1 <?php 2 header("content-type:image/png"); 3 $width = 500; 4 $height = 500; 5 $img = imagecreatetruecolor($width, $height); 6 $string = "hello"; 7 //7种颜色，存入数组 8 $red = imagecolorallocate($img, 255, 0, 0); 9 $white = imagecolorallocate($img, 255, 255, 255); 10 $green = imagecolorallocate($img, 0, 255, 0); 11 $blue = imagecolorallocate($img, 0, 0, 255); 12 $aaa = imagecolorallocate($img, 255, 255, 0); 13 $bbb = imagecolorallocate($img, 0, 255, 255); 14 $ccc = imagecolorallocate($img, 255, 0, 255); 15 $colors = array($white,$red,$green,$blue,$aaa,$bbb,$ccc); 16 //画点 17 for ($i=0; $i < 1000; $i++) { 18 imagesetpixel($img, mt_rand(0,$width), mt_rand(0,$height), $colors[mt_rand(0,6)]); 19 } 20 //划线 21 for ($i=0; $i < 200; $i++) { 22 imageline($img, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $colors[mt_rand(0,6)]); 23 } 24 //生成4位验证码 25 $a1 = range(0, 9); 26 $a2 = range(a, z); 27 $a3 = range(A, Z); 28 $a4 = array_merge($a1,$a2,$a3); 29 $num = 4; 30 $fontsize = 60; 31 for ($i=0; $i < 4; $i++) { 32 imagettftext($img, $fontsize, mt_rand(-45,45), $width/$num*$i+$fontsize, $height/2, $colors[mt_rand(0,6)], "Fonts/msyh.ttf", $a4[mt_rand(0,61)]); 33 } 34 35 imagepng($img); 36 ?>
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下面的小一点：
1 <?php 2 header("content-type:image/png"); 3 $width = 110; 4 $height = 40; 5 $img = imagecreatetruecolor($width, $height); 6 $string = "hello"; 7 //7种颜色，存入数组 8 $red = imagecolorallocate($img, 255, 0, 0); 9 $white = imagecolorallocate($img, 255, 255, 255); 10 $green = imagecolorallocate($img, 0, 255, 0); 11 $blue = imagecolorallocate($img, 0, 0, 255); 12 $aaa = imagecolorallocate($img, 255, 255, 0); 13 $bbb = imagecolorallocate($img, 0, 255, 255); 14 $ccc = imagecolorallocate($img, 255, 0, 255); 15 $colors = array($white,$red,$green,$blue,$aaa,$bbb,$ccc); 16 //画点 17 for ($i=0; $i < 10; $i++) { 18 imagesetpixel($img, mt_rand(0,$width), mt_rand(0,$height), $colors[mt_rand(0,6)]); 19 } 20 //划线 21 for ($i=0; $i < 4; $i++) { 22 imageline($img, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $colors[mt_rand(0,6)]); 23 } 24 //生成4位验证码 25 $a1 = range(0, 9); 26 $a2 = range(a, z); 27 $a3 = range(A, Z); 28 $a4 = array_merge($a1,$a2,$a3); 29 $num = 4; 30 $fontsize = 20; 31 for ($i=0; $i < 4; $i++) { 32 imagettftext($img, $fontsize, mt_rand(-45,45), $width/$num*$i+5, 30, $colors[mt_rand(0,6)], "Fonts/msyh.ttf", $a4[mt_rand(0,61)]); 33 } 34 imagepng($img); 35 ?>