<?php 

//创建画布

    $width = 80;

$height = 28;

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

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

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

//用填充矩形填充画布

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

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

$sess_name="verift";

$_SESSION [$sess_name] = $chars;

$fontfiles = array ("MSYH.TTC", "MSYHL.TTC", "SIMHEI.TTF", "SIMKAI.TTF", "SIMSUN.TTC", );

for($i = 9; $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 );

}

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

imagegif ( $image );

imagedestroy ( $image );