11c02-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 48 行

<?php
// A function that will accept US zip codes
// and standardize them to xxxxx-xxxx format.
function standardize_zip($input) {
    // First, remove all non-digits from the string
    $digits = preg_replace('/[^0-9]/', '', $input);
    
    // Grab the first five digits:
    $ret = substr($digits, 0, 5);
    
    // If there are more than 5, then include the rest after a dash
    if (strlen($digits) > 5) {
        $ret .= '-' . substr($digits, 5);
    }
    
    return $ret;
}

// A function to check for zip code validity
// It must have been standardized first.
function validate_zip($input) {
    // First split the number into 2 parts:
    $parts = explode('-', $input);
    
    // If the first part is not 5 digits - Invalid
    if (strlen($parts[0]) != 5) {
        return false;
    }
    
    // If the second part exists, and is not 4 digits - Invalid
    if (isset($parts[1]) && (strlen($parts[1]) != 4)) {
        return false;
    }

    // Otherwise, we made it, it's valid.
    return true;
}

// Standardize & validate some zips:
$zips = array('21771', '7177', 'x234 56', '12345-6789', '1313122', 
    '14142-77743', '21705-123', '2177-1234', '1-1', '7.42');
foreach ($zips as $num) {
    $st = standardize_zip($num);
    $valid = validate_zip($st);
    $output = $valid ? 'Valid' : 'Invalid';
    echo "<p>{$st} - {$output}</p>\n";
}
?>