PHP remove commas from numeric strings

Question

In PHP, I have an array of variables that are ALL strings. Some of the values stored are numeric strings with commas.

What I need:

A way to trim the comma

Answer 1

If you want to remove commas from numbers inside a string that also contains words, the easiest way I think would be to use preg_replace_callback:

Example:  

$str = "Hey hello, I've got 12,500 kudos for you, spend it well"

function cleannr($matches)
{
    return str_replace("," , "" , $matches["nrs"]);
}

$str = preg_replace_callback ("/(?P[0-9]+,[0-9]+)/" , "cleannr" , $str);

Output:

"Hey hello, I've got 12500 kudos for you, spend it well"

In this case the pattern (regex) differs from the one given in the accepted answer since we don't want to remove the other commas (punctuation).

If we'd use /[0-9,]+/ here instead of /[0-9]+,[0-9]+/ the output would be:

"Hey hello I've got 12500 kudos for you spend it well"