String manipulation

owaring

just a quickie, had a hunt and a search but to no avail,

how do i manipulate a string to make it contain only numbers??

$var = 56789098h3j783bhnjd8383

becomes

$var = 5678909837838383

cheers!!

ta ta!😃

TheDefender

There's probably other ways to do this, but it's how I would do it personally...

$var = "56789098h3j783bhnjd8383";

function only_numbers($var){

$totals = strlen($var);
$varfinal = "";
for($i = 0; $i < $totals; $i++){
    if(is_numeric($var[$i])){
        $varfinal .= $var[$i];
    }
}
return $varfinal;
}

// Usage:
echo only_numbers($var);

// Outputs: 5678909837838383

Shrike

$str = "123abc123";
echo preg_replace("/[a-z]+/si", "", $str);

🙂

Roger_Ramjet

I would have thought str_replace would be the way to go.

$var = "56789098h3j783bhnjd8383";
$chars = array(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z); 
$blanks = array();
$only_numbers = str_replace($chars. $blanks, $var);

Edit: and of course as I wrote this, someone posted a better answer. But I learnt a string function I did not know about.

dewen

$str = "12-33ab,c12+3xvc34#@45v44";
if (preg_match_all("/[0-9]+/", $str, $matches)){
echo implode('', $matches[0]);
}

TheDefender

Well, hopefully through all of this, you found something you can use. As you can see, there are multiple ways to get it done. (I avoid preg_replace personally, because I am not up to speed on it, but it is definitely a better way to go.)

Sidenote: Hey Roger, you can use the [man]range()[/man] function to define an alphabetical array you know. Just makes it easier in case you weren't aware; Here's a snippet of how to do it:

//Instead of:
$chars = array(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z);  

//Use:
$chars = range("a", "z");

Roger_Ramjet

Thanks Defender. I've been wondering how to do that in php. I'm used to the vb form [a-z].

dewen

this should be even better:

$str = "12-33ab,c12+3xvc34#@45v44";
echo preg_replace("/[^0-9]+/", '', $str);