What is the significance of isset($_REQUEST['varname']) in PHP?

The significance of isset($_REQUEST['varname']) in PHP is to check if a variable named 'varname' is set and not null in the request data. This is important for validating user input and preventing errors when trying to access undefined variables. 

if(isset($_REQUEST['varname'])){
    // variable 'varname' is set and not null
    $varname = $_REQUEST['varname'];
    // continue with processing the variable
} else {
    // handle case when 'varname' is not set or null
}

Keywords

isset $_REQUEST varname PHP significance

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