50 lines
1.5 KiB
PHP
Executable File
50 lines
1.5 KiB
PHP
Executable File
<?php
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session_start();
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$width = 120;
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$height = 42;
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$fontSize = 20;
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$image = imagecreatetruecolor($width, $height);
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$bgColor = imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 0, 0, $bgColor);
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// 干扰线
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for ($i = 0; $i < 5; $i++) {
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$lineColor = imagecolorallocatealpha($image, rand(100, 200), rand(100, 200), rand(100, 200), 50);
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imageline($image, rand(0, $width), rand(0, $height), rand(0, $width), rand(0, $height), $lineColor);
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}
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// 干扰点
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for ($i = 0; $i < 80; $i++) {
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$pixelColor = imagecolorallocate($image, rand(150, 200), rand(150, 200), rand(150, 200));
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imagesetpixel($image, rand(0, $width), rand(0, $height), $pixelColor);
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}
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$chars = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789';
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$code = '';
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for ($i = 0; $i < 4; $i++) {
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$code .= $chars[rand(0, strlen($chars) - 1)];
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}
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$_SESSION['captcha'] = $code;
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// 尝试使用TTF字体，不存在则用内置字体
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$fontFile = __DIR__ . '/assets/arial.ttf';
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if (file_exists($fontFile)) {
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for ($i = 0; $i < 4; $i++) {
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$angle = rand(-15, 15);
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$x = 8 + $i * 28;
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$textColor = imagecolorallocate($image, rand(30, 100), rand(30, 100), rand(30, 100));
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imagettftext($image, $fontSize, $angle, $x, 34, $textColor, $fontFile, $code[$i]);
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}
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} else {
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$textColor = imagecolorallocate($image, 50, 50, 50);
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imagestring($image, 5, 10, 12, $code, $textColor);
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}
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header('Content-Type: image/png');
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header('Cache-Control: no-cache, no-store, must-revalidate');
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imagepng($image);
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imagedestroy($image);
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