Get basic image attributes in a lightweight manner

# Imagick::pingImageFile

(PECL imagick 2, PECL imagick 3)

Imagick::pingImageFile — Get basic image attributes in a lightweight manner

### 说明

public function Imagick::pingImageFile(resource `$filehandle`, string `$fileName` = ?): bool

This method can be used to query image width, height, size, and format without reading the whole image to memory. 此方法在Imagick基于ImageMagick 6.2.9以上版本编译时可用。

### 参数

`filehandle`

  An open filehandle to the image.

`fileName`

  Optional filename for this image.

### 返回值

成功时返回 `true`。

### 示例

示例 #1 Using Imagick::pingImageFile()

Opening a remote location

    <?php
    /* fopen a remote location */
    $fp = fopen("http://example.com/test.jpg");

    /* create new imagick object */
    $im = new Imagick();

    /* pass the handle to imagick */
    $im->pingImageFile($fp);
    ?>

### 参见

- Imagick::pingImage() - Fetch basic attributes about the image
- Imagick::pingImageBlob() - Quickly fetch attributes
- Imagick::readImage() - Reads image from filename
- Imagick::readImageBlob() - 从二进制字符串里读取图片
- Imagick::readImageFile() - Reads image from open filehandle

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