<?php
$string="welcome to my webside";
getAuthImage($string);
function getAuthImage( $string , $im_x = 120 , $im_y = 60) {
ob_start();
$im_x = 120;
$im_y = 60;

$im = imagecreatetruecolor ($im_x, $im_y);
imagefill($im, 0, 0, imagecolorallocate($im,255,255,255) );


//注意以下字体文件需要有
$stringColor = imagecolorallocate($im, 17, 158, 20);
imagettftext ($im, 24, rand(-6 , 6), $im_x*0.1, $im_y*0.7, $stringColor, '/usr/local/share/fonts/georgia.ttf', $string);

//扭曲，变形

$distortion_im = imagecreatetruecolor ($im_x*1.5 , $im_y);
imagefill($distortion_im, 0, 0, imagecolorallocate($distortion_im,255,255,255) );
for ( $i=0; $i<$im_x; $i++) {
for ( $j=0; $j<$im_y; $j++) {
$rgb = imagecolorat($im, $i , $j);
if( (int)($i+20+sin($j/$im_y*2*M_PI)*10) <= imagesx($distortion_im) && (int)($i+20+sin($j/$im_y*2*M_PI)*10) >=0 ) {
imagesetpixel ($distortion_im, (int)($i+20+sin($j/$im_y*2*M_PI-M_PI*0.4)*8) , $j , $rgb);
}
}
}

//pixel

for($i=0; $i <= 64; $i++) {
$pointcolor = imagecolorallocate($distortion_im, 17, 158, 20);
imagesetpixel($distortion_im, rand(0, imagesx($distortion_im)), rand(0, imagesy($distortion_im)), $pointcolor);
}


ob_clean();
header('Content-type: image/jpeg');
imagejpeg ($distortion_im);
imagedestroy($im);
imagedestroy($distortion_im);
}

?>