The empty() function is an inbuilt function in PHP which is used to check whether a variable is empty or not.
bool empty ( $var )
Parameter: This function accepts a single parameter as shown in above syntax and described below.
- $var: Variable to check whether it is empty or not.
Note: Below version of PHP 5.5, empty() only supports variables, anything other will result in a parse error. The following statement will not work empty(trim($var)). Instead, use trim($name) == false.
Return Value: It returns FALSE when $var exists and has a non-empty, non-zero value. Otherwise it returns TRUE.
These values are considered to be as an empty value:
- “” (an empty string)
- 0 (0 as an integer)
- 0.0 (0 as a float)
- “0” (0 as a string)
- array() (an empty array)
Below program illustrate the empty() function in PHP:
True True True True True True True True
Reference : http://php.net/manual/en/function.empty.php