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    imagegd2

    (PHP 4 >= 4.0.7, PHP 5)

    imagegd2 — Output GD2 image to browser or file

    說明

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

    Outputs a GD2 image to the given filename.

    參數

    image

    由影像建立函式(例如imagecreatetruecolor())回傳的影像資源。

    filename

    檔案保存的路徑，如果未設置或為 NULL，將會直接輸出影像串流。

    chunk_size

    Chunk size.

    type

    Either IMG_GD2_RAW or IMG_GD2_COMPRESSED. Default is IMG_GD2_RAW.

    回傳值

    如果成功則回傳 TRUE，失敗則回傳 FALSE。

    範例

    Example #1 Outputting a GD2 image

    <?php
    // Create a blank image and add some text
    $im = imagecreatetruecolor(120, 20);
    $text_color = imagecolorallocate($im, 233, 14, 91);
    imagestring($im, 1, 5, 5,  "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(120, 20);
    $text_color = imagecolorallocate($im, 233, 14, 91);
    imagestring($im, 1, 5, 5,  "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);
    ?>

    註釋

    Note: 本函式需要 GD 2.0.1 或更高版本（推薦 2.0.28 及更高版本）。

    Note:

    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.

    參見

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

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    User Contributed Notes 2 notes

    up
    3
    Nick
    12 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
    21 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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