PHP學習筆記—— PHP可變變量；

<?php

    $hello = "world";

    $$hello = "你好";

    echo $world; // 輸出的值是“你好”
           

<?php

    $hello = "world";

    $$hello = "name";

    $$$hello = "age";

    $$$$hello = "sex";

    echo $hello; // world
    echo"<br>";
    echo $$hello; // name
    echo"<br>";
    echo $$$hello; // age
    echo"<br>";
    echo $$$$hello; // sex
    echo"<br>";
    echo $world; // name
    echo"<br>";
    echo $age; // sex
           

變量的值前面加了$符，這個值就作為另一個變量名，可以有多層這種可變變量！
           

<?php


    $hello = "world";

    $abc$hello = "name"; // $abcworld 是不對的！

    $$hello = "name";

    $$$hello = "age";

    $$$$hello = "sex";

    echo $hello; // world
    echo"<br>";
    echo $$hello; // name
    echo"<br>";
    echo $$$hello; // age
    echo"<br>";
    echo $$$$hello; // sex
    echo"<br>";
    echo $world; // name
    echo"<br>";
    echo $age; // sex