Callback for validating the external_header_video value.

Description

Ensures that the provided URL is supported.

Parameters

$validityWP_Errorrequired

$valuemixedrequired

Return

Source

public function _validate_external_header_video( $validity, $value ) {
	$video = sanitize_url( $value );
	if ( $video ) {
		if ( ! preg_match( '#^https?://(?:www\.)?(?:youtube\.com/watch|youtu\.be/)#', $video ) ) {
			$validity->add( 'invalid_url', __( 'Please enter a valid YouTube URL.' ) );
		}
	}
	return $validity;
}

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