Imagick::setFirstIterator

(PECL imagick 2, PECL imagick 3)

Imagick::setFirstIteratorSets the Imagick iterator to the first image

Descrizione

public Imagick::setFirstIterator(): bool

Sets the Imagick iterator to the first image.

Elenco dei parametri

Questa funzione non contiene parametri.

Valori restituiti

Restituisce true in caso di successo.

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User Contributed Notes 1 note

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simonjjarrett at gmail dot com
4 years ago
The following function applies a callback to each image in an Imagick object.

<?php
function imagickMap($callback, $im)
{
$im->setFirstIterator();

do
{
$callback($im);
}
while (
$im->nextImage() );
}
?>

E.g. to convert a series of images to grayscale:

<?php
imagickMap
(
function(
$im)
{
$im->setImageType(Imagick::IMGTYPE_GRAYSCALEMATTE);
},
$im
);
?>
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