PHP版本的JavaScript函數...（郵編驗證）

Question

我正在尋找一種方式，PHP來實現這個...

var newPostCode = checkPostCode (document.getElementById('Postcode').value); 
    if (newPostCode) { 
    document.getElementById('Postcode').value = newPostCode; 
    return true; 
    } 
    else alert ("Postcode has invalid format"); 
    return false; 
} 

有問題的代碼使用HTML表單，以有效的郵政編碼，根據本網站的說明http://www.braemoor.co.uk/software/postcodes.shtml，但沒有關於如何調用PHP函數的說明，我只需要演示JavaScript方法。

當前的代碼是javascript，我只是最近才發現我的javascript函數可以很容易地被繞過。所以我現在正在尋找PHP來實現相同的，但服務器端。

Answer 1

<?php 
/*============================================================================== 
Application: Utility Function 
Author:  John Gardner 

Version:  V1.0 
Date:   25th December 2004 
Description: Used to check the validity of a UK postcode 

Version:  V2.0 
Date:   8th March 2005 
Description: BFPO postcodes implemented. 
       The rules concerning which alphabetic characters are alllowed in 
       which part of the postcode were more stringently implementd. 

Version:  V3.0 
Date:   8th August 2005 
Description: Support for Overseas Territories added    

Version:  V3.1 
Date:   23rd March 2008 
Description: Problem corrected whereby valid postcode not returned, and 
          'BD23 DX' was invalidly treated as 'BD2 3DX' (thanks Peter 
       Graves)    

Version:  V4.0 
Date:   7th October 2009 
Description: Character 3 extended to allow 'pmnrvxy' (thanks to Jaco de Groot)   

Version:  V4.1 
Date:   8th Septemeber 2011 
Description: ereg and ereg_replace replaced with preg_match and preg_replace 
       BFPO support improved 
       Add check for Anquilla 

Version:  V5.0 
Date:   8th November 2012 
       Specific support added for new BFPO postcodes 

Parameters: $postcode - postcode to be checked. This is returned reformatted 
       if valid. 

This function checks the value of the parameter for a valid postcode format. The 
space between the inward part and the outward part is optional, although is 
inserted if not there as it is part of the official postcode. 

The functions returns a value of false if the postcode is in an invalid format, 
and a value of true if it is in a valid format. If the postcode is valid, the 
parameter is loaded up with the postcode in capitals, and a space between the 
outward and the inward code to conform to the correct format. 

Example call: 

    if (!checkPostcode ($postcode)) { 
     echo 'Invalid postcode <br>'; 
    } 

------------------------------------------------------------------------------*/ 
function checkPostcode (&$toCheck) { 

    // Permitted letters depend upon their position in the postcode. 
    $alpha1 = "[abcdefghijklmnoprstuwyz]";       // Character 1 
    $alpha2 = "[abcdefghklmnopqrstuvwxy]";       // Character 2 
    $alpha3 = "[abcdefghjkpmnrstuvwxy]";       // Character 3 
    $alpha4 = "[abehmnprvwxy]";          // Character 4 
    $alpha5 = "[abdefghjlnpqrstuwxyz]";        // Character 5 
    $BFPOa5 = "[abdefghjlnpqrst]{1}";        // BFPO character 5 
    $BFPOa6 = "[abdefghjlnpqrstuwzyz]{1}";       // BFPO character 6 

    // Expression for BF1 type postcodes 
    $pcexp[0] = '/^(bf1)([[:space:]]{0,})([0-9]{1}' . $BFPOa5 . $BFPOa6 .')$/'; 

    // Expression for postcodes: AN NAA, ANN NAA, AAN NAA, and AANN NAA with a space 
    $pcexp[1] = '/^('.$alpha1.'{1}'.$alpha2.'{0,1}[0-9]{1,2})([[:space:]]{0,})([0-9]{1}'.$alpha5.'{2})$/'; 

    // Expression for postcodes: ANA NAA 
    $pcexp[2] = '/^('.$alpha1.'{1}[0-9]{1}'.$alpha3.'{1})([[:space:]]{0,})([0-9]{1}'.$alpha5.'{2})$/'; 

    // Expression for postcodes: AANA NAA 
    $pcexp[3] = '/^('.$alpha1.'{1}'.$alpha2.'{1}[0-9]{1}'.$alpha4.')([[:space:]]{0,})([0-9]{1}'.$alpha5.'{2})$/'; 

    // Exception for the special postcode GIR 0AA 
    $pcexp[4] = '/^(gir)([[:space:]]{0,})(0aa)$/'; 

    // Standard BFPO numbers 
    $pcexp[5] = '/^(bfpo)([[:space:]]{0,})([0-9]{1,4})$/'; 

    // c/o BFPO numbers 
    $pcexp[6] = '/^(bfpo)([[:space:]]{0,})(c\/o([[:space:]]{0,})[0-9]{1,3})$/'; 

    // Overseas Territories 
    $pcexp[7] = '/^([a-z]{4})([[:space:]]{0,})(1zz)$/'; 

    // Anquilla 
    $pcexp[8] = '/^ai-2640$/'; 

    // Load up the string to check, converting into lowercase 
    $postcode = strtolower($toCheck); 

    // Assume we are not going to find a valid postcode 
    $valid = false; 

    // Check the string against the six types of postcodes 
    foreach ($pcexp as $regexp) { 

    if (preg_match($regexp,$postcode, $matches)) { 

     // Load new postcode back into the form element 
      $postcode = strtoupper ($matches[1] . ' ' . $matches [3]); 

     // Take account of the special BFPO c/o format 
     $postcode = preg_replace ('/C\/O([[:space:]]{0,})/', 'c/o ', $postcode); 

     // Take acount of special Anquilla postcode format (a pain, but that's the way it is) 
     if (preg_match($pcexp[7],strtolower($toCheck), $matches)) $postcode = 'AI-2640';  

     // Remember that we have found that the code is valid and break from loop 
     $valid = true; 
     break; 
    } 
    } 

    // Return with the reformatted valid postcode in uppercase if the postcode was 
    // valid 
    if ($valid){ 
     $toCheck = $postcode; 
     return true; 
    } 
    else return false; 
} 
?> 

Answer 2

$newPostCode = checkPostCode($_POST['Postcode']); 
if ($newPostCode) { 
    // Do stuff with $newPostCode 
} else { 
    echo "Postcode has invalid format"; 
} 

你仍然需要編寫checkPostCode()功能。