Check if number is within range - either open or closed one.

inRange.php

<?php
	/*! Checks if numer is within range
		*  @param    numeric $number number to check
		*  @param    arr $range array in format [min, max, 'open' => bool]
		*  @return   Boolean result
		*  @ingroup  math
		*  @version  1
		*  @note     It's very simple, but I've seen a lot of examples which used range() and in_array() which is wrong wrong wrong. Also most of them support only open ranges.
	*/
	function inRange($number, $range) {
		if (!is_numeric($number)) return false;
		$number = floatval($number);
		$range['open'] = $range['open'] ?? true; // for PHP6 change it to: $range['open'] = isset($range['open']) ? $range['open'] : true;
		if ($range['open'] && $number >= $range[0] && $number <= $range[1]) return true;
		if (!$range['open'] && $number > $range[0] && $number < $range[1]) return true;	
		return false;
	}
	

inRange_example.php

<?php
inRange(4, [1, 4]); // true
inRange(4, [1, 4, 'open' => false]); // false