{"id":30780,"date":"2023-12-03T23:09:21","date_gmt":"2022-12-05T11:47:12","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/php%e7%b2%89%e4%b8%9d%e6%92%ad%e5%ae%a2\/"},"modified":"2025-08-12T20:47:23","modified_gmt":"2025-08-12T12:47:23","slug":"php%e7%b2%89%e4%b8%9d%e6%92%ad%e5%ae%a2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/php%e7%b2%89%e4%b8%9d%e6%92%ad%e5%ae%a2\/","title":{"rendered":"PHP\u7c89\u4e1d\u64ad\u5ba2"},"content":{"rendered":"

\u9996\u5148<\/h1>\n

\u8fd9\u662f\u6211\u521d\u6b21\u6295\u7a3f\u3002
\n\u56e0\u4e3a\u5bf9\u4e8ePHP\u5b57\u7b26\u4e32\u53ca\u5176\u4ed6\u6bd4\u8f83\u7684\u8f6c\u6362\u4e0d\u592a\u660e\u767d\uff0c\u6240\u4ee5\u6211\u81ea\u5df1\u603b\u7ed3\u4e86\u4e00\u4e0b\u3002<\/p>\n

\u4e0d\u662f\u4e00\u4e2a\u6545\u969c\uff0c\u800c\u662f\u8bbe\u8ba1\u8981\u6c42\u3002<\/h1>\n
if<\/span> (<\/span>\"3aaaaa\"<\/span> ==<\/span> 3<\/span>)<\/span> \r\n{<\/span>\r\n    echo<\/span> \"true\"<\/span>;<\/span>\r\n}<\/span>\r\nelse<\/span>\r\n{<\/span>\r\n    echo<\/span> \"false\"<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u90a3\u4e48\u7ed3\u679c\u4f1a\u662f\u4ec0\u4e48\u6837\u5462\uff1f
\n\u7ed3\u679c\u4f1a\u662f\uff5e<\/p>\n
\u6211\u6700\u521d\u5f88\u60ca\u8bb6\uff0c\u4f46\u4f3c\u4e4e\u8fd9\u662f\u7531\u4e8ePHP\u7684\u89c4\u5b9a\u3002<\/p>\n
\u5f53\u5728PHP\u4e2d\u8fdb\u884c\u4e0d\u540c\u7c7b\u578b\u7684\u6bd4\u8f83\uff0c\u5982\u5b57\u7b26\u4e32\u7c7b\u578b\u548c\u6570\u503c\u7c7b\u578b\uff0c\u5b57\u7b26\u4e32\u5c06\u4f1a\u88ab\u8f6c\u6362\u4e3a\u6570\u503c\u578b\u3002<\/p><\/blockquote>\n
\u7531\u4e8e\u8fd9\u4e2a\u89c4\u8303\uff0c\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6574\u6570\u3002<\/p>\n
echo<\/span> (<\/span>int<\/span>)<\/span>\"3aaaaaaa\"<\/span>;<\/span>    \/\/3 \u3068\u51fa\u529b\u3055\u308c\u308b<\/span>\r\necho<\/span> (<\/span>int<\/span>)<\/span>\"hoge\"<\/span>;<\/span>        \/\/0 \u3068\u51fa\u529b\u3055\u308c\u308b<\/span>\r\necho<\/span> (<\/span>int<\/span>)<\/span>\"01aaaaa\"<\/span>;<\/span>     \/\/1 \u3068\u51fa\u529b\u3055\u308c\u308b<\/span>\r\necho<\/span> (<\/span>int<\/span>)<\/span>\"   01db\"<\/span>;<\/span>     \/\/1 \u3068\u51fa\u529b\u3055\u308c\u308b<\/span>\r\n<\/code><\/pre>\n
\u6839\u636e\u663e\u793a\uff0c\u53ef\u4ee5\u770b\u51fa\u89d2\u8272\u4e5f\u6709\u89c4\u5b9a\u3002<\/p>\n
\u5982\u679c\u5b57\u7b26\u4e32\u7684\u5f00\u5934\u662f\u6570\u5b57\uff0c\u5219\u5c06\u8be5\u6570\u5b57\u63d0\u53d6\u51fa\u6765\uff0c
\n\u5426\u5219\u5c06\u5176\u8bbe\u4e3a0\u3002
\n\u6ce8\u610f\uff0c\u5f00\u5934\u7684\u7a7a\u683c\u62160\u5c06\u88ab\u5ffd\u7565\u3002<\/p>\n
\u6709\u4e9b\u4f8b\u5916\u60c5\u51b5\u7684\u5b58\u5728\u3002\u3002\u3002<\/p>\n
\u53ea\u9700\u8981\u4e00\u79cd\u9009\u9879\uff1a\u4f8b\u5916\u3002<\/h2>\n
\u5982\u679c\u5b57\u7b26\u4e32\u662f\u4ee5\u6570\u503c\u5f62\u5f0f\u8868\u793a\u7684\u8bdd<\/p>\n
if<\/span> (<\/span>\"3.0\"<\/span> ==<\/span> \"3\"<\/span>)<\/span> {<\/span>\r\n    echo<\/span> \"true\"<\/span>;<\/span>\r\n}<\/span>else<\/span>{<\/span>\r\n    echo<\/span> \"false\"<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7ed3\u679c\u662f\u771f\u7684\u3002<\/p>\n
