| Re: Simpler way to validate form fields? [message #179804 is a reply to message #179801] |
Thu, 06 December 2012 16:55   |
M. Strobel
Messages: 386
Registered: December 2011
Karma:
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Senior Member |
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Am 06.12.2012 17:50, schrieb Gilles:
> On Thu, 06 Dec 2012 14:55:51 +0100, Gilles <nospam(at)nospam(dot)com> wrote:
>> 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}/ "))
>> )
>> : $val;
>> }
>>
>> //http://192.168.0.1/test.php?mydate=01/02/2012
>> print getDateFromForm("mydate");
>
> Turns out I should have used "/^\d{2}\/\d{2}\/\d{4}$/". Regardless,
> this doesn't check that the date looks kosher, eg. 99/99/9999 is
> considered OK, so it looks like it's loetter to use something else
> such as:
>
> if (DateTime::createFromFormat('d/m/Y', $string))
The date verification problems are a all time favorite in programming.
But to the regular expression: they just pick the pattern where they find it, so this
is always a tolerant and save input reading. You might as well leave off the ^ and $
delimiters.
/Str.
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