VALIDATE 5 DIGIT NUMBER

[nikko50]

Hi all.
I'm trying to validate that $x is a 5 digit number. Why does it always echo FAILED?

$x = "123456";

if (preg_match('/^{\d{5}$/',$x])){}

echo "PASSED";

} else {

echo "FAILED";

}

[nikko50]

I believe the function is correct. The problem lies with my SWITCH statement. It always evaluates to the default statement. What am I doing wrong??

$x = "123456";

switch ($x) {
case preg_match('/^{\d{5}$/',$x):}
$num = "3";
break;
default:
$num = "0";
break;

                                  }

[sneakyimp]

You have a couple of problems.
1) 123456 is a 6-digit number, not a five digit number.
2) Your switch statement is useless. Under no circumstances is "123456" equal to preg_match('/^\d{5}$/', "123456"). In fact, the only value for $x I can think of where $x == preg_match('/^\d{5}$/',$x) is 0.

You may find this helpful:

$x = "123456";
echo preg_match('/^\d{6}$/',$x) . "<br>";
switch (preg_match('/^\d{6}$/',$x)) {
	case 1:
		$num = "3";
		break;
	default:
		$num = "0";
}
echo $num . '<br>';

[nrg_alpha]

Hey Nikko (you wouldn't be the star of GTA 4 by any chance, would you? j/k)

I tired this and it seems to work:

$x = "12345";

if(ereg('^[0-9]{5}$', $x)){
     echo "true";
} else {
     echo "false";
}					

Would this serve your purpose?

Cheers,

NRG

[NogDog]

I would stick with an if/else for something with only 2 choices, or even use the "?:" operator:

$num = (ctype_digit($x) and strlen($x) == 5) ? 3 : 0 ;

[nrg_alpha]

NogDog wrote:

I would stick with an if/else for something with only 2 choices, or even use the "?:" operator:

$num = (ctype_digit($x) and strlen($x) == 5) ? 3 : 0 ;

Nice one Nog..

Everytime I think I have a nice clean and simple solution, someone comes along and destroys mine with something far sleeker and more elegant. Never even knew about the 'ctype_digit()' function...

Damn I have much to learn :queasy:

Cheers,

NRG

[NogDog]

If using a reasonably up-to-date version of PHP, be sure to check out the [man]filter[/man] functions for a whole set of useful data validation mechanisms via the [man]filter_var/man function.

[nrg_alpha]

NogDog wrote:

If using a reasonably up-to-date version of PHP, be sure to check out the [man]filter[/man] functions for a whole set of useful data validation mechanisms via the [man]filter_var/man function.

I am using version 5.1.2 here at home when developing for localhost..
I think my hosting service might be using a version even higher..

So thanks again Nog.. nice to know about the collection of validation mechanisms..

If we were at a bar right now, I'd buy you a drink!

Cheers,

NRG