Imagick::setFirstIterator
(PECL imagick 2, PECL imagick 3)
Imagick::setFirstIterator — Sets the Imagick iterator to the first image
说明
public Imagick::setFirstIterator(): bool
Sets the Imagick iterator to the first image.
参数
此函数没有参数。
返回值
成功时返回 true
。
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User Contributed Notes 1 note
simonjjarrett at gmail dot com ¶
2 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
);
?>
备份地址:http://www.lvesu.com/blog/php/imagick.setfirstiterator.php