02c07-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 8 行

<?php
// A Library to provide the conversion between different units of measure

// Declare an array of metric prefixes.  Each value is the power of 10
// each prefix stands for over the base unit.
$metric_prefixes = array( 'Y' => 24, 'Z' => 21, 'E' => 18, 'P' => 15, 
	'T' => 12, 'G' => 9, 'M' => 6, 'k' => 3, 'h' => 2, 'da' => 1, '' => 0, 
	'd' => -1, 'c' => -2, 'm' => -3, '