- Tags: Keyword
- Categories: PHP Keywords, PHP Reference, Reference
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';
}
?>
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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
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