function file_validate

Checks that a file meets the criteria specified by the validators.

After executing the validator callbacks specified hook_file_validate() will also be called to allow other modules to report errors about the file.


$file: A Drupal file object.

$validators: An optional, associative array of callback functions used to validate the file. The keys are function names and the values arrays of callback parameters which will be passed in after the file object. The functions should return an array of error messages; an empty array indicates that the file passed validation. The functions will be called in the order specified.

Return value

An array containing validation error messages.

See also


Related topics

2 calls to file_validate()
FileValidateTest::testCallerValidation in drupal/modules/simpletest/tests/file.test
Test that the validators passed into are checked.
file_save_upload in drupal/includes/
Saves a file upload to a new location.


drupal/includes/, line 1696
API for handling file uploads and server file management.


function file_validate(stdClass &$file, $validators = array()) {

  // Call the validation functions specified by this function's caller.
  $errors = array();
  foreach ($validators as $function => $args) {
    if (function_exists($function)) {
      array_unshift($args, $file);
      $errors = array_merge($errors, call_user_func_array($function, $args));

  // Let other modules perform validation on the new file.
  return array_merge($errors, module_invoke_all('file_validate', $file));