我有一些字符串如下：
$str = "it is a test,it is a test";
$str = "it is a test ,it is a test";
$str = "it is a test, it is a test";
$str = "it is a test , it is a test";
现在我想要他们所有人都这样：
$str = "it is a test, it is a test";
现在，我可以通过几个步骤做到这一点：
str_replace(" , ",",","$str");str_replace(" ,",",","$str");str_replace(", ",",","$str");str_replace(",",", ","$str");
然后输出将是我想要的。现在我想知道，有没有REGEX代码可以一步到位？
您可以使用它并将其替换为,[space]
's*,'s*
即：
preg_replace('/'s*,'s*/', ', ', $str);