<?php
$a = '，';
echo 'strlen = '.strlen($a)."\n";

echo "\n==ASCII Codes==\n";
$b = str_split($a);
foreach($b as $x){
  echo ord($x)."\n";
}

echo "\n==str_replace==\n";
$c = '3602s，5300,5300XM，6126,6131，6131 NFC,6133,';
echo 'original string = '.$c."\n";
echo '_____new string = '.str_replace(chr(239).chr(188).chr(140), ',', $c);

strlen = 3

==ASCII Codes==
239
188
140

==str_replace==
original string = 3602s，5300,5300XM，6126,6131，6131 NFC,6133,
_____new string = 3602s,5300,5300XM,6126,6131,6131 NFC,6133,