- PHP 手册
- 函数参考
- 图像生成和处理
- ImageMagick
- Imagick
Imagick::pingImage
(PECL imagick 2, PECL imagick 3)
Imagick::pingImage — Fetch basic attributes about the image
说明
public Imagick::pingImage(string$filename): bool
This method can be used to query image width, height, size, and format without reading the whole image in to memory.
参数
-
filename -
The filename to read the information from.
返回值
成功时返回 true。
User Contributed Notes 4 notes
up down 3 hello at digitalnature dot eu ¶8 years ago
Just a warning: don't use Eero Niemi's code (identifyImage with pingImage) if you just want to get the image width and height, because it will actually be slower than reading the whole image into memory - about 10x slower!
Correct code should be:
<?php
$image = new Imagick();
$image->pingImage($file);
$width = $image->getImageWidth();
$height = $image->getImageHeight();
?>
(this is around 15 times faster than reading the image in memory)
up
down
0
Sergey ¶9 years ago
If you don't sure whether the file exists or not or maybe it's broken, then you should use try - catch construction. It prevents code fails, when code stops execution after call of pingImage (if the file doesn't exist or it's broken).
<?php
$im = new Imagick();
try {
$im->pingImage('3.jpg');
}
catch(ImagickException $e) {
echo "image doesn't exist";
}
?>
up
down
-6
Gynoid ¶6 years ago
Also you can do:
$image = new Imagick($file);
$width = $image->getImageWidth();
$height = $image->getImageHeight();
to catch the witdth/height parameters without use pingImage() initialization.
up
down
-7
Eero Niemi (eero at eero dot info) ¶14 years ago
Actually the previous example causes file to be loaded twice on Imagick's stack, proper way to do this is:
<?php
$file = 'foo.jpg';
$image = new Imagick();
$image->pingImage($file);
$image_info = $image->identifyImage();
?>
add a note
官方地址：https://www.php.net/manual/en/imagick.pingimage.php