_deprecated_constructor()WP 4.3.0

Marks a constructor as deprecated and informs when it has been used.

Similar to _deprecated_function(), but with different strings. Used to remove PHP4-style constructors.

The current behavior is to trigger a user error if WP_DEBUG is true.

This function is to be used in every PHP4-style constructor method that is deprecated.

Internal function — this function is designed to be used by the kernel itself. It is not recommended to use this function in your code.

Return

null. Nothing (null).

Usage

_deprecated_constructor( $class_name, $version, $parent_class );
$class_name(string) (required)
The class containing the deprecated constructor.
$version(string) (required)
The version of WordPress that deprecated the function.
$parent_class(string)
The parent class calling the deprecated constructor.
Default: empty string

Changelog

Since 4.3.0 Introduced.
Since 4.5.0 Added the $parent_class parameter.
Since 5.4.0 This function is no longer marked as "private".
Since 5.4.0 The error type is now classified as E_USER_DEPRECATED (used to default to E_USER_NOTICE).

_deprecated_constructor() code WP 6.5.4

function _deprecated_constructor( $class_name, $version, $parent_class = '' ) {

	/**
	 * Fires when a deprecated constructor is called.
	 *
	 * @since 4.3.0
	 * @since 4.5.0 Added the `$parent_class` parameter.
	 *
	 * @param string $class_name   The class containing the deprecated constructor.
	 * @param string $version      The version of WordPress that deprecated the function.
	 * @param string $parent_class The parent class calling the deprecated constructor.
	 */
	do_action( 'deprecated_constructor_run', $class_name, $version, $parent_class );

	/**
	 * Filters whether to trigger an error for deprecated functions.
	 *
	 * `WP_DEBUG` must be true in addition to the filter evaluating to true.
	 *
	 * @since 4.3.0
	 *
	 * @param bool $trigger Whether to trigger the error for deprecated functions. Default true.
	 */
	if ( WP_DEBUG && apply_filters( 'deprecated_constructor_trigger_error', true ) ) {
		if ( function_exists( '__' ) ) {
			if ( $parent_class ) {
				$message = sprintf(
					/* translators: 1: PHP class name, 2: PHP parent class name, 3: Version number, 4: __construct() method. */
					__( 'The called constructor method for %1$s class in %2$s is <strong>deprecated</strong> since version %3$s! Use %4$s instead.' ),
					$class_name,
					$parent_class,
					$version,
					'<code>__construct()</code>'
				);
			} else {
				$message = sprintf(
					/* translators: 1: PHP class name, 2: Version number, 3: __construct() method. */
					__( 'The called constructor method for %1$s class is <strong>deprecated</strong> since version %2$s! Use %3$s instead.' ),
					$class_name,
					$version,
					'<code>__construct()</code>'
				);
			}
		} else {
			if ( $parent_class ) {
				$message = sprintf(
					'The called constructor method for %1$s class in %2$s is <strong>deprecated</strong> since version %3$s! Use %4$s instead.',
					$class_name,
					$parent_class,
					$version,
					'<code>__construct()</code>'
				);
			} else {
				$message = sprintf(
					'The called constructor method for %1$s class is <strong>deprecated</strong> since version %2$s! Use %3$s instead.',
					$class_name,
					$version,
					'<code>__construct()</code>'
				);
			}
		}

		wp_trigger_error( '', $message, E_USER_DEPRECATED );
	}
}