{"id":31454,"date":"2024-11-25T15:44:13","date_gmt":"2024-11-25T07:44:13","guid":{"rendered":"https:\/\/fwq.ai\/blog\/31454\/"},"modified":"2024-11-25T15:44:13","modified_gmt":"2024-11-25T07:44:13","slug":"php%e5%86%85%e5%ad%98%e9%87%8a%e6%94%be%e4%bb%a5%e5%8f%8a%e5%9e%83%e5%9c%be%e5%9b%9e%e6%94%b6%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/31454\/","title":{"rendered":"PHP\u5185\u5b58\u91ca\u653e\u4ee5\u53ca\u5783\u573e\u56de\u6536\u8be6\u89e3"},"content":{"rendered":"

\u672c\u6587\u4e3b\u8981\u7ed9\u5927\u5bb6\u5206\u4eab\u4e86\u5173\u4e8ephp\u5199\u7a0b\u5e8f\u7684\u5c0f\u6280\u5de7\uff0c\u5173\u4e8e\u5185\u5b58\u91ca\u653e\u4ee5\u53ca\u5783\u573e\u56de\u6536\u7684\u76f8\u5173\u95ee\u9898\uff0c\u6709\u5174\u8da3\u7684\u670b\u53cb\u5b66\u4e60\u4e0b\uff0c\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u5927\u5bb6\u3002<\/p>\n

\u5f15\u7528\u8d4b\u503c<\/strong><\/p>\n

<\/p>\n

$a = 'apple';\r\n$b = &amp;$a;<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u6211\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\u8d4b\u503c\u7ed9\u53d8\u91cfa\uff0c\u7136\u540e\u5c06a\u7684\u5f15\u7528\u8d4b\u503c\u7ed9\u4e86\u53d8\u91cfb\u3002\u663e\u7136\uff0c\u8fd9\u4e2a\u65f6\u5019\u7684\u5185\u5b58\u6307\u5411\u5e94\u8be5\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n
<\/p>\n
$a -&gt; 'apple' <p>a\u548cb\u6307\u5411\u4e86\u540c\u4e00\u5757\u5185\u5b58\u533a\u57df\uff0c\u6211\u4eec\u901a\u8fc7 var_dump($a, $b) \u5f97\u5230 string(5) \"apple\" string(5) \"apple\" \uff0c\u8fd9\u662f\u6211\u4eec\u9884\u671f\u7684\u7ed3\u679c\u3002<\/p><p><strong>unset \u51fd\u6570<\/strong><br><\/p><p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c<a href=\"https:\/\/pan.quark.cn\/s\/7fc7563c4182\" style=\"text-decoration: underline !important; color: blue; font-weight: bolder;\" rel=\"nofollow\" target=\"_blank\">PHP\u514d\u8d39\u5b66\u4e60\u7b14\u8bb0\uff08\u6df1\u5165\uff09<\/a>\u201d\uff1b<\/p><p>\u5047\u5982\u6211\u60f3\u5c06 'apple' \u8fd9\u4e2a\u5b57\u7b26\u4e32\u4ece\u5185\u5b58\u4e2d\u91ca\u653e\u6389\u3002\u6211\u662f\u8fd9\u4e48\u505a\u7684\uff1a<\/p><p class=\"jb51code\"><br><\/p><pre class=\"brush:php;toolbar:false\">unset($a);<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4f46\u662f\u901a\u8fc7\u518d\u6b21\u6253\u5370 $a $b \u4e24\u53d8\u91cf\u7684\u4fe1\u606f\uff0c\u6211\u5f97\u5230\u4e86\u8fd9\u6837\u7684\u7ed3\u679c\uff1aNotice: Undefined variable: a \u548c string(5) “apple” \u3002\u5947\u602a\uff0c$a $b \u540c\u65f6\u6307\u5411\u4e00\u5757\u5185\u5b58\u533a\u57df\uff0c\u53c8\u660e\u660e\u5c06$a\u91ca\u653e\u4e86\uff0c\u4e3a\u4ec0\u4e48$b\u8fd8\u662f’apple’\u3002<\/p>\n
\u5176\u5b9e\u662f\u8fd9\u6837\u7684\uff0cunset()\u8fd9\u662f\u5c06\u4e00\u4e2a\u53d8\u91cf\u6307\u9488\u9500\u6bc1\u4e86\uff0c\u5e76\u6ca1\u6709\u91ca\u653e\u6389\u90a3\u5757\u5185\u5b58\u533a\u57df\u4e2d\u5b58\u653e\u7684\u5b57\u7b26\u4e32\uff0c\u6240\u4ee5\u6267\u884c\u5b8c\u64cd\u4f5c\u4e4b\u540e\uff0c\u5185\u5b58\u6307\u5411\u53ea\u662f\u53d8\u6210\u4e86\u8fd9\u6837\uff1a<\/p>\n
<\/p>\n
