Tests: Replace `join()` with `implode()` in `do_enclose()` tests introduced in [46175], and ensure the arguments passed are in the correct order.

The `implode()` function accepts two parameters, `$glue` and `$pieces`. For historical reasons, these parameters have been accepted in any order, though it was recommended that the documented order of `$glue, $pieces` be used. It is also generally considered best practice to use the canonical function rather than an alias.

Starting in PHP 7.4, specifying the parameters in the reverse order will trigger a deprecation notice with the plan to remove this tolerance in PHP 8.0.

Props jrf.
Fixes #36824. See #47746.
Built from https://develop.svn.wordpress.org/trunk@46182


git-svn-id: http://core.svn.wordpress.org/trunk@45994 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-46181';
+$wp_version = '5.3-alpha-46182';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.