How can PHP developers ensure that the variables used in included files have the correct values and do not cause errors in the script execution?

When including files in PHP, developers should ensure that the variables used in the included files have the correct values by passing them as parameters to the included files. This helps prevent conflicts or errors that may arise from variable scope or value mismatch. By passing variables as parameters, developers can maintain control over the values used in the included files and ensure smooth script execution. 

// main_script.php
$variable1 = "Hello";
$variable2 = "World";

include 'included_file.php';

// included_file.php
function displayVariables($var1, $var2) {
    echo $var1 . " " . $var2;
}

displayVariables($variable1, $variable2);

Keywords

include require variable scope global keyword error handling

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