PHP pass variable to include

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You can use the extract() function
Drupal use it, in its theme() function.

Here it is a render function with a $variables argument.

function includeWithVariables($filePath, $variables = array(), $print = true)
{
    $output = NULL;
    if(file_exists($filePath)){
        // Extract the variables to a local namespace
        extract($variables);

        // Start output buffering
        ob_start();

        // Include the template file
        include $filePath;

        // End buffering and return its contents
        $output = ob_get_clean();
    }
    if ($print) {
        print $output;
    }
    return $output;

}

./index.php :

includeWithVariables('header.php', array('title' => 'Header Title'));

./header.php : 

<h1><?php echo $title; ?></h1>

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