How can the PHP function getimagesize() be used to check the size of an external image file?

The PHP function `getimagesize()` can be used to check the size of an external image file by providing the URL of the image as an argument to the function. This function returns an array containing the dimensions of the image (width and height) as well as the image type and attributes. By using this function, you can easily retrieve the size information of an external image file without needing to download the file locally. 

$image_url = 'https://example.com/image.jpg';
$image_size = getimagesize($image_url);

if($image_size){
    $width = $image_size[0];
    $height = $image_size[1];
    echo "Image dimensions: $width x $height pixels";
} else {
    echo "Unable to get image size.";
}

Keywords

PHP getimagesize() external image file size validation

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