- print_r: documentation ( source)
- array_unique: documentation ( source)
<?php
$keys = array();
$keys[0] = "1/7/95";
$keys[1] = "1/7/95";
$keys[2] = "1/7/95";
$keys[3] = "1/7/95";
$keys[4] = "22/7/95";
$keys[5] = "22/7/95";
$keys[6] = "22/7/95";
$keys[7] = "11/7/95";
$keys[8] = "11/7/95";
$keys[9] = "11/7/95";
$keys[10] = "11/7/95";
$keys[11] = "main page";
$arr = array_unique($keys);
print_r($arr);