Руководство по PHP
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abs

(PHP 3, PHP 4 , PHP 5)

abs -- Absolute value

Description

number abs ( mixed number)

Returns the absolute value of number. If the argument number is of type float, the return type is also float, otherwise it is integer (as float usually has a bigger value range than integer).

Пример 1. abs() example

<?php
$abs = abs(-4.2); // $abs = 4.2; (double/float)
$abs2 = abs(5);   // $abs2 = 5; (integer)
$abs3 = abs(-5);  // $abs3 = 5; (integer)
?>
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