我已经在本地服务器和在线网络服务器上进行了测试...但返回一个空图像...
检查返回结果... http://s8.postimage.org/sthztzj5x/null_image.jpg
<?php
Set the content-type
header('Content-Type: image/png');
$im = imagecreatetruecolor(400, 30);
$white = imagecolorallocate($im, 255, 255, 255);
$grey = imagecolorallocate($im, 128, 128, 128);
$black = imagecolorallocate($im, 0, 0, 0);
imagefilledrectangle($im, 0, 0, 399, 29, $white);
$text = 'Testing...';
$font = 'arial.ttf';
imagettftext($im, 20, 0, 11, 21, $grey, $font, $text);
imagettftext($im, 20, 0, 10, 20, $black, $font, $text);
imagepng($im);
imagedestroy($im);
?>