imagecreatefromgif

(PHP 3, PHP 4 , PHP 5)

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:

Esempio 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;
}
?>

Nota: 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.

Suggerimento: possibile utilizzare una URL come un nome di file con questa funzione se fopen wrappers stata abilitata. Per maggiori informazioni su come specificare i nomi di file vedere fopen() e Appendice L per avere la lista dei protocolli URL supportati.

Avvertimento

la versione per Windows di PHP antecedente la 4.3.0 non supporta l'accesso remoto ai file da parte di questa funzione, anche se allow_url_fopen abilitato.