- array_diff_assoc: documentation ( source)
- var_dump: documentation ( source)
- array_unique: documentation ( source)
<?php
$a = array(
'post' => array(
'tr' => array(
'slug' => 'a'
),
'en' => array('slug'=>'b')
)
);
echo var_dump(array_unique( array_diff_assoc( $a['post'], array_unique( $a['post'] ) ) ));
?>