- var_dump: documentation ( source)
- array_unique: documentation ( source)
<?php
$array = array(
array( "a", "b", "c" => "def" ),
array( "aa", "bb", "cc" => "def" ),
array( "a", "b", "c" => "defg" ),
array( "aa", "bb", "cc" => "def" ),
array( "a", "b", "c" => "def" ),
);
var_dump( array_unique( $array, SORT_REGULAR ) );