WordPress at a glance
function is not described

_doing_it_wrong() WP 3.1.0

Mark something as being incorrectly called.

There is a hook 'doing_it_wrong_run' that will be called that can be used to get the backtrace up to what file and function called the deprecated function.

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

Hooks in function
Return

Nothing (null).

Usage

_doing_it_wrong( $function, $message, $version );
$function(string) (required)
The function that was called.
$message(string) (required)
A message explaining what has been done incorrectly.
$version(string) (required)
The version of WordPress where the message was added.

Code of doing it wrong: wp-includes/functions.php VER 5.1.1

<?php
function _doing_it_wrong( $function, $message, $version ) {

	/**
	 * Fires when the given function is being used incorrectly.
	 *
	 * @since 3.1.0
	 *
	 * @param string $function The function that was called.
	 * @param string $message  A message explaining what has been done incorrectly.
	 * @param string $version  The version of WordPress where the message was added.
	 */
	do_action( 'doing_it_wrong_run', $function, $message, $version );

	/**
	 * Filters whether to trigger an error for _doing_it_wrong() calls.
	 *
	 * @since 3.1.0
	 * @since 5.1.0 Added the $function, $message and $version parameters.
	 *
	 * @param bool   $trigger  Whether to trigger the error for _doing_it_wrong() calls. Default true.
	 * @param string $function The function that was called.
	 * @param string $message  A message explaining what has been done incorrectly.
	 * @param string $version  The version of WordPress where the message was added.
	 */
	if ( WP_DEBUG && apply_filters( 'doing_it_wrong_trigger_error', true, $function, $message, $version ) ) {
		if ( function_exists( '__' ) ) {
			if ( is_null( $version ) ) {
				$version = '';
			} else {
				/* translators: %s: version number */
				$version = sprintf( __( '(This message was added in version %s.)' ), $version );
			}
			/* translators: %s: Codex URL */
			$message .= ' ' . sprintf(
				__( 'Please see <a href="%s">Debugging in WordPress</a> for more information.' ),
				__( 'https://codex.wordpress.org/Debugging_in_WordPress' )
			);
			/* translators: Developer debugging message. 1: PHP function name, 2: Explanatory message, 3: Version information message */
			trigger_error( sprintf( __( '%1$s was called <strong>incorrectly</strong>. %2$s %3$s' ), $function, $message, $version ) );
		} else {
			if ( is_null( $version ) ) {
				$version = '';
			} else {
				$version = sprintf( '(This message was added in version %s.)', $version );
			}
			$message .= sprintf(
				' Please see <a href="%s">Debugging in WordPress</a> for more information.',
				'https://codex.wordpress.org/Debugging_in_WordPress'
			);
			trigger_error( sprintf( '%1$s was called <strong>incorrectly</strong>. %2$s %3$s', $function, $message, $version ) );
		}
	}
}