计数字符串中位数的功能

本文介绍了计数字符串中位数的功能的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在寻找一种快速的PHP函数，给定一个字符串，该函数将计算该字符串中数字字符(即数字)的数量.我找不到一个，是否有执行此操作的功能?

I was looking for a quick PHP function that, given a string, would count the number of numerical characters (i.e. digits) in that string. I couldn't find one, is there a function to do this?

推荐答案

可以使用正则表达式轻松实现.

This can easily be accomplished with a regular expression.

function countDigits( $str ) { return preg_match_all( "/[0-9]/", $str ); }

该函数将返回找到模式的次数，在这种情况下，该数字为任何数字.

The function will return the amount of times the pattern was found, which in this case is any digit.