image.func.php

require_once 'string.func.php';

//通過GD庫做驗證碼

function verifyImage($type=1,$length=4,$pixel=0,$line=0,$sess_name = "verify"){

? ? session_start();

? ? //創建畫布

? ? $width = 80;

? ? $height = 28;

? ? $image = imagecreatetruecolor ( $width, $height );

? ? $white = imagecolorallocate ( $image, 255, 255, 255 );

? ? $black = imagecolorallocate ( $image, 0, 0, 0 );

? ? //用填充矩形填充畫布

? ? imagefilledrectangle ( $image, 1, 1, $width - 2, $height - 2, $white );

? ? $chars = buildRandomString ( $type, $length );

? ? $_SESSION [$sess_name] = $chars;

? ? //$fontfiles = array ("SIMYOU.TTF");

? ? $fontfiles = array ("SIMYOU.TTF" );

? ? for($i = 0; $i < $length; $i ++) {

? ? ? ? $size = mt_rand ( 14, 18 );

? ? ? ? $angle = mt_rand ( - 15, 15 );

? ? ? ? $x = 5 + $i * $size;

? ? ? ? $y = mt_rand ( 20, 26 );

? ? ? ? $fontfile = "../fonts/" . $fontfiles [mt_rand ( 0, count ( $fontfiles ) - 1 )];

? ? ? ? $color = imagecolorallocate ( $image, mt_rand ( 50, 90 ), mt_rand ( 80, 200 ), mt_rand ( 90, 180 ) );

? ? ? ? $text = substr ( $chars, $i, 1 );

? ? ? ? imagettftext ( $image, $size, $angle, $x, $y, $color, $fontfile, $text );

? ? }

? ? if ($pixel) {

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

? ? ? ? ? ? imagesetpixel ( $image, mt_rand ( 0, $width - 1 ), mt_rand ( 0, $height - 1 ), $black );

? ? ? ? }

? ? }

? ? if ($line) {

? ? ? ? for($i = 1; $i < $line; $i ++) {

? ? ? ? ? ? $color = imagecolorallocate ( $image, mt_rand ( 50, 90 ), mt_rand ( 80, 200 ), mt_rand ( 90, 180 ) );

? ? ? ? ? ? imageline ( $image, mt_rand ( 0, $width - 1 ), mt_rand ( 0, $height - 1 ), mt_rand ( 0, $width - 1 ), mt_rand ( 0, $height - 1 ), $color );

? ? ? ? }

? ? }

? ? header ( "content-type:image/gif" );

? ? imagegif ( $image );

? ? imagedestroy ( $image );

? ? }

string.func.php

function buildRandomString($type=1,$length=4){

? ? if ($type == 1) {

? ? ? ? $chars = join ( "", range ( 0, 9 ) );

? ? } elseif ($type == 2) {

? ? ? ? $chars = join ( "", array_merge ( range ( "a", "z" ), range ( "A", "Z" ) ) );

? ? } elseif ($type == 3) {

? ? ? ? $chars = join ( "", array_merge ( range ( "a", "z" ), range ( "A", "Z" ), range ( 0, 9 ) ) );

? ? }

? ? if ($length > strlen ( $chars )) {

? ? ? ? exit ( "字符串長度不夠" );

? ? }

? ? $chars = str_shuffle ( $chars );

? ? return substr ( $chars, 0, $length );

}