02c01-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 31 行

<?php
// A function to retrieve the number from a string no matter what.
function retrieve_number($str) {
	// We need to do some cleanup of the string
	//  so remove anything that is not a digit, a period, or a -
	$str = preg_replace('/[^0-9.-]/', '', $str);
	
	// We can safely call floatval to convert this to a float and return
	return floatval($str);
}

// Setup our test cases:
$test1 = '$123,432.55';
$test2 = '  a  -57.2';

// Echo out these if just directly used as a float ...
// Displays the following:
// test1 = 0
// test2 = 0
echo '<pre>';
echo "\ntest1 = " . ($test1 * 1.0);
echo "\ntest2 = " . ($test2 * 1.0);

// Now use our new function:
// Displays the following:
// test1 = 123432.55
// test2 = -57.2
echo "\ntest1 = " . retrieve_number($test1);
echo "\ntest2 = " . retrieve_number($test2);
echo '</pre>';
?>