Alert: This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness. Use WP_List_Util::sort() instead.

WP_List_Util::sort_callback( object|array $a, object|array $b )

Callback to sort an array by specific fields.


Description

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See also


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Parameters

$a

(object|array) (Required) One object to compare.

$b

(object|array) (Required) The other object to compare.


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Return

(int) 0 if both objects equal. -1 if second object should come first, 1 otherwise.


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Source

File: wp-includes/class-wp-list-util.php

	private function sort_callback( $a, $b ) {
		if ( empty( $this->orderby ) ) {
			return 0;
		}

		$a = (array) $a;
		$b = (array) $b;

		foreach ( $this->orderby as $field => $direction ) {
			if ( ! isset( $a[ $field ] ) || ! isset( $b[ $field ] ) ) {
				continue;
			}

			if ( $a[ $field ] == $b[ $field ] ) {
				continue;
			}

			$results = 'DESC' === $direction ? array( 1, -1 ) : array( -1, 1 );

			if ( is_numeric( $a[ $field ] ) && is_numeric( $b[ $field ] ) ) {
				return ( $a[ $field ] < $b[ $field ] ) ? $results[0] : $results[1];
			}

			return 0 > strcmp( $a[ $field ], $b[ $field ] ) ? $results[0] : $results[1];
		}

		return 0;
	}

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Changelog

Changelog
Version Description
4.7.0 Introduced.

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