<?php

$e = 'baglanti = "123"
kullanici = "345"
sifre = "678"
veri = <unset>';

preg_match_all('/([^\=\s]+)\s?\=\s([^\=\s]+)?/', $e, $m);

echo '<pre>';
print_r($m[1]);
print_r($m[2]);
echo '</pre>';

?>