Quick Reference
The PHP empty keyword acts as a function which returns true if a variable does not exist, or if its value is considered empty. The empty keyword also evaluates expressions which are not in a variable.
A value is considered empty if its value is any of the following:
- An empty string
- An empty array
- The integer 0
- The floating point number 0.0
- The string “0”
- Boolean false null
<?php
$string = '';
if(empty($string)) {
echo 'The string is empty';
}
?>
Output
The string is empty
PHP Notes:
- When using PHP, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.