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31 lines
637 B
PHP
31 lines
637 B
PHP
<?php
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/**
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* Basic math functions.
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*
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* @author Jeff Moser <jeff@moserware.com>
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* @copyright 2010 Jeff Moser
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*/
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/**
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* Squares the input (x^2 = x * x)
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* @param number $x Value to square (x)
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* @return number The squared value (x^2)
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*/
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function square($x)
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{
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return $x * $x;
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}
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/**
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* Sums the items in $itemsToSum
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* @param array $itemsToSum The items to sum,
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* @param callback $callback The function to apply to each array element before summing.
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* @return number The sum.
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*/
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function sum(array $itemsToSum, $callback )
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{
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$mappedItems = array_map($callback, $itemsToSum);
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return array_sum($mappedItems);
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}
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?>
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