PHP | empty() Function

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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"); 
  
?> 