❮ PHP Variable Handling Reference
Example
Check whether a variable is empty. Also check whether the variable is set/declared:
<?php
$a = 0;
// True because $a is empty
if (empty($a)) {
echo "Variable 'a' is empty.<br>";
}
// True because $a is set
if (isset($a)) {
echo "Variable 'a' is set";
}
?>
Try it Yourself »
Definition and Usage
The empty() function checks whether a variable is empty or not.
This function returns false if the variable exists and is not empty, otherwise it returns true.
The following values evaluates to empty:
- 0
- 0.0
- "0"
- ""
- NULL
- FALSE
- array()
Syntax
Parameter Values
| Parameter | Description |
| variable | Required. Specifies the variable to check |
Technical Details
| Return Value: | FALSE if variable exists and is not empty, TRUE otherwise |
| Return Type: | Boolean |
| PHP Version: | 4.0+ |
| PHP Changelog: | PHP 5.5: Support for expressions, not only variables
PHP 5.4: Non-numeric offsets of strings returns TRUE |
❮ PHP Variable Handling Reference
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They are not outdated but they are providing basic knowledge. You will get basic knowledge by reading on w3school and it is good for beginners. For advance you have to check each langauge official site and go through documents and their tutorials.
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Mainly what is wrong with W3Schools is that people take it for granted and do not realize that the whole site is better as a reference site rather than learning material for several reasons. One of the main reasons is lack of in depth explanations, outdated methodologies and old content.
A bit simplistic, and MDN is better, but its not bad. W3 has a bad reputation because, at least a long while ago, it was rife with blatantly false or misleading information. There's literally working code demos for everything on the site that's front-end or client-side.
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Start learning Data Analytics with the W3Schools program and lay the foundations of your programming skills. This program is a great foundation for you that wants to get started with Data Analytics. It covers Python, SQL, NumPy, Pandas, R, and Data Science. Python is a popular object oriented programming language.
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