<?php 
$dizge ='kffğ*0ol08ıukıdo8[abk]prktc[/akk]dfıdo8[abk]ytktc[/akk]dfıdo8[abk]trktc[/akk]dfdffş09şhjgbnd';  
$kes = explode('[abk]',$dizge); 
for($i=1;$i<(count($kes)-1);$i++)
{
	$yeni = explode('[/akk]',$kes[$i]); 
	foreach($yeni as $b)
	{
		echo $b.'<br>'; 
	}
}
?>