What PHP functions or libraries can be used to analyze a file and determine if it is an image?

To determine if a file is an image in PHP, you can use the `getimagesize()` function which returns an array containing information about the image file. You can then check if the returned data includes image dimensions, which indicates that the file is an image. Another option is to use the `exif_imagetype()` function which returns the image type based on the first bytes of the file. 

// Using getimagesize()
function isImage($file) {
    $image_info = @getimagesize($file);
    return $image_info !== false;
}

// Using exif_imagetype()
function isImage($file) {
    $image_type = @exif_imagetype($file);
    return $image_type !== false;
}

// Usage
$file = 'path/to/image.jpg';
if (isImage($file)) {
    echo 'The file is an image.';
} else {
    echo 'The file is not an image.';
}

Keywords

PHP functions libraries analyze file image

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