imagecreatefromjpeg

(PHP 3 >= 3.0.16, PHP 4, PHP 5)

imagecreatefromjpeg -- Create a new image from file or URL

Description

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:

Exempel 1. Example to handle an error during creation (courtesy vic at zymsys dot com )

<?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;
}
?>

Not: JPEG support is only available if PHP was compiled against GD-1.8 or later.

Tips: Du kan anv�nda en URL som filnamn till den h�r funktionen om direktivet fopen wrappers �r p�slaget. Se fopen() f�r fler detaljer kring hur du specificerar filnamnet och f�r en Appendix Mlista �ver st�dda URL-protkoll.

Varning

WINDOWS-versioner f�re 4.3.0 av PHP st�der inte fj�rr�tkomst av filer i den h�r funktionen �ven om allow_url_fopen �r p�slaget.