<?php
/**
* 图片验证码生成
* @copyright (c) Emlog All Rights Reserved
*/
session_start();
$randCode = '';
$chars = 'abcdefghijkmnpqrstuvwxyzABCDEFGHIJKLMNPRSTUVWXYZ23456789';
for ( $i = 0; $i < 5; $i++ ){
$randCode .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
}
$_SESSION['chkcode'] = strtolower($randCode);
$img = imagecreate(70,22);
$bgColor = isset($_GET['mode']) && $_GET['mode'] == 't' ? imagecolorallocate($img,245,245,245) : imagecolorallocate($img,255,255,255);
$pixColor = imagecolorallocate($img,mt_rand(30, 180), mt_rand(10, 100), mt_rand(40, 250));
for($i = 0; $i < 5; $i++){
$x = $i * 13 + mt_rand(0, 4) - 2;
$y = mt_rand(0, 3);
$text_color = imagecolorallocate($img, mt_rand(30, 180), mt_rand(10, 100), mt_rand(40, 250));
imagechar($img, 5, $x + 5, $y + 3, $randCode[$i], $text_color);
}
for($j = 0; $j < 60; $j++){
$x = mt_rand(0,70);
$y = mt_rand(0,22);
imagesetpixel($img,$x,$y,$pixColor);
}
header('Content-Type: image/png');
imagepng($img);
imagedestroy($img);
