PHP ob_get_clean() Function

<?php

 // Create an output buffer
ob_start();

echo "Welcome to GeeksforGeeks";

$out = ob_get_clean();
$out = strtolower($out);

var_dump($out);
?>

<?php

// Declare a class 
class GFG {
    public function GFG_Funcion() {
        $variable = array(
            "A" => "Welcome",
            "B" => "GeeksforGeeks",
            "C" => "Geeks"
        );

        foreach ($variable as $key => $value) {
            echo $key . " => " . $value;
            echo "<br/>";
        }
    }
}

ob_start();

// Creating an object of class GFG
$object = new GFG();

// Calling function
$object -> GFG_Funcion();

$saved_ob_level = ob_get_level();

$start_ob_level="";

while (ob_get_level() > $start_ob_level) {
    ob_end_flush();
}

// Now, it is the final output buffer
$content = ob_get_clean();

?>