How can file extensions be checked in PHP?

To check file extensions in PHP, you can use the pathinfo() function to get the file extension from a file path. This function returns an associative array with information about the file path, including the file extension. You can then compare the file extension to a list of allowed extensions to determine if it is valid. 

$file_path = 'example.jpg';
$allowed_extensions = ['jpg', 'png', 'gif'];

$file_info = pathinfo($file_path);
$file_extension = $file_info['extension'];

if (in_array($file_extension, $allowed_extensions)) {
    echo 'File extension is allowed';
} else {
    echo 'File extension is not allowed';
}

Keywords

file extensions PHP validation pathinfo mime_content_type

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