php - get the number from a string then do the calculation -

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i have string this

$coordinate = "coords='429, 457, 421, 460, 424, 464, 433, 465, 433, 460'";

i want multiply numbers 2, how can write simple php code calculation this?

this new $coordinate should be

coords="858, 914, 842, 920, 848, 928, 866, 930, 866, 920"

my orriginal string "alt='japan' shape='poly' coords='429, 457, 421, 460, 424, 464, 433, 465, 433, 460'";

something like:

$coords="429, 457, 421, 460, 424, 464, 433, 465, 433, 460"; $coords_arr = explode(",", $coords); array_walk($coords_arr, 'alter');  function alter(&$val) {     $val *= 2; //multiply 2 } print_r($coords_arr);

updated code::

$coordinate = "coords='429, 457, 421, 460, 424, 464, 433, 465, 433, 460'"; $arr = explode("=", $coordinate); $data = trim($arr[1], "'"); //remove quotes start , end $coords=explode(",", $data);  array_walk($coords, 'alter');  function alter(&$val) {     $val = (int) $val * 2; } echo "<pre>"; print_r($coords);

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