How to convert string to integer in php

1. Forced type conversion method

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 
?>

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 
?>

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