How to convert string type number into real number type in PHP

PHP is a common web programming language that plays an important role in web development. Among them, digital transformation is one of the common requirements in web programming. This article will introduce how to use PHP to convert string type numbers into real number types.

Preparation

Before we start explaining the conversion logic, we need to first understand two concepts: strings and numbers. A string is a set of character sequences composed of any characters, while a number is an array composed of numeric characters, such as 1, 2, 3, etc. In PHP, strings and numbers are different data types. Therefore, before performing digital conversion, we need to ensure that the content to be converted is of string type.

Convert a string into a number

In PHP, there are several ways to convert a string into a number:

1. Use the intval() function

The intval() function can convert a string into an integer type.

For example:

$str = "123"; $num = intval($str); echo gettype($num);

The output result is:

integer

2. Use the floatval() function

The floatval() function can convert characters Convert string to floating point type.

For example:

$str = "123.7"; $num = floatval($str); echo gettype($num);

The output result is:

double

3. Use operators

The string can be converted to number. In this process, PHP will automatically convert the string into a number, and there is no need to use a function.

For example:

$str = "123.5"; $num = $str + 0; echo gettype($num);

The output result is:

double

Notes

In the process of converting strings into numbers, you need to pay attention to the following points :

1. The string can only contain numeric characters and decimal points.
2. If there are characters other than numeric characters and decimal points in the string, 0 will be returned.
3. If the string contains numbers in scientific notation, you need to use a special function for conversion.

Summary

Converting strings to numbers is one of the common requirements in PHP. In this article, we introduce three common conversion methods: using the intval() function, using the floatval() function, and using the operator. In actual development, we can choose different methods for conversion according to needs.

It should be noted that before conversion, it is necessary to ensure that the converted content is of string type, and the string only contains numeric characters and decimal points.

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