdefghijklmnopqrstuvwxyz; break; }
$result = ; $length = strlen($str) – 1; $num = 0; for
($i=0;$i$len;$i++){ $num = rand(0,$length); $a = $str[$num]; $result =
$result.$a; } /*Before using it,you should use session_start()*/
$_SESSION[‘icode’] = $result;//Store in session. //echo
session:.$_SESSION[‘icode’]; //die(); $png = imagecreate(60,30);
$white = imagecolorallocate($png,255,255,255);//background $red =
imagecolorallocate($png,255,0,0); $blue =
imagecolorallocate($png,0,0,255); $brown =
imagecolorallocate($png,100,0,0); $black =
imagecolorallocate($png,0,0,0);//Identifying Code
imagefill($png,0,0,$white); $k = rand(0,3); if (0 == $k){ for
($n=0;$n60;$n++){ $y = 15*sin($n/30*pi());
imagesetpixel($png,$n,15+$y,$red); } }else if (1 == $k){ for
($n=0;$n60;$n++){ $y = 15*cos($n/60*pi());
imagesetpixel($png,$n,15+$y,$red); } }else if (2 == $k){ for
($n=0;$n60;$n++){ $y = 15*sin($n/45*pi());
imagesetpixel($png,$n,15+$y,$brown); } }else if (3 == $k){ for
($n=0;$n60;$n++){ $y = 15*cos($n/30*pi());
imagesetpixel($png,$n,15+$y,$brown); } } for ($k=0;$k10;$k++){ $i =
rand(3,60);//width $j = rand(3,15);//height
imageline($png,$i-3,$j-3,$i,$j,$black); }
imagestring($png,5,3,5,$result,$blue); $icode = imagepng($png); return
$icode;}}/*测试代码$icode = new icode();$icp = $icode-getcode(6,0);echo
$icp;*/

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