if<\/span> (<\/span>\"3e0\"<\/span> ==<\/span> \"3\"<\/span>)<\/span> {<\/span>\r\n    echo<\/span> \"true\"<\/span>;<\/span>\r\n}<\/span>else<\/span>{<\/span>\r\n    echo<\/span> \"false\"<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7ed3\u679c\u4e3a\u771f\u3002<\/p>\n
\u54ce\u5440~\u602a\u4e86\u5462~\u7528\u5f15\u53f7\uff08””\uff09\u62ec\u8d77\u6765\u6240\u4ee5\u5e94\u8be5\u662f\u5b57\u7b26\u4e32\u7684\uff0c\u53ef\u662f\uff5e\uff5e\u8fd9\u4e5f\u662f\u7c7b\u578b\u8f6c\u6362\u7684\u89c4\u5b9a\u3002<\/p>\n
\u5728PHP\u4e2d\uff0c\u5f53\u6bd4\u8f83\u6570\u503c\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u65f6\uff0c\u5b83\u4eec\u4f1a\u88ab\u6bd4\u8f83\u4e3a\u6574\u6570\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5373\u4f7f\u662f\u5b57\u7b26\u4e32\u7c7b\u578b\u548c\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u6bd4\u8f83\uff0c\u53ea\u8981\u6bd4\u8f83\u5bf9\u8c61\u90fd\u662f\u6570\u503c\u683c\u5f0f\uff08\u53ef\u4ee5\u88ab\u89e3\u91ca\u4e3a\u6570\u5b57\u7684\u5b57\u7b26\u4e32\uff09\uff0c\u5c31\u4f1a\u88ab\u89c6\u4e3a\u6574\u6570\u7c7b\u578b\u7684\u6bd4\u8f83\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e9b\u88ab\u89c6\u4e3a\u6570\u5b57\u7684\u5b57\u7b26\u4e32\uff1a
\n“123” \u2190 \u53ea\u6709\u6570\u5b57
\n“3.0” \u2190 \u5c0f\u6570\u70b9
\n“-6” \u2190 \u8d1f\u6570
\n“0003” \u2190 \u4ee50\u5f00\u5934\uff0c\u540e\u9762\u662f\u7eaf\u6570\u5b57
\n“1e3” \u2190 \u79d1\u5b66\u8ba1\u6570\u6cd5\u8868\u793a\u7684\u6d6e\u70b9\u6570
\n“0x3A” \u2190 \u5341\u516d\u8fdb\u5236\u6570<\/p>\n
\u5f88\u591a\u76840<\/h1>\n
if<\/span> (<\/span> null<\/span> ==<\/span> false<\/span>)<\/span> {<\/span>\r\n    echo<\/span> \"true\"<\/span>;<\/span>\r\n}<\/span>else<\/span>{<\/span>\r\n    echo<\/span> \"false\"<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
if<\/span> (<\/span> 0<\/span> ==<\/span> \"\"<\/span>)<\/span> {<\/span>\r\n    echo<\/span> \"true\"<\/span>;<\/span>\r\n}<\/span>else<\/span>{<\/span>\r\n    echo<\/span> \"false\"<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7ed3\u679c\u4e24\u8005\u90fd\u662ftrue\uff0c\u867d\u7136\u5f88\u96be\u7406\u89e3true\u5143\u7d20\u5728\u54ea\u91cc\uff0c\u4f46\u8fd9\u4e5f\u662f\u7c7b\u578b\u8f6c\u6362\u7684\u539f\u56e0\u3002\u6240\u6709\u7684\u5143\u7d20\u90fd\u88ab\u8f6c\u6362\u4e3a0\uff0c\u6240\u4ee5\u662ftrue\u3002\u771f\u662f\u592a\u7cdf\u7cd5\u4e86\u3002<\/p>\n
\u9632\u6cbb\u63aa\u65bd<\/h1>\n
    \n
  • \n
      \u6bd4\u8f03\u306a\u3069\u3092\u3059\u308b\u969b\u306f\u5fc5\u305a\u201d\u201d(\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3)\u3067\u56f2\u3046\u306a\u3069\u578b\u3092\u610f\u8b58\u3057\u3066\u4f7f\u3046<\/ul>\n<\/li>\n<\/ul>\n
      \u4f8b\u5916\u306a\u3069\u3092\u9664\u304d\u3042\u308b\u7a0b\u5ea6\u3053\u308c\u3067\u5bfe\u7b56\u3067\u304d\u308b<\/p>\n
      ===(\u30a4\u30b3\u30fc\u30eb\u30a4\u30b3\u30fc\u30eb\u30a4\u30b3\u30fc\u30eb)\u3092\u4f7f\u3046<\/p>\n
