PHP如何将字符串转换为数字?

How do I convert a string to a number in PHP?(PHP如何将字符串转换为数字?)

问题描述

我想将这些类型的值，'3'、'2.34'、'0.234343'等转换成数字.在 JavaScript 中我们可以使用 Number()，但在 PHP 中是否有类似的方法?

I want to convert these types of values, '3', '2.34', '0.234343', etc. to a number. In JavaScript we can use Number(), but is there any similar method available in PHP?

Input             Output
'2'               2
'2.34'            2.34
'0.3454545'       0.3454545

推荐答案

有以下几种方法:

1. 将字符串转换为数字原始数据类型:

1. Cast the strings to numeric primitive data types:

$num = (int) "10";
$num = (double) "10.12"; // same as (float) "10.12";

$num = "10" + 1;
$num = floor("10.1");

$num = intval("10");
$num = floatval("10.1");