- print_r: documentation ( source)
- array_merge: documentation ( source)
- array_unique: documentation ( source)
<?php
$arr1 = array(array('path'=>'cola/loca/archivo'),array('path'=> 'otra cosa/mariposa'));
$arr2 = array(array('path'=>'cola/loca/archivo'),array('path'=>'cola/loca'));
$arr_result = array_unique(array_merge($arr1 , $arr2));
print_r($arr_result);