Validate a value by running it through one or more callbacks.

validate.php

<?php

/**
 * Validate a value by running it through one or more callbacks.
 *
 * @param mixed $value
 * @param callable $validation
 * @return bool
 */
function validate( $value, $validation ) {
	$valid = true;
	$callbacks = is_callable( $validation ) ? array( $validation ) : (array) $validation;
	foreach ( $callbacks as $callback ) {
		if ( is_callable( $callback ) ) {
			$valid = call_user_func( $callback, $value );
		}
		if ( true !== $valid ) {
			break;
		}
	}
	return true === $valid;
}