Merges image layers

# Imagick::mergeImageLayers

(PECL imagick 2 >= 2.1.0, PECL imagick 3)

Imagick::mergeImageLayers — Merges image layers

### 说明

public function Imagick::mergeImageLayers(int `$layer_method`): Imagick

Merges image layers into one. This method is useful when working with image formats that use multiple layers such as PSD. The merging is controlled using the `layer_method` which defines how the layers are merged. 此方法在Imagick基于ImageMagick 6.3.7以上版本编译时可用。

### 参数

`layer_method`

  One of the `Imagick::LAYERMETHOD_*` constants

### 返回值

Returns an Imagick object containing the merged image.

### 错误／异常

错误时抛出 ImagickException。

### 示例

示例 #1 Imagick::mergeImageLayers()

    <?php
    function mergeImageLayers($layerMethodType, $imagePath1, $imagePath2) {

        $imagick = new \Imagick(realpath($imagePath1));

        $imagick2 = new \Imagick(realpath($imagePath2));
        $imagick->addImage($imagick2);
        $imagick->setImageFormat('png');

        $result = $imagick->mergeImageLayers($layerMethodType);
        header("Content-Type: image/png");
        echo $result->getImageBlob();
    }

    ?>

### 参见

- Imagick::flattenImages() - Merges a sequence of images

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