<?php

    $x=5; // 全局变量

    function myTest()

    {

    $y=10; // 局部变量

    echo "<p>Test variables inside the function:<p>";

    echo "Variable x is: ";

    echo "<br>";

    echo "Variable y is: $y";

    } 

    myTest();

    echo "<p>Test variables outside the function:<p>";

     echo "Variable x is: $x";

    echo "<br>";

    echo "Variable y is: ";

    ?>