      ===\u306f$a\u304c$b\u306b\u7b49\u3057\u304f\u3001\u304a\u3088\u3073\u540c\u3058\u578b\u3067\u3042\u308b\u5834\u5408\u306btrue\u3068\u306a\u308b\u306e\u3067\u578b\u5909\u63db\u304c\u884c\u308f\u308c\u305a\u6bd4\u8f03\u304c\u884c\u308f\u308c\u308b\u3002
      \n\u4f46\u3057\u4f55\u3082\u8003\u3048\u305a\u3059\u3079\u3066===\u3092\u4f7f\u7528\u3059\u308b\u3068\u52d5\u7684\u578b\u4ed8\u3051\u8a00\u8a9e\u3067\u3042\u308bPHP\u3068\u3057\u3066\u306f\u5c11\u3005\u3082\u3063\u305f\u3044\u306a\u3044\u306e\u3067\u9069\u6750\u9069\u6240==\u3068===\u3092\u4f7f\u3044\u5206\u3051\u308b\u3002<\/p>\n
      \u56e0\u6b64\uff0c\u5f53\u4f7f\u7528”===”\u65f6\uff0c\u4e0a\u8ff0\u7684\u6240\u67090\u503c\u90fd\u4f1a\u88ab\u5b8c\u5168\u5904\u7406\uff0c\u7ed3\u679c\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
      \n
      ==nullfalse\u201c\u201d0nulltruetruetruetruefalsetruetruetruetrue””truetruetruetrue0truetruetruetrue<\/div>\n<\/div>\n
      \u5168\u90e8\u90fd\u662f\u771f\u5b9e\u7684\u3002<\/p>\n
      \n
      ===nullfalse\u201c\u201d0nulltrue<\/span>falsefalsefalsefalsefalsetrue<\/span>falsefalse””falsefalsetrue<\/span>false0falsefalsefalsetrue<\/span><\/div>\n<\/div>\n
      \u88ab\u533a\u5206\u3002<\/p>\n
      Summary-\u603b\u7ed3<\/h1>\n
      \u30fb\u5f53\u8fdb\u884c\u5b57\u7b26\u4e32\u578b\u4e0e\u6570\u503c\u578b\u7684\u6bd4\u8f83\u65f6\uff0c\u5b57\u7b26\u4e32\u578b\u4f1a\u88ab\u5f3a\u5236\u8f6c\u6362\u4e3a\u6570\u503c\u578b\u3002
      \n\u30fb\u5f53\u8fdb\u884c\u5b57\u7b26\u4e32\u578b\u4e0e\u5b57\u7b26\u4e32\u578b\u7684\u6bd4\u8f83\u65f6\uff0c\u5982\u679c\u4e24\u8005\u90fd\u662f\u6570\u503c\u5f62\u5f0f\uff0c\u5c06\u4f1a\u88ab\u5f3a\u5236\u8f6c\u6362\u4e3a\u6570\u503c\u578b\u3002
      \n\u30fb\u5728\u4f7f\u7528”==”\u548c”===”\u65f6\u8981\u6ce8\u610f\u533a\u522b\uff0c\u5c24\u5176\u662f\u5728\u6bd4\u8f83null\u3001false\u3001””\u548c0\u65f6\uff0c\u56e0\u4e3a”==”\u4f1a\u628a\u5b83\u4eec\u90fd\u5f3a\u5236\u8f6c\u6362\u4e3a”0″\uff0c\u5bfc\u81f4\u6bd4\u8f83\u7ed3\u679c\u4e3atrue\u3002
      \n-\u8981\u4f7f\u7528”===”\u8fdb\u884c\u6bd4\u8f83\uff0c\u907f\u514d\u8fdb\u884c\u5f3a\u5236\u8f6c\u6362\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u9996\u5148 \u8fd9\u662f\u6211\u521d\u6b21\u6295\u7a3f\u3002 \u56e0\u4e3a\u5bf9\u4e8ePHP\u5b57\u7b26\u4e32\u53ca\u5176\u4ed6\u6bd4\u8f83\u7684\u8f6c\u6362\u4e0d\u592a\u660e\u767d\uff0c\u6240\u4ee5\u6211\u81ea\u5df1\u603b\u7ed3\u4e86\u4e00\u4e0b\u3002 \u4e0d\u662f\u4e00\u4e2a\u6545\u969c\uff0c\u800c […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-30780","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"\nPHP\u7c89\u4e1d\u64ad\u5ba2 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8ePHP\u7c89\u4e1d\u64ad\u5ba2\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/php\u7c89\u4e1d\u64ad\u5ba2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PHP\u7c89\u4e1d\u64ad\u5ba2\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8ePHP\u7c89\u4e1d\u64ad\u5ba2\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/php\u7c89\u4e1d\u64ad\u5ba2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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