PHP | empty() Function
Last Updated :
20 Jun, 2018
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
$var1 = 0;
$var2 = 0.0;
$var3 = "0" ;
$var4 = NULL;
$var5 = false;
$var6 = array ();
$var7 = "" ;
empty ( $var1 ) ? print_r( "True\n" ) : print_r( "False\n" );
empty ( $var2 ) ? print_r( "True\n" ) : print_r( "False\n" );
empty ( $var3 ) ? print_r( "True\n" ) : print_r( "False\n" );
empty ( $var4 ) ? print_r( "True\n" ) : print_r( "False\n" );
empty ( $var5 ) ? print_r( "True\n" ) : print_r( "False\n" );
empty ( $var6 ) ? print_r( "True\n" ) : print_r( "False\n" );
empty ( $var7 ) ? print_r( "True\n" ) : print_r( "False\n" );
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
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