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Reduction

array_sum($arr) returns the sum of the values in $arr. array_product($arr) returns the product of the values in $arr. array_reduce($arr, $f(&$m1, $m2)[,$m3=NULL]) returns a single value obtained by applying $f to the elements in $arr iteratively, with $m3 being the initial value. 

<!DOCTYPE html><html><head></head>
<body>
<?php
function minus($result, $item){
   return ($result-$item);
}
$a=[1,2,3,4,5];
echo array_sum($a); echo "<br />";
echo array_product($a); echo "<br />";
echo array_reduce($a,'minus',100);
?> 
</body></html>

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