imagecreatefromjpeg

Create a new image from file or URL (PHP 3>= 3.0.16, PHP 4 )
resource imagecreatefromjpeg ( string filename )

imagecreatefromjpeg() returns an image identifier representing the image obtained from the given filename.

imagecreatefromjpeg() returns an empty string on failure. It also outputs an error message, which unfortunately displays as a broken link in a browser. To ease debugging the following example will produce an error JPEG:

Example 414. Example to handle an error during creation (courtesy vic at zymsys dot com )

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<?php
function LoadJpeg ($imgname) {
   $im = @imagecreatefromjpeg ($imgname); /* Attempt to open */
   if (!$im) { /* See if it failed */
       $im  = imagecreate (150, 30); /* Create a blank image */
       $bgc = imagecolorallocate ($im, 255, 255, 255);
       $tc  = imagecolorallocate ($im, 0, 0, 0);
       imagefilledrectangle ($im, 0, 0, 150, 30, $bgc);
       /* Output an errmsg */
       imagestring ($im, 1, 5, 5, "Error loading $imgname", $tc);
   }
   return $im;
}
?>
Tip:

You can use a URL as a filename with this function if the fopen wrappers have been enabled. See fopen() for more details on how to specify the filename and Appendix I for a list of supported URL protocols.

Warning:

Windows versions of PHP prior to PHP 4.3.0 do not support accessing remote files via this function, even if allow_url_fopen is enabled.

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