In what ways can external scripts or configurations impact the behavior of PHP scripts and lead to unexpected results?

External scripts or configurations can impact the behavior of PHP scripts and lead to unexpected results by overriding default settings, introducing conflicting functions or variables, or altering the expected flow of the script. To mitigate this, it's important to carefully review and validate any external scripts or configurations before including them in your PHP code. 

// Example of validating and including an external script safely
$externalScript = 'external_script.php';

if (file_exists($externalScript)) {
    include $externalScript;
} else {
    echo 'External script not found.';
}

Keywords

external scripts configurations PHP scripts unexpected results impact

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