The empty() function is an inbuilt function in PHP which is used to check whether a variable is empty or not.
Syntax:
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)
- NULL
- FALSE
- array() (an empty array)
Below program illustrate the empty() function in PHP:
<?php // PHP code to demonstrate working of empty() function $var1 = 0;
$var2 = 0.0;
$var3 = "0";
$var4 = NULL;
$var5 = false;
$var6 = array();
$var7 = "";
// for value 0 as integer empty($var1) ? print_r("True\n") : print_r("False\n");
// for value 0.0 as float empty($var2) ? print_r("True\n") : print_r("False\n");
// for value 0 as string empty($var3) ? print_r("True\n") : print_r("False\n");
// for value Null empty($var4) ? print_r("True\n") : print_r("False\n");
// for value false empty($var5) ? print_r("True\n") : print_r("False\n");
// for array empty($var6) ? print_r("True\n") : print_r("False\n");
// for empty string empty($var7) ? print_r("True\n") : print_r("False\n");
// for not declare $var8 empty($var8) ? print_r("True\n") : print_r("False\n");
?> |
Output:
True True True True True True True True
Reference : http://php.net/manual/en/function.empty.php