How to convert string to integer in php

How to convert a string to an integer in php: You can use the built-in function intval() to achieve this, such as [$foo = "1";intval($foo);]. It can also be achieved through forced type conversion, such as [(int)$foo;].

1. Forced type conversion method

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The forced type conversion method is the method of "adding the target type enclosed in parentheses before the variable to be converted".

<?php 
$foo = "1"; // $foo 是字符串类型 
$bar = (int)$foo; // $bar 是整型 
?>

For integers, the cast type name is int or integer.

2. Built-in function method

The built-in function method uses PHP's built-in function intval to convert variables.

<?php 
$foo = "1"; // $foo 是字符串类型 
$bar = intval($foo); // $bar 是整型 
?>

3. Formatted string method

The formatted string method uses sprintf's %d to format the specified variable to achieve the purpose of type conversion.

<?php 
$foo = "1"; // $foo 是字符串类型 
$bar = sprintf("%d", $foo); // $bar 是字符串类型 
?>

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