'apple' <p>\u8981\u7262\u8bb0\u91cd\u70b9\uff1a unset\uff08\uff09\u5e76\u6ca1\u6709\u91ca\u653e\u53d8\u91cf\u6240\u6307\u5411\u7684\u90a3\u5757\u5185\u5b58\uff0c\u800c\u53ea\u662f\u5c06\u53d8\u91cf\u6307\u9488\u9500\u6bc1\u4e86\u3002\u540c\u65f6\uff0c\u5c06\u90a3\u5757\u5185\u5b58\u7684 \u5f15\u7528\u8ba1\u6570 \u51cf1\uff0c\u5f53\u5f15\u7528\u8ba1\u6570\u4e3a0\u65f6\uff0c\u4e5f\u5c31\u662f\u8bf4\u5f53\u90a3\u5757\u5185\u5b58\u4e0d\u88ab\u4efb\u4f55\u53d8\u91cf\u5f15\u7528\u65f6\uff0c\u4fbf\u4f1a\u89e6\u53d1php\u7684\u5783\u573e\u56de\u6536\u3002<\/p><p><strong>\u76f4\u63a5\u56de\u6536<\/strong><br><\/p><p>\u90a3\u8981\u600e\u6837\u505a\u624d\u80fd\u771f\u6b63\u91ca\u653e\u6389 'apple' \u6240\u5360\u7528\u7684\u5185\u5b58\u5462\uff1f<\/p><p>\u5229\u7528\u4e0a\u8ff0\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u5728 unset($a) \u4e4b\u540e\u518d unset($b) \uff0c\u5c06\u5185\u5b58\u533a\u57df\u7684\u6240\u6709\u5f15\u7528\u90fd\u9500\u6bc1\uff0c\u5f15\u7528\u8ba1\u6570\u51cf\u4e3a0\u4e86\uff0c\u81ea\u7136\u5c31\u88abphp\u56de\u6536\u4e86\u3002<\/p><p>\u5f53\u7136\uff0c\u8fd8\u6709\u66f4\u76f4\u63a5\u7684\u65b9\u6cd5\uff1a<\/p><p class=\"jb51code\"><br><\/p><pre class=\"brush:php;toolbar:false\">$a = null;<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u76f4\u63a5\u8d4b\u503c null \u4f1a\u5c06\u5c06 $a \u6240\u6307\u5411\u7684\u5185\u5b58\u533a\u57df\u7f6e\u7a7a\uff0c\u5e76\u5c06\u5f15\u7528\u8ba1\u6570\u5f52\u96f6\uff0c\u5185\u5b58\u4fbf\u88ab\u91ca\u653e\u3002<\/p>\n
\u811a\u672c\u6267\u884c\u7ed3\u675f<\/strong><\/p>\n
php\u662f\u811a\u672c\u8bed\u8a00\uff0c\u5f53\u811a\u672c\u6267\u884c\u7ed3\u675f\u4e4b\u540e\uff0c\u811a\u672c\u5185\u4f7f\u7528\u7684\u6240\u6709\u5185\u5b58\u90fd\u4f1a\u88ab\u91ca\u653e\u3002<\/p>\n
\u76f8\u5173\u63a8\u8350\uff1a<\/p>\n<\/p>\n<\/p>\n
<\/p>\n
<\/span><\/p>\n
\u4ee5\u4e0a\u5c31\u662fPHP\u5185\u5b58\u91ca\u653e\u4ee5\u53ca\u5783\u573e\u56de\u6536\u8be6\u89e3\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u672c\u6587\u4e3b\u8981\u7ed9\u5927\u5bb6\u5206\u4eab\u4e86\u5173\u4e8ephp\u5199\u7a0b\u5e8f\u7684\u5c0f\u6280\u5de7\uff0c\u5173\u4e8e\u5185\u5b58\u91ca\u653e\u4ee5\u53ca\u5783\u573e\u56de\u6536\u7684\u76f8\u5173\u95ee\u9898\uff0c\u6709\u5174\u8da3\u7684\u670b\u53cb\u5b66\u4e60\u4e0b\uff0c\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u5927\u5bb6\u3002 \u5f15\u7528\u8d4b\u503c $a = ‘apple’; $b = &amp;$a; \u767b\u5f55\u540e\u590d\u5236 \u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u6211\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\u8d4b\u503c\u7ed9\u53d8\u91cfa\uff0c\u7136\u540e\u5c06a\u7684\u5f15\u7528\u8d4b\u503c\u7ed9\u4e86\u53d8\u91cfb\u3002\u663e\u7136\uff0c\u8fd9\u4e2a\u65f6\u5019\u7684\u5185\u5b58\u6307\u5411\u5e94\u8be5\u662f\u8fd9\u6837\u7684\uff1a $a -&gt; ‘apple’ <p>a\u548cb\u6307\u5411\u4e86\u540c\u4e00\u5757\u5185\u5b58\u533a\u57df\uff0c\u6211\u4eec\u901a\u8fc7 var_dump($a, $b) \u5f97\u5230 string(5) “apple” string(5) “apple” \uff0c\u8fd9\u662f\u6211\u4eec\u9884\u671f\u7684\u7ed3\u679c\u3002<\/p><p><strong>unset \u51fd\u6570<\/strong><br><\/p><p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c<a href=”https:\/\/pan.quark.cn\/s\/7fc7563c4182″ style=”text-decoration: underline !important; color: blue; font-weight: bolder;” rel=”nofollow” target=”_blank”>PHP\u514d\u8d39\u5b66\u4e60\u7b14\u8bb0\uff08\u6df1\u5165\uff09<\/a>\u201d\uff1b<\/p><p>\u5047\u5982\u6211\u60f3\u5c06 ‘apple’ \u8fd9\u4e2a\u5b57\u7b26\u4e32\u4ece\u5185\u5b58\u4e2d\u91ca\u653e\u6389\u3002\u6211\u662f\u8fd9\u4e48\u505a\u7684\uff1a<\/p><p class=”jb51code”><br><\/p><pre class=”brush:php;toolbar:false”>unset($a); \u767b\u5f55\u540e\u590d\u5236 \u4f46\u662f\u901a\u8fc7\u518d\u6b21\u6253\u5370 $a $b \u4e24\u53d8\u91cf\u7684\u4fe1\u606f\uff0c\u6211\u5f97\u5230\u4e86\u8fd9\u6837\u7684\u7ed3\u679c\uff1aNotice: Undefined variable: a \u548c string(5) “apple” \u3002\u5947\u602a\uff0c$a $b \u540c\u65f6\u6307\u5411\u4e00\u5757\u5185\u5b58\u533a\u57df\uff0c\u53c8\u660e\u660e\u5c06$a\u91ca\u653e\u4e86\uff0c\u4e3a\u4ec0\u4e48$b\u8fd8\u662f’apple’\u3002 \u5176\u5b9e\u662f\u8fd9\u6837\u7684\uff0cunset()\u8fd9\u662f\u5c06\u4e00\u4e2a\u53d8\u91cf\u6307\u9488\u9500\u6bc1\u4e86\uff0c\u5e76\u6ca1\u6709\u91ca\u653e\u6389\u90a3\u5757\u5185\u5b58\u533a\u57df\u4e2d\u5b58\u653e\u7684\u5b57\u7b26\u4e32\uff0c\u6240\u4ee5\u6267\u884c\u5b8c\u64cd\u4f5c\u4e4b\u540e\uff0c\u5185\u5b58\u6307\u5411\u53ea\u662f\u53d8\u6210\u4e86\u8fd9\u6837\uff1a ‘apple’ <p>\u8981\u7262\u8bb0\u91cd\u70b9\uff1a unset\uff08\uff09\u5e76\u6ca1\u6709\u91ca\u653e\u53d8\u91cf\u6240\u6307\u5411\u7684\u90a3\u5757\u5185\u5b58\uff0c\u800c\u53ea\u662f\u5c06\u53d8\u91cf\u6307\u9488\u9500\u6bc1\u4e86\u3002\u540c\u65f6\uff0c\u5c06\u90a3\u5757\u5185\u5b58\u7684 \u5f15\u7528\u8ba1\u6570 \u51cf1\uff0c\u5f53\u5f15\u7528\u8ba1\u6570\u4e3a0\u65f6\uff0c\u4e5f\u5c31\u662f\u8bf4\u5f53\u90a3\u5757\u5185\u5b58\u4e0d\u88ab\u4efb\u4f55\u53d8\u91cf\u5f15\u7528\u65f6\uff0c\u4fbf\u4f1a\u89e6\u53d1php\u7684\u5783\u573e\u56de\u6536\u3002<\/p><p><strong>\u76f4\u63a5\u56de\u6536<\/strong><br><\/p><p>\u90a3\u8981\u600e\u6837\u505a\u624d\u80fd\u771f\u6b63\u91ca\u653e\u6389 ‘apple’ \u6240\u5360\u7528\u7684\u5185\u5b58\u5462\uff1f<\/p><p>\u5229\u7528\u4e0a\u8ff0\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u5728 unset($a) \u4e4b\u540e\u518d unset($b) \uff0c\u5c06\u5185\u5b58\u533a\u57df\u7684\u6240\u6709\u5f15\u7528\u90fd\u9500\u6bc1\uff0c\u5f15\u7528\u8ba1\u6570\u51cf\u4e3a0\u4e86\uff0c\u81ea\u7136\u5c31\u88abphp\u56de\u6536\u4e86\u3002<\/p><p>\u5f53\u7136\uff0c\u8fd8\u6709\u66f4\u76f4\u63a5\u7684\u65b9\u6cd5\uff1a<\/p><p […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-31454","post","type-post","status-publish","format-standard","hentry","category-19"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/31454","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=31454"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/31454\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=31454"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=31454"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=31454"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}