PHP remove commas from numeric strings

问题:

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 commas from strings, and ONLY do this for numeric strings. This isn't as straightforward as it looks. The main reason is that the following fails:

$a = "1,435";

if(is_numeric($a))
    $a = str_replace(',', '', $a);

This fails because $a = "1435" is numeric. But $a = "1,435" is not numeric. Because some of the strings I get will be regular sentences with commas, I can't run a string replace on every string.

回答1:

Not tested, but probably something like if(preg_match("/^[0-9,]+$/", $a)) $a = str_replace(...)

回答2:

Do it the other way around:

$a = "1,435";
$b = str_replace( ',', '', $a );

if( is_numeric( $b ) ) {
    $a = $b;
}

回答3:

The easiest would be:

$var = intval(preg_replace('/[^\d.]/', '', $var));

or if you need float:

$var = floatval(preg_replace('/[^\d.]/', '', $var));

回答4:

 function cleanData($a) {

     if(is_numeric($a)) {

     $a = preg_replace('/[^0-9,]/s', '', $a);
     }

     return $a;

}

回答5:

Try this .this worked for me

number_format(1235.369,2,'.','')

if you use number_format like this number_format(1235.369,2) answer will be 1,235.37

but if you use like below

number_format(1235.369,2,'.','') answer will be 1235.37

it's removing the "," of "1,235.37"

回答6:

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<nrs>[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"