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From: "M. Strobel" <sorry_no_mail_here@nowhere.dee>
Newsgroups: comp.lang.php
Subject: Re: Simpler way to validate form fields?
Date: Thu, 06 Dec 2012 17:50:01 +0100
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Am 06.12.2012 14:55, schrieb Gilles:
> On Thu, 06 Dec 2012 14:43:57 +0100, Gilles <nospam@nospam.com> wrote:
> 
>> function getDateFromForm($key, $l=8, $val=null) {
>> 		//Check for date DD/MM/YYYY
>>    return (isset($_POST[$key])) ?
>>          filter_var(substr($_POST[$key],0,$l),
>>
>> FILTER_VALIDATE_REGEXP,array("options"=>array("regexp"=>"/^\d{2}\/\d{2}\/\d{4}/"))
>> )
>>          : $val;
>> }
> 
> I made a mistake, but even after turning $_POST into $_GET, it still
> displays nothing:
> 
> function getDateFromForm($key, $l=8, $val=null) {
> 		//Check for date DD/MM/YYYY
>     return (isset($_GET[$key])) ?
>           filter_var(substr($_GET[$key],0,$l),
> 
> FILTER_VALIDATE_REGEXP,array("options"=>array("regexp"=>"/^\d{2}\/\d{2}\/\d{4}/"))
> )
>           : $val;
> }
> 
> //http://192.168.0.1/test.php?mydate=01/02/2012
> print getDateFromForm("mydate");

I don't know offhand what exactly PHP makes of your GET URL, but be aware that the
forward slash is a path separator.

The regex is okay. Find ways to quickly test code bits, or functions, if possible
just use the command line. My test (newlines inserted for reading):

php > $d = "01/01/2112";
php > echo filter_var($d,
FILTER_VALIDATE_REGEXP,array("options"=>array("regexp"=>"/^\d{2}\/\d{2}\/\d{4}/"))),
PHP_EOL;

01/01/2112

php > echo urlencode($d), PHP_EOL;

01%2F01%2F2112

Write regexp here with a different separator, easier to read:
array("regexp"=>"#^\d{2}/\d{2}/\d{4}#")

/Str.