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require_wp_db

Load the correct database class file.This function is used to load the database class file either at runtime or by wp-admin/setup-config.php We must globalise $wpdb to ensure that it is defined globally by the inline code in wp-db.php.

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path_join

Join two filesystem paths together (e.g. ‘give me $path relative to $base’).If the $path is absolute, then it the full path is returned.

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path_is_absolute

Test if a give filesystem path is absolute (‘/foo/bar’, ‘c:\windows’).

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