gistfile1.php

<?php

$word = "Stefane ides u kurac stefane pusis kurac samo kurac da da da!";

$split = explode(" ", strtolower($word));

$map = array();

foreach ($split as $v) {
    if (isset($map[$v])) {
        $map[$v]++;
    } else {
        $map[$v] = 1;
    }
}
asort($map);
print_r($map);

Output

dig@dev:tmp$ php test.php 
Array
(
    [pusis] => 1
    [samo] => 1
    [da!] => 1
    [u] => 1
    [ides] => 1
    [da] => 2
    [stefane] => 2
    [kurac] => 3
)