<?php $a = 5; $b = 7; $a = $a + $b; $b = $a - $b; $a = $a - $b; echo "a = ".$a."<br>"; echo "b = ".$b; ?>
<?php $array = array(5,8,9,15,145,854,64,1,3,8,46,9999,46); $max = max($array); $index = array_search($max , $array); echo $max."<br>".$index; ?>