imagecreatefromgif

(PHP 3, PHP 4 )

imagecreatefromgif -- Create a new image from file or URL

Description

resource imagecreatefromgif ( string filename)

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

imagecreatefromgif() 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 GIF:

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

<?php
function LoadGif ($imgname)
{
    
$im = @imagecreatefromgif ($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;
}
?>

Poznámka: Since all GIF support was removed from the GD library in version 1.6, this function is not available if you are using that version of the GD library.

Tip: Môžete použiť URL ako meno súboru s touto funkciou, ak fopen wrappers boli povolené. Pozri fopen() pre ďaľšie detaily ako zadať meno súboru a Dodatok J pre zoznam podporovaných URL protokolov.

Varovanie

Windowsovské verzie PHP staršie ako PHP 4.3.0 nepodporujú prístup k vzdialeným súborom pomocou tejto funkcie, dokonca aj keď je allow_url_fopen dovolené.