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$a = 'hello'; //ÆÕͨ±äÁ¿
$$a = 'world'; //¿É±ä±äÁ¿ £¬Ï൱ÓÚ $hello='world';
echo "$a $hello"; //Êä³ö£ºhello world
echo $$a; //Êä³ö£ºworld
echo "$a ${$a}"; //Êä³ö£ºhello world
echo "$a {$$a}"; //Êä³ö£ºhello world
?>
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$a = 'hello'; //ÆÕͨ±äÁ¿
$$a = 'world'; //¿É±ä±äÁ¿£¬Ï൱ÓÚ $hello='world';
echo "$a $hello"; //Êä³ö£ºhello world
echo $$a; //Êä³ö£ºworld
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?>
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$var1="this is var1";
$var2="this is var2";
$a="var1";
echo $$a; //Êä³ö this is var1
$a="var2";
echo $$a; //Êä³ö this is var2
?>
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$var1="this is var1";
$var2="this is var2";
$a="var1";
echo $$a; //Êä³ö this is var1
$a="var2";
echo $$a; //Êä³ö this is var2
?>
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