寻找一种方法从字符串中删除一个尾随逗号只有当有一个PHP [重复]

问题描述：

Possible Duplicate:
PHP - Remove last character if it’s a period?

I am trying to strip a trailing comma from a string. I do it like this:

$_POST['city_id_list'] //looks like 1,4,213,
$trimmed = substr(trim($_POST['city_id_list']),0,-1);

But what if the last character is not a comma?

java has something like:

str.replaceAll(" ,$", "")

I assume there is a way to do this with PHP. What is the best way to do it?

可能重复： strong>
PHP - 删除最后一个字符（如果是一段时间？） p> blockquote>

我试图从字符串中删除尾随逗号。我是这样做的： p>

$ _ POST ['city_id_list'] //看起来像1,4,213， $ trimmed = substr（trim（$ _ POST ['city_id_list' ]），0，-1）; code> pre> 但如果最后一个字符不是逗号怎么办？ p> java有类似于： p> str.replaceAll（“，$”，“”） code> pre> 我假设有用PHP做到这一点的方法。最好的方法是什么？ p> div>

答

Take a look at the rtrim function:

$trimmed = rtrim($_POST['city_id_list'], ',');

寻找一种方法从字符串中删除一个尾随逗号只有当有一个PHP [重复]

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