General: Add _wp_array_set function.

This adds the _wp_array_set function, which is the counterpart of the existing _wp_array_get.
This utility is to be used by the Global Settings work.

Props nosolosw, jorgefilipecosta.
See #53175.

Built from https://develop.svn.wordpress.org/trunk@50958


git-svn-id: http://core.svn.wordpress.org/trunk@50567 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.php

@@ -4626,6 +4626,65 @@ function _wp_array_get( $array, $path, $default = null ) {
 	return $array;
 }
 
+/**
+ * Sets an array in depth based on a path of keys.
+ *
+ * It is the PHP equivalent of JavaScript's `lodash.set()` and mirroring it may help other components
+ * retain some symmetry between client and server implementations.
+ *
+ * Example usage:
+ *
+ *     $array = array();
+ *     _wp_array_set( $array, array( 'a', 'b', 'c', 1 );
+ *     $array becomes:
+ *     array(
+ *         'a' => array(
+ *             'b' => array(
+ *                 'c' => 1,
+ *             ),
+ *         ),
+ *     );
+ *
+ * @param array $array   An array that we want to mutate to include a specific value in a path.
+ * @param array $path    An array of keys describing the path that we want to mutate.
+ * @param mixed $value   The value that will be set.
+ */
+function _wp_array_set( &$array, $path, $value = null ) {
+	// Confirm $array is valid.
+	if ( ! is_array( $array ) ) {
+		return;
+	}
+
+	// Confirm $path is valid.
+	if ( ! is_array( $path ) ) {
+		return;
+	}
+	$path_length = count( $path );
+	if ( 0 === $path_length ) {
+		return;
+	}
+	foreach ( $path as $path_element ) {
+		if (
+			! is_string( $path_element ) && ! is_integer( $path_element ) &&
+			! is_null( $path_element )
+		) {
+			return;
+		}
+	}
+
+	for ( $i = 0; $i < $path_length - 1; ++$i ) {
+		$path_element = $path[ $i ];
+		if (
+			! array_key_exists( $path_element, $array ) ||
+			! is_array( $array[ $path_element ] )
+		) {
+			$array[ $path_element ] = array();
+		}
+		$array = &$array[ $path_element ]; // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.VariableRedeclaration
+	}
+	$array[ $path[ $i ] ] = $value;
+}
+
 /**
  * Determines if the variable is a numeric-indexed array.
  *

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.8-alpha-50957';
+$wp_version = '5.8-alpha-50958';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.