Taxonomy: Extend `get_term_by` to accept `ID` as a term parameter.

Similar to `get_user_by`, both `ID` and `id` should be able to accepted.

Fixes #45163.
Props emrikol, esoj.
 

Built from https://develop.svn.wordpress.org/trunk@47865


git-svn-id: http://core.svn.wordpress.org/trunk@47641 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/taxonomy.php

@@ -913,10 +913,11 @@ function get_term( $term, $taxonomy = '', $output = OBJECT, $filter = 'raw' ) {
  * @since 2.3.0
  * @since 4.4.0 `$taxonomy` is optional if `$field` is 'term_taxonomy_id'. Converted to return
  *              a WP_Term object if `$output` is `OBJECT`.
+ * @since 5.5.0 ID is an alias of id.
  *
  * @see sanitize_term_field() The $context param lists the available values for get_term_by() $filter param.
  *
- * @param string     $field    Either 'slug', 'name', 'id' (term_id), or 'term_taxonomy_id'
+ * @param string     $field    Either 'slug', 'name', 'id' (term_id or ID), or 'term_taxonomy_id'
  * @param string|int $value    Search for this term value
  * @param string     $taxonomy Taxonomy name. Optional, if `$field` is 'term_taxonomy_id'.
  * @param string     $output   Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
@@ -941,7 +942,7 @@ function get_term_by( $field, $value, $taxonomy = '', $output = OBJECT, $filter
 		}
 	}
 
-	if ( 'id' === $field || 'term_id' === $field ) {
+	if ( 'id' === $field || 'term_id' === $field || 'ID' === $field ) {
 		$term = get_term( (int) $value, $taxonomy, $output, $filter );
 		if ( is_wp_error( $term ) || null === $term ) {
 			$term = false;

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-alpha-47864';
+$wp_version = '5.5-alpha-47865';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.