How can one ensure that variables from included files do not conflict with variables in the main PHP file?

To ensure that variables from included files do not conflict with variables in the main PHP file, you can use namespaces or wrap the included code in a function to limit the scope of the variables. This way, variables from the included files will not overwrite or be overwritten by variables in the main PHP file. 

// Example using namespaces
namespace IncludedNamespace {
    $includedVar = "This is a variable from the included file.";
}

// Main PHP file
$mainVar = "This is a variable from the main file.";

// Accessing variables from included file
echo IncludedNamespace\$includedVar;
echo $mainVar;

Keywords

variable scope include_once namespace global keyword function encapsulation

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