How to convert string to bool type in php

Conversion method: 1. Add the target type "(bool)" or "(boolean)" enclosed in parentheses before the string variable to be converted, the syntax is "(bool)$str" or " (boolean)$str"; 2. Use the boolval() function, the syntax is "boolval($str)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Method 1: In the computer to be converted The string variable is preceded by the target type (bool) or (boolean) enclosed in parentheses

<?php
header("Content-type:text/html;charset=utf-8");
$str="php中文网";
$a=(bool)$str;
$b=(boolean)$str;
var_dump($a);
var_dump($b);
?>

Output result:

Method 2: Use the boolval() function

boolval(): used to obtain the Boolean value of the variable;

<?php
header("Content-type:text/html;charset=utf-8");
$str="php中文网";
$bool=boolval($str);
var_dump($bool);
?>

Output result:

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