[SOLVED] Check if string contains anything other than numbers.

[Warptweet]

I have some forms on my site, and some of them require that you can only type in numbers, that means no decimals either. How can I check a string to see if it contains letters, decimals, or any of those complicated signs. AKA: Check if theres anything other than numbers 1-9

 

Thank you so much for any help!

[corbin]

if(preg_match('/^[0-9]+$')) {

    //1 or more numbers

}

[teng84]

if(preg_match('/^[0-9]+$')) {

    //1 or more numbers

}

 

nope easier way

 

ctype_digit(texthere)

[Warptweet]

Thanks both of you. I used tengs method because I actually understood his, but thanks corbin too for trying.

[corbin]

Ahhh, mine was just a regular expression....

 

I didn't think to use teng's method....

 

Extending on teng's, you could also do:

 

$input = $_POST['input'];
$iinput = (int) $input;
if($input != $iinput) {
     //not numeric
}

 

That might cause PHP to throw a notice or warning though....  Not sure.

[teng84]

Ahhh, mine was just a regular expression....

 

I didn't think to use teng's method....

 

Extending on teng's, you could also do:

 

$input = $_POST['input'];
$iinput = (int) $input;
if($input != $iinput) {
     //not numeric
}

 

That might cause PHP to throw a notice or warning though....  Not sure.

 

wont work because int will remove ZERO in front of your string right?

eg.. this will give  (int)' 0005'  >>>5

 

 

[corbin]

Ohhh good call....  Didn't think of that....

 

I guess you could ltrim($input, '0') and then compare, but that would be much slower.....  Hmmm....

 

I hadn't ever heard of ctype_digit before hehe....

[teng84]

yah.. ctype data is cool 

[corbin]

It's also extremely fast....  It took half the time as converting the input to int and left trimming 0s on my comp.

 

It even beat:

$iput = (int) $input;

if($iput == 0 && $input != 0) {

}

 

By .09 seconds with 100,000 runs....

[revraz]

Or is_numeric

[teng84]

Or is_numeric

nope it will accept decimals 

is_numeric(0.343); // true

[corbin]

You could use is_numeric and strpos($input, '.').

 

Oddly enough, is_numeric combined with strpos is like .0001 seconds faster when the input isn't numeric, but when it is numeric, thus it has to continue to the strpos check, it's like 2.2 times slower lol....