<?php
$a="eve,geldim";
$b="okuldan,geldim";
$dizi1=explode(",",$a);
$dizi2=explode(",",$b);
$fark=array_diff($dizi1,$dizi2);
$ayni=array_intersect($dizi1,$dizi2);
foreach($fark as $yaz)
       echo $yaz." ";
       
$fark1=array_diff($dizi2,$dizi1);
foreach($fark1 as $yaz1)
       echo $yaz1." ";       
       
foreach($ayni as $yaz2)
	        echo $yaz2." ";

?>