Clear resources associated with a PixelIterator

# ImagickPixelIterator::clear

(PECL imagick 2, PECL imagick 3)

ImagickPixelIterator::clear — Clear resources associated with a PixelIterator

### 说明

public function ImagickPixelIterator::clear(): bool
警告

本函数还未编写文档，仅有参数列表。

Clear resources associated with a PixelIterator.

### 返回值

成功时返回 `true`。

### 示例

示例 #1 ImagickPixelIterator::clear()

    <?php
    function clear($imagePath) {
        $imagick = new \Imagick(realpath($imagePath));

        $imageIterator = $imagick->getPixelRegionIterator(100, 100, 250, 200);

        /* Loop through pixel rows */
        foreach ($imageIterator as $pixels) {
            /** @var $pixel \ImagickPixel */
            /* Loop through the pixels in the row (columns) */
            foreach ($pixels as $column => $pixel) {
                if ($column % 2) {
                    /* Paint every second pixel black*/
                    $pixel->setColor("rgba(0, 0, 0, 0)");
                }
            }
            /* Sync the iterator, this is important to do on each iteration */
            $imageIterator->syncIterator();
        }

        $imageIterator->clear();

        header("Content-Type: image/jpg");
        echo $imagick;
    }

    ?>

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