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PHP - empty() Function
Definition and Usage
The empty() function checks whether a variable is empty.
Syntax
bool empty ( mixed $var )
Parameters
Sr.No | Parameter & Description |
---|---|
1 |
var Variable to be checked. *mixed: mixed indicates that a parameter may accept multiple (but not necessarily all) types |
Return Values
This function returns −
true − if the variable is empty
false − if variable exists or has a non-empty or non-zero value
The following values evaluates to empty −
integer − if value is 0 then empty() returns true. For any other value returns false.
float − if value is 0.0 then empty() returns true. For any other value returns false.
string − if string value is "0" and null ("") then empty() returns true. For any other value returns false (even "0.0").
array − if value is empty array() then boolval() returns true. For any other value returns false.
NULL − empty() always returns false when variable is NULL.
Boolean − if boolean variable is FALSE then empty() returns true.
Dependencies
PHP 4.0 and above. Prior to PHP 5.5, empty() only supports variables; anything else will result in a parse error.
Example
Following example demonstrates return values with different types of variables −
<?php // PHP program demo for empty() function echo 'when var is 0 function empty() returns <b>'.( empty( 0 )? 'true' : 'false').'</b>'; echo 'when var is "0.0" function empty() returns <b>'.( empty( "0.0" )? 'true' : 'false').'</b>'; echo 'when var is "0" function empty() returns <b>'.( empty( "0" )? 'true' : 'false').'</b>'; echo 'when var is "" function empty() returns <b>'.( empty( "" )? 'true' : 'false').'</b>'; echo 'when var is [] function empty() returns <b>'.( empty( [] )? 'true' : 'false').'</b>'; echo 'when var is NULL function empty() returns <b>'.( empty( NULL )? 'true' : 'false').'</b>'; echo 'when var is FALSE function empty() returns <b>'.( empty( FALSE )? 'true' : 'false').'</b>'; ?>
Output
This will produce following result −
when var is 0 function empty() returns true when var is "0.0" function empty() returns false when var is "0" function empty() returns true when var is "" function empty() returns true when var is [] function empty() returns true when var is NULL function empty() returns true when var is FALSE function empty() returns true
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