Imagick::setFirstIterator

(PECL imagick 2, PECL imagick 3)

Imagick::setFirstIterator — Sets the Imagick iterator to the first image

Description

public Imagick::setFirstIterator(): bool

Sets the Imagick iterator to the first image.

Parameters

This function has no parameters.

Return Values

Returns true on success.

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User Contributed Notes 1 note

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simonjjarrett at gmail dot com ¶

5 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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