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$a = 'abc'; //杩欓噷閲嶇疆浜?a
echo $b; //灏嗚緭鍑篴bc
unset($a);//鍙栨秷寮曠敤
echo $b;//杩欓噷浠嶈緭鍑篴bc
$a = 'abcd';
echo $b;//鍥犱负宸茬粡鍙栨秷寮曠敤 杩欓噷浠嶈緭鍑篴bc
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