imagegd2

(PHP 4 >= 4.0.7, PHP 5)

imagegd2Output GD2 image to browser or file

Descrierea

bool imagegd2 ( resource $image [, string $filename [, int $chunk_size [, int $type = IMG_GD2_RAW ]]] )

Outputs a GD2 image to the given filename.

Parametri

image

O resursă - imagine, întoarsă de una din funcțiile de creare a imaginilor, cum ar fi imagecreatetruecolor().

filename

Calea unde va fi salvat fișierul. Dacă nu este stabilită sau este NULL, atunci fluxul imaginii va fi afișat direct.

chunk_size

Chunk size.

type

Either IMG_GD2_RAW or IMG_GD2_COMPRESSED. Default is IMG_GD2_RAW.

Valorile întoarse

Întoarce valoarea TRUE în cazul succesului sau FALSE în cazul eșecului.

Exemple

Example #1 Outputting a GD2 image

<?php
// Create a blank image and add some text
$im imagecreatetruecolor(12020);
$text_color imagecolorallocate($im2331491);
imagestring($im155,  "A Simple Text String"$text_color);

// Output the image
imagegd2($im);

// Free up memory
imagedestroy($im);
?>

Example #2 Saving a GD2 image

<?php
// Create a blank image and add some text
$im imagecreatetruecolor(12020);
$text_color imagecolorallocate($im2331491);
imagestring($im155,  "A Simple Text String"$text_color);

// Save the gd2 image
// The file format for GD2 images is .gd2, see http://www.libgd.org/GdFileFormats
imagegd2($im'simple.gd2');

// Free up memory
imagedestroy($im);
?>

Note

Notă: Această funcție necesită GD 2.0.1 sau ulterioară (2.0.28 sau ulterioară este recomandată).

Notă:

The GD2 format is commonly used to allow fast loading of parts of images. Note that the GD2 format is only usable in GD2-compatible applications.

Istoria schimbărilor

Versiunea Descriere
4.3.2 chunk_size and type were added.

Vedeți de asemenea

  • imagegd() - Output GD image to browser or file

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User Contributed Notes 2 notes

up
0
Nick
2 years ago
You can use this function in combination with imagecreatefromstring() to clone the gd resource with minimum fuss (no writing to tmp file):

<?php
function cloneGd($gd)
{
   
ob_start();
   
imagegd2($gd);
    return
imagecreatefromstring(ob_get_clean());
}
?>
up
0
mark at teckis dot com
11 years ago
yes, the gd2 file format does improve the speed of image creations as the data-setup is designed to be native for the GD function - ie, the image doesn't have to be converted to a usable format prior to processing.

you may also note that the newer gd2 format creates much smaller size files than the older imagegd function, certainly for images involving chunks of single colours anyway. you'll probably find this function most useful for saving overlay images or background images used in larger image creation scripts.

to read a ping or jpeg image (.png / .jpg) and save a .gd2 version to server...

$img = $_GET['img'];
if(file_exists($img))
    {
    $dim = getimagesize($img);
    $cr = ($dim[2] < 4) ? ($dim[2] < 3) ? ($dim[2] < 2) ? NULL : imagecreatefromjpeg($img) : imagecreatefrompng($img) : Null;
    if($cr !== NULL)
          {
         imagegd2($cr,substr($img,0,strrpos($img,'.')).'.gd2');
          }
    }

should save a copy with the same filename and directory using extension .gd2 - which can then be nicely and swiftly read using either imagecreatefromgd2 or imagecreatefromgd2part
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