Extension

Laminas\Validator\File\Extension checks the extension of files. It will assert true when a given file matches any of the defined extensions.

This validator is inversely related to the ExcludeExtension validator.

Supported Options

The following set of options are supported:

• extension: Array of extensions, or comma-delimited string of extensions, against which to test.
• case: Boolean indicating whether extensions should match case sensitively; defaults to false (case-insensitive).
• allowNonExistentFile: Boolean indicating whether to allow validating a filename for a non-existent file. Defaults to false (will not validate non-existent files).

Usage Examples

use Laminas\Validator\File\Extension;

$validator = new Extension([
    'extension' => ['php', 'exe'],
]);

$validator->isValid('./file.php'); // true
$validator->isValid('./file.PHP'); // true

$validator = new Extension([
    'extension' => 'php,exe',
    'case' => true,
]);

$validator->isValid('./file.php'); // true
$validator->isValid('./file.PHP'); // false

Validating Arbitrary Filenames

use Laminas\Validator\File\Extension;

$validator = new Extension([
    'extension' => 'gif,jpg,png',
    'allowNonExistentFile' => true,
]);

$validator->isValid('picture.jpg'); // true
$validator->isValid('something-else.txt'); // false

Validating Uploaded Files

This validator accepts and validates 3 types of argument:

• A string that represents a path or a filename
• An array that represents an uploaded file as per PHP's $_FILES superglobal
• A PSR-7 UploadedFileInterface instance