- PHP Tutorial
- PHP - Home
- PHP - Introduction
- PHP - Installation
- PHP - History
- PHP - Features
- PHP - Syntax
- PHP - Hello World
- PHP - Comments
- PHP - Variables
- PHP - Echo/Print
- PHP - var_dump
- PHP - $ and $$ Variables
- PHP - Constants
- PHP - Magic Constants
- PHP - Data Types
- PHP - Type Casting
- PHP - Type Juggling
- PHP - Strings
- PHP - Boolean
- PHP - Integers
- PHP - Files & I/O
- PHP - Maths Functions
- PHP - Heredoc & Nowdoc
- PHP - Compound Types
- PHP - File Include
- PHP - Date & Time
- PHP - Scalar Type Declarations
- PHP - Return Type Declarations
- PHP Operators
- PHP - Operators
- PHP - Arithmatic Operators
- PHP - Comparison Operators
- PHP - Logical Operators
- PHP - Assignment Operators
- PHP - String Operators
- PHP - Array Operators
- PHP - Conditional Operators
- PHP - Spread Operator
- PHP - Null Coalescing Operator
- PHP - Spaceship Operator
- PHP Control Statements
- PHP - Decision Making
- PHP - If…Else Statement
- PHP - Switch Statement
- PHP - Loop Types
- PHP - For Loop
- PHP - Foreach Loop
- PHP - While Loop
- PHP - Do…While Loop
- PHP - Break Statement
- PHP - Continue Statement
- PHP Arrays
- PHP - Arrays
- PHP - Indexed Array
- PHP - Associative Array
- PHP - Multidimensional Array
- PHP - Array Functions
- PHP - Constant Arrays
- PHP Functions
- PHP - Functions
- PHP - Function Parameters
- PHP - Call by value
- PHP - Call by Reference
- PHP - Default Arguments
- PHP - Named Arguments
- PHP - Variable Arguments
- PHP - Returning Values
- PHP - Passing Functions
- PHP - Recursive Functions
- PHP - Type Hints
- PHP - Variable Scope
- PHP - Strict Typing
- PHP - Anonymous Functions
- PHP - Arrow Functions
- PHP - Variable Functions
- PHP - Local Variables
- PHP - Global Variables
- PHP Superglobals
- PHP - Superglobals
- PHP - $GLOBALS
- PHP - $_SERVER
- PHP - $_REQUEST
- PHP - $_POST
- PHP - $_GET
- PHP - $_FILES
- PHP - $_ENV
- PHP - $_COOKIE
- PHP - $_SESSION
- PHP File Handling
- PHP - File Handling
- PHP - Open File
- PHP - Read File
- PHP - Write File
- PHP - File Existence
- PHP - Download File
- PHP - Copy File
- PHP - Append File
- PHP - Delete File
- PHP - Handle CSV File
- PHP - File Permissions
- PHP - Create Directory
- PHP - Listing Files
- Object Oriented PHP
- PHP - Object Oriented Programming
- PHP - Classes and Objects
- PHP - Constructor and Destructor
- PHP - Access Modifiers
- PHP - Inheritance
- PHP - Class Constants
- PHP - Abstract Classes
- PHP - Interfaces
- PHP - Traits
- PHP - Static Methods
- PHP - Static Properties
- PHP - Namespaces
- PHP - Object Iteration
- PHP - Encapsulation
- PHP - Final Keyword
- PHP - Overloading
- PHP - Cloning Objects
- PHP - Anonymous Classes
- PHP Web Development
- PHP - Web Concepts
- PHP - Form Handling
- PHP - Form Validation
- PHP - Form Email/URL
- PHP - Complete Form
- PHP - File Inclusion
- PHP - GET & POST
- PHP - File Uploading
- PHP - Cookies
- PHP - Sessions
- PHP - Session Options
- PHP - Sending Emails
- PHP - Sanitize Input
- PHP - Post-Redirect-Get (PRG)
- PHP - Flash Messages
- PHP AJAX
- PHP - AJAX Introduction
- PHP - AJAX Search
- PHP - AJAX XML Parser
- PHP - AJAX Auto Complete Search
- PHP - AJAX RSS Feed Example
- PHP XML
- PHP - XML Introduction
- PHP - Simple XML Parser
- PHP - SAX Parser Example
- PHP - DOM Parser Example
- PHP Login Example
- PHP - Login Example
- PHP - Facebook Login
- PHP - Paypal Integration
- PHP - MySQL Login
- PHP Advanced
- PHP - MySQL
- PHP.INI File Configuration
- PHP - Array Destructuring
- PHP - Coding Standard
