Imagick::setIteratorIndex

    (PECL imagick 2, PECL imagick 3)

    Imagick::setIteratorIndex — Set the iterator position

    Descrizione

    public Imagick::setIteratorIndex(int $index): bool

    Set the iterator to the position in the image list specified with the index parameter. Questo metodo è disponibile se Imagick è stato compilato con ImageMagick versione 6.2.9 o successive.

    Elenco dei parametri

    index

    The position to set the iterator to

    Valori restituiti

    Restituisce true in caso di successo.

    Esempi

    Example #1 Using Imagick::setIteratorIndex():

    Create images, set and get the iterator index

    <?php
    $im     = new Imagick();
    $im->newImage(100, 100, new ImagickPixel("red"));
    $im->newImage(100, 100, new ImagickPixel("green"));
    $im->newImage(100, 100, new ImagickPixel("blue"));

    $im->setIteratorIndex(1);
    echo     $im->getIteratorIndex();
    ?>

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    User Contributed Notes 1 note

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    wilcobeekhuizen at gmail dot com
    13 years ago
    This function returns true on success but setting the iterator to an invalid index throws an exception instead of returning false:
    Fatal error: Uncaught exception 'ImagickException' with message 'Unable to set iterator index'

    This can happen when counting images inside a gif file, because the iterator count starts at zero and not one. If you count the number of images in a gif file be sure to use iterator 0 for the first image, like this:

    <?php
    $image     = new Imagick('simple.gif');
    $image->setIteratorIndex(0);
    ?>
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