11c04-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 27 行

<?php
// A function that will accept and clean up number strings
function standardize_number($num, $precision = false) {
    // First, remove all non-digits, periods, and - signs from the string
    $num = preg_replace('/[^-.0-9]/', '', $num);
    
    // Now remove any -'s that are in the middle of the string:
    $num = preg_replace('/(?<=.)-/', '', $num);
    
    // We now have a valid string that PHP will properly consider a number.
    // If a precision was asked for, round accordingly:
    if ($precision !== false) {
        $num = round($num, $precision);
    }

    return $num;
}

// Standardize some number strings:
$nums = array('123.4643', 'Hello I bought 42 flowers for you.',
                '-344-345.424', '+544,342.566');
foreach ($nums as $num) {
    $st = standardize_number($num, 2);
    echo "<p>{$num} = {$st}</p>\n";
}
?>