session not working in iframe

add this line on the top of php file

<?php header("p3p: CP="ALL DSP COR PSAa PSDa OUR NOR ONL UNI COM NAV");?>

or
<?php header('P3P: CP="IDC DSP COR CURa ADMa OUR IND  
 PHY ONL COM STA"'); ?>

or

header('P3P:CP="IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT"');

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