3v4l.org

run code in 300+ PHP versions simultaneously
<?php $SESSION=array(); $POST=array(); $SESSION[0]='asd'; $SESSIONS[1]='bsa'; $POST['auth']='ololo'; $POST['auth1']='ololos'; $SESSION = array_replace($SESSION, $POST); print_r($SESSION);

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35.58 ms | 402 KiB | 5 Q