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php.js - empty function - php.js Tutorial

php.js : empty() function

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Description

The empty() function checks whether a variable is empty or not and returns true or false.

Version

1103.1210

Syntax

empty(var_name)

Parameters

Name Description Required /
Optional
Type
var_name The variable to be checked. Required Mixed*

*Mixed : Mixed indicates that a parameter may accept multiple (but not necessarily all) types.

Example of php.js empty() function

In the following web document empty() function checks whether a value is empty or not.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>php.js : empty() function example</title>
<script type="text/javascript" src="../../phpjs/variable/variable.min.js"> </script>
</head>
<body>
<h1 style="color: green">php.js : empty() function example</h1>
<h3>Test whether a value is empty or not.</h3>
<hr />
<script type="text/javascript">
//This is done to make the following JavaScript code compatible to XHTML. <![CDATA[
document.write("empty('')"+'<br />');
document.write(empty('')+'<br />');
document.write("empty(null)"+'<br />');
document.write(empty(null)+'<br />');
//]]>
</script>
</body>
</html>

Output of the function

empty('')
true
empty(null)
true

View example of php.js empty() function in browser

Download phpjs.zip



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