| 例子 1. 处理创建过程中的错误(courtesy vic at zymsys dot com) | 
<?phpfunction LoadWBMP ($imgname) {
 $im = @imagecreatefromwbmp ($imgname); /* Attempt to open */
 if (!$im) { /* See if it failed */
 $im  = imagecreate (20, 20); /* Create a blank image */
 $bgc = imagecolorallocate ($im, 255, 255, 255);
 $tc  = imagecolorallocate ($im, 0, 0, 0);
 imagefilledrectangle ($im, 0, 0, 10, 10, $bgc);
 /* Output an errmsg */
 imagestring ($im, 1, 5, 5, "Error loading $imgname", $tc);
 }
 return $im;
 }
 ?>
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