Php empty () function

Write your php code

(PHP 3, PHP 4, PHP 5 )

empty -- Determine whether a variable is empty

Syntax

bool empty ( mixed var )

Determine whether a variable is considered to be empty.

Parameters

var

Variable to be checked

Note: empty() only checks variables as anything else will result in a parse error. In other words, the following will not work: empty(trim($name)).

empty() is the opposite of (boolean) var, except that no warning is generated when the variable is not set.

Return Values

Returns FALSE if var has a non-empty and non-zero value.

The following things are considered to be empty:

"" (an empty string)

0 (0 as an integer)

"0" (0 as a string)

NULL

FALSE

array() (an empty array)

var $var; (a variable declared, but without a value in a class)

ChangeLog

Version	Syntax
PHP 5	As of PHP 5, objects with no properties are no longer considered empty.
PHP 4	As of PHP 4, The string value "0" is considered empty.

Examples

Example 1. A simple empty() / isset() comparison.


<?php
$var = 0;

// Evaluates to true because $var is empty
if (empty($var)) {
    echo '$var is either 0, empty, or not set at all';
}

// Evaluates as true because $var is set
if (isset($var)) {
    echo '$var is set even though it is empty';
}
?>

Notes

Note: Because this is a language construct and not a function, it cannot be called using variable functions

Php empty Function syntax tag

empty php code on this is provided for your study purpose, it will guide you to know how create and design a website using php. use it to practice and train your self online

Php empty syntax tutorial

php tutorial guide and code design are for easy learning and programming. The code practice section provided at the top is for practising of this syntax. Use the code section up to practice your php programming online. Learning php is very easy, all you need is to use the examples on this site and practice them to perfect your skills.