WordPress/wp-includes
Pascal Birchler f5fdf443eb Menus: Support nested array variables in POST data when saving menus.
[36510] allowed larger menus to be created in the Edit Menu screen by JSON-encoding the entire form into a single input field. However, it did not correctly handle nested arrays.

This introduces a new `_wp_expand_nav_menu_post_data()` helper function to handle this POST data which uses `array_replace_recursive()` internally. Since the latter is only available on PHP 5.3+, we add a compatibility function to ensure PHP 5.2 support.

Merge of [37748] and [37750] to the 4.5 branch.

Props ericlewis, neverything, swissspidy.
Fixes #36590. See #14134.
Built from https://develop.svn.wordpress.org/branches/4.5@37754


git-svn-id: http://core.svn.wordpress.org/branches/4.5@37719 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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