Parsing the Boolean type of PHP data type (Boolean)
This is the simplest type. boolean expresses a truth value and can be TRUE or FALSE.
Syntax
To specify a Boolean value, use the keywords TRUE or FALSE. Both are not case sensitive.
<?php $foo = True; // assign the value TRUE to $foo ?>
Usually the boolean value returned by the operator will be passed to the control flow.
<?php // == 是一个操作符,它检测两个变量是否相等,并返回一个布尔值 if ($action == "show_version") { echo "The version is 1.23"; } // 这样做是不必要的... if ($show_separators == TRUE) { echo "<hr>\n"; } // ...因为可以使用下面这种简单的方式: if ($show_separators) { echo "<hr>\n"; } ?>
Convert to Boolean
To explicitly convert a value to boolean, use (bool) or (boolean) to cast. But in many cases, casting is not necessary because when an operator, function, or flow control structure requires a boolean parameter, the value is automatically converted.
See the identification of type conversion.
When converted to boolean, the following values are considered FALSE:
Boolean value FALSE itself
Integer value 0 (zero)
Floating point value 0.0 (zero)
The empty string, and the string "0"
An array that does not include any elements
An object that does not include any member variables (only applicable to PHP 4.0)
Special type NULL (including variables that have not been assigned a value)
SimpleXML objects generated from XML documents without any tags
All All other values are considered TRUE (including any resources).
Warning
-1, like other non-zero values (positive or negative), is considered TRUE!
<?php var_dump((bool) ""); // bool(false) var_dump((bool) 1); // bool(true) var_dump((bool) -2); // bool(true) var_dump((bool) "foo"); // bool(true) var_dump((bool) 2.3e5); // bool(true) var_dump((bool) array(12)); // bool(true) var_dump((bool) array()); // bool(false) var_dump((bool) "false"); // bool(true) ?>
The above is the detailed content of Parsing the Boolean type of PHP data type (Boolean). For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

In this chapter, we will understand the Environment Variables, General Configuration, Database Configuration and Email Configuration in CakePHP.

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

To work on file upload we are going to use the form helper. Here, is an example for file upload.

In this chapter, we are going to learn the following topics related to routing ?

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

Validator can be created by adding the following two lines in the controller.
