Emlog被恶意评论灌水解决教程

<?php
/**
 * Emlog验证码防干扰
 * 夜河资源网: https://www.yehes.com/
 */
 
session_start();
 
$randCode = '';
$chars = 'abcdefghijkmnpqrstuvwxyzABCDEFGHIJKLMNPRSTUVWXYZ23456789';
for ( $i = 0; $i < 5; $i++ ){
	$randCode .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
}
 
$_SESSION['code'] = strtoupper($randCode);
 
$img = imagecreate(75,25) or die("创建图像资源失败,请刷新页面");
$bgColor = isset($_GET['mode']) && $_GET['mode'] == 't' ? imagecolorallocate($img,245,245,245) : imagecolorallocate($img,255,255,255);
$pixColor = imagecolorallocate($img,mt_rand(88, 245), mt_rand(55, 240), mt_rand(99, 200));
//画字符、大小
for($i = 0; $i < 5; $i++){
	$x = $i * 13 + mt_rand(3, 7) - 2;
	$y = mt_rand(0, 3);
	$text_color = imagecolorallocate($img, mt_rand(100, 250), mt_rand(80, 180), mt_rand(90, 220));
	imagechar($img, 5, $x + 5, $y + 3, $randCode[$i], $text_color);
}
//画干扰点
for($j = 0; $j < 240; $j++){
	$x = mt_rand(0,500);
	$y = mt_rand(0,100);
	imagesetpixel($img,$x,$y,$pixColor);
}
//4条横斜线
for ($i=0; $i < 5; $i++) { 
    $lineColor = imagecolorallocate($img, rand(50, 150), rand(50, 150), rand(50, 150));
    $lineX1 = 0;
    $lineX2 = 90;
    $lineY1 = ($i + 1) * 8;
    $lineY2 = ($i + 1) * 15;
    imageline($img, $lineX1, $lineY1, $lineX2, $lineY2, $lineColor);
}
 
//4条竖斜线
for ($i=0; $i < 5; $i++) { 
    $lineColor = imagecolorallocate($img, rand(50, 150), rand(50, 150), rand(50, 150));
    $lineY1 = 0;
    $lineY2 = 90;
    $lineX1 = ($i + 1) * 8;
    $lineX2 = ($i + 1) * 15;
    imageline($img, $lineX1, $lineY1, $lineX2, $lineY2, $lineColor);
}
 
header('Content-Type: image/png');
imagepng($img);
imagedestroy($img);