PHP empty() function

This function is used to check whether the variable is empty or not. If a variable does not exist, then it is considered to be empty.

Syntax

empty($varname);

This function always returns a boolean value, either true or false.

Example

<?php
    $var = 10;
    $var1;
    $var2 = 'false';
    $var3 = 'Hello World';
    if(empty($var)){
      echo 'First variable is empty.<br/>';
    }
    if(empty($var1)){
      echo 'Second variable is empty..<br/>';
    }
    if(empty($var2)){
      echo 'Third variable is empty.<br/>';
    }
    if(empty($var3)){
      echo 'Fourth variable is empty.<br/>';
    }
?>

Output:

Second variable is empty.




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