11c03-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 46 行

<?php
// A function that will accept US SSNs
// and standardize them to xxx-xx-xxxx format.
function standardize_ssn($ssn) {
    // First, remove all non-digits from the string
    $s = preg_replace('/[^0-9]/', '', $ssn);
    
    // Now, break it into it's appropriate parts and insert dashes.
    return substr($s, 0, 3) . '-' . substr($s, 3, 2) . '-' . substr($s, 5);
}

// A function to check for SSN validity, requires a standardized number
function validate_ssn($ssn) {
    // First split the number into 3 parts:
    $parts = explode('-', $ssn);
    
    // If any part is all 0's - Invalid
    foreach ($parts as $p) {
        if ($p == 0) {
            return false;
        }
    }
    
    // If the first part is greater than 772 (May need updated in future)
    if ($parts[0] > 772) {
        return false;
    }
    
    // Finally, if the final part is not 4 characters, it is invalid
    if (strlen($parts[2]) != 4) {
        return false;
    }
    
    // Otherwise, we made it, it's valid.
    return true;
}

// Standardize & validate some SSN:
$ssn = array('774 35 4688', '354-00-0103', '123456789', 'Hello');
foreach ($ssn as $num) {
    $st = standardize_ssn($num);
    $valid = validate_ssn($st);
    $output = $valid ? 'Valid' : 'Invalid';
    echo "<p>{$st} - {$output}</p>\n";
}
?>