filter_has_var function to check variable in the PHP script

filter_has_var

filter_has_var function checks the variable available or not. The same result can be achieved by using isset() function also but the advantage of filter_has_var is it checks the specified type of input ( source ) is available or not. If we expect the variable to be available by POST method and not by GET method for form posting then the same can be checked by using filter_has_var function in PHP. Here is the syntax

bool filter_has_var(TYPE, variable_name);

Here is one example

<?php
if(filter_has_var(INPUT_GET,'REMOTE_ADDR')){
echo "Yes true $_GET[book_id]";
}else{
echo "No false $_GET[book_id]";
}
?>

The above code will display the status of book_id variable is available through GET method only. ( file_name.php?book_id=3 )
The possible type of availability are

INPUT_POST, 
INPUT_GET, 
INPUT_COOKIE,
INPUT_SERVER, 
INPUT_ENV

fillter_has_var is a better way than isset() function to to check the existence of a variable

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