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<?php $pageids = [ ['id' => 1, 'linklabel' => 'Home', 'url' => 'home'], ['id' => 2, 'linklabel' => 'Graphic Design', 'url' => 'graphicdesign'], ['id' => 3, 'linklabel' => 'Other Design', 'url' => 'otherdesign'], ['id' => 6, 'linklabel' => 'Logo Design', 'url' => 'logodesign'], ['id' => 15, 'linklabel' => 'Content Writing', 'url' => 'contentwriting'], ]; $parentpage = [ ['id' => 2, 'linklabel' => 'Graphic Design', 'url' => 'graphicdesign'], ['url' => 'otherdesign', 'id' => 3, 'linklabel' => 'Other Design'], ]; var_export( array_udiff($pageids, $parentpage, fn($a, $b) => $a <=> $b) );
Output for git.master_jit, git.master, rfc.property-hooks
array ( 0 => array ( 'id' => 1, 'linklabel' => 'Home', 'url' => 'home', ), 3 => array ( 'id' => 6, 'linklabel' => 'Logo Design', 'url' => 'logodesign', ), 4 => array ( 'id' => 15, 'linklabel' => 'Content Writing', 'url' => 'contentwriting', ), )

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