A simple PHP verification code program code_PHP tutorial

There are many programs for generating PHP verification codes online. Now I will share with you a super good PHP verification code program code. Friends in need can refer to it.

Verification code recognition is generally divided into the following steps:

1. Take out the font
2. Binarization
3. Calculate features
4. Control sample

function _code($_code_length = 4, $_width = 75, $_height = 25){ for($i=0;$i<$_code_length;$i++){

The code is as follows

代码如下

复制代码

function _code($_code_length = 4, $_width = 75, $_height = 25){     for($i=0;$i<$_code_length;$i++){         $_nmsg .= dechex(mt_rand(0,15));     }     $_SESSION["code"] = $_nmsg;     $_img = imagecreatetruecolor($_width, $_height);     $_white = imagecolorallocate($_img, 250, 250, 250);     imagefill($_img, 0, 0, $_white);     $_gray = imagecolorallocate($_img, 196, 196, 196);     imagerectangle($_img, 0, 0, $_width-1, $_height-1, $_gray);     for ($i=0; $i < 6; $i++) {         $_md_color = imagecolorallocate($_img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));         imageline($_img, mt_rand(0,$_width), mt_rand(0, $_height),mt_rand(0,$_width), mt_rand(0, $_height), $_md_color);     }     for ($i=0; $i < 50; $i++) {         $_md_color = imagecolorallocate($_img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));         imagestring($_img, 1, mt_rand(1,$_width-5), mt_rand(1, $_height-5), "*", $_md_color);     }     for ($i=0; $i < $_code_length ; $i++) {         $_md_color = imagecolorallocate($_img, mt_rand(0,102), mt_rand(0,102), mt_rand(0,102));         imagestring($_img, 5, $i * $_width/$_code_length+ mt_rand(1, 10), mt_rand(1, $_height/2), $_SESSION["code"][$i], $_md_color);     }     header("Content-Type:image/png");     imagepng($_img);     imagedestroy($_img); }

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代码如下	复制代码
$getcode = $_POST['code']; if( $_SESSION["code"] = $getcode ) {   echo ' 验证合法，进入下一步';   unset( $_SESSION["code"] ); } else {   echo ' 验证码不正确';   header('location:vial.php'); }

           $_nmsg .= dechex(mt_rand(0,15)); }

$_SESSION["code"] = $_nmsg;

$_img = imagecreatetruecolor($_width, $_height); $_white = imagecolorallocate($_img, 250, 250, 250); imagefill($_img, 0, 0, $_white); $_gray = imagecolorallocate($_img, 196, 196, 196); imagerectangle($_img, 0, 0, $_width-1, $_height-1, $_gray); for ($i=0; $i < 6; $i++) {           $_md_color = imagecolorallocate($_img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));

          imageline($_img, mt_rand(0,$_width), mt_rand(0, $_height),mt_rand(0,$_width), mt_rand(0, $_height), $_md_color); }

for ($i=0; $i < 50; $i++) {

          $_md_color = imagecolorallocate($_img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255)); Imagestring($_img, 1, mt_rand(1,$_width-5), mt_rand(1, $_height-5), "*", $_md_color); } for ($i=0; $i < $_code_length ; $i++) {           $_md_color = imagecolorallocate($_img, mt_rand(0,102), mt_rand(0,102), mt_rand(0,102)); imagestring($_img, 5, $i * $_width/$_code_length+ mt_rand(1, 10), mt_rand(1, $_height/2), $_SESSION["code"][$i], $_md_color); } header("Content-Type:image/png"); imagepng($_img); imagedestroy($_img); } How to use verification code

The code is as follows

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$getcode = $_POST['code']; if( $_SESSION["code"] = $getcode ) { echo 'Verify it is legal, go to the next step'; unset( $_SESSION["code"] ); } else { echo 'The verification code is incorrect'; header('location:vial.php'); } http://www.bkjia.com/PHPjc/629627.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/629627.htmlTechArticleThere are many programs for generating PHP verification codes online. Let me share with you a very good PHP verification code program. Code, friends in need can refer to it. Verification code recognition is generally divided into the following steps...