52 lines
1.3 KiB
PHP
52 lines
1.3 KiB
PHP
<?php
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namespace FluidTYPO3\Vhs\ViewHelpers\Math;
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/*
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* This file is part of the FluidTYPO3/Vhs project under GPLv2 or later.
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*
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* For the full copyright and license information, please read the
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* LICENSE.md file that was distributed with this source code.
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*/
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/**
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* Math: Median
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*
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* Gets the median value from an array of numbers. If there
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* is an odd number of numbers the middle value is returned.
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* If there is an even number of numbers an average of the
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* two middle numbers is returned.
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*
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* @author Claus Due <claus@namelesscoder.net>
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* @package Vhs
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* @subpackage ViewHelpers\Math
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*/
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class MedianViewHelper extends AbstractSingleMathViewHelper {
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/**
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* @return mixed
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* @throw Exception
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*/
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public function render() {
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$a = $this->getInlineArgument();
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$aIsIterable = $this->assertIsArrayOrIterator($a);
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if (TRUE === $aIsIterable) {
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$a = $this->arrayFromArrayOrTraversableOrCSV($a);
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sort($a, SORT_NUMERIC);
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$size = count($a);
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$midpoint = $size / 2;
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if (1 === $size % 2) {
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/*
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* Array indexes of float are truncated to integers,
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* not everybody knows, let's make it explicit for everybody
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* wondering.
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*/
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return $a[(integer) $midpoint];
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}
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$candidates = array_slice($a, floor($midpoint) - 1, 2);
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return array_sum($candidates) / 2;
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}
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return $a;
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}
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}
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