PHP 从数字字符串中删除逗号 [英] PHP remove commas from numeric strings

问题描述

在 PHP 中，我有一个变量数组，它们都是字符串.一些存储的值是带逗号的数字字符串.

In PHP, I have an array of variables that are ALL strings. Some of the values stored are numeric strings with commas.

我需要什么:

一种从字符串中修剪逗号的方法，并且仅对数字字符串执行此操作.这并不像看起来那么简单.主要原因是以下失败:

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);

这失败了，因为 $a = "1435" 是数字.但是 $a = "1,435" 不是数字.因为我得到的一些字符串将是带逗号的常规句子，所以我无法对每个字符串运行字符串替换.

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.

推荐答案

未测试，但可能类似于 if(preg_match("/^[0-9,]+$/", $a)) $a = str_replace(...)

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

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