- PHP - Regular Expression
- PHP - Error Handling
- PHP - Try…Catch
- PHP - Bugs Debugging
- PHP - For C Developers
- PHP - For PERL Developers
- PHP - Frameworks
- PHP - Core PHP vs Frame Works
- PHP - Design Patterns
- PHP - Filters
- PHP - JSON
- PHP - Exceptions
- PHP - Special Types
- PHP - Hashing
- PHP - Encryption
- PHP - is_null() Function
- PHP - System Calls
- PHP - HTTP Authentication
- PHP - Swapping Variables
- PHP - Closure::call()
- PHP - Filtered unserialize()
- PHP - IntlChar
- PHP - CSPRNG
- PHP - Expectations
- PHP - Use Statement
- PHP - Integer Division
- PHP - Deprecated Features
- PHP - Removed Extensions & SAPIs
- PHP - PEAR
- PHP - CSRF
- PHP - FastCGI Process
- PHP - PDO Extension
- PHP - Built-In Functions
- PHP Useful Resources
- PHP - Questions & Answers
- PHP - Quick Guide
- PHP - Useful Resources
- PHP - Discussion
PHP - boolval() Function
Definition and Usage
The boolval() function is a PHP inbuilt function. It gets the boolean value of a variable.
Syntax
bool boolval( mixed $value )
Parameters
Sr.No | Parameter & Description |
---|---|
1 |
value The scalar value being converted to a boolean value. It can be a string type, integer type, object and etc. *mixed: mixed indicates that a parameter may accept multiple (but not necessarily all) types |
Return Values
This function returns a boolean value (TRUE or FALSE). Below is a list of different variable types and their return value (TRUE or FLASE) on conversion to boolean value −
- integer − if value is 0 then boolval() returns false. For any other value returns true.
- float − if value is 0.0 then boolval() returns false. For any other value returns true.
- string − if string value is "0" and null then boolval() returns false. For any other value returns true (even "0.0").
- array − if value is empty array then boolval() returns false. For any other value returns true.
- object − if object is null then boolval() returns false. For any other value returns true.
- null − boolval() always returns false when variable is null.
Dependencies
PHP 5.5 and above
Example
Following example demonstrates return values with different types of variables −
<?php // PHP program demo for boolval() function echo 'boolval of 4: '.( boolval( 4 )? 'true' : 'false'); echo 'boolval of -4: '.( boolval( -4 )? 'true' : 'false'); echo 'boolval of 0: ' .( boolval( 0 )? 'true' : 'false'); echo 'boolval of 4.5: '.( boolval( 4.5 )? 'true' : 'false'); echo 'boolval of -4.5: '.( boolval( -4.5 )? 'true' : 'false' ); echo 'boolval of 0.0: '.( boolval( 0.0 )? 'true' : 'false' ); echo 'boolval of "1": '.( boolval( "1" )? 'true' : 'false' ); echo 'boolval of "0": '.( boolval( "0" )? 'true' : 'false' ); echo 'boolval of "0.0": '.( boolval( "0.0" )? 'true' : 'false' ); echo 'boolval of "abc": '.( boolval( "abc" )? 'true' : 'false' ); echo 'boolval of "": '.( boolval( "" )? 'true' : 'false' ); echo 'boolval of [2, 3]: '.( boolval( [1, 5] )? 'true' : 'false' ); echo 'boolval of []: '.( boolval( [] )? 'true' : 'false' ); echo 'boolval of NULL: '.( boolval( NULL )? 'true' : 'false' ); ?>
Output
This will produce following result −
boolval of 4: true boolval of -4: true boolval of 0: false boolval of 4.5: true boolval of -4.5: true boolval of 0.0: false boolval of "1": true boolval of "0": false boolval of "0.0": true boolval of "abc": true boolval of "": false boolval of [2, 3]: true boolval of []: false boolval of NULL: false
php_function_reference.htm
Advertisements
To Continue Learning Please Login
Login with Google