{"id":27421,"date":"2024-11-24T19:24:37","date_gmt":"2024-11-24T11:24:37","guid":{"rendered":"https:\/\/fwq.ai\/blog\/?p=27421"},"modified":"2024-11-24T19:24:37","modified_gmt":"2024-11-24T11:24:37","slug":"php%e4%b8%ad%e7%b1%bb%e4%b8%8e%e5%af%b9%e8%b1%a1%ef%bc%88%e4%b8%80%ef%bc%89","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/27421\/","title":{"rendered":"PHP\u4e2d\u7c7b\u4e0e\u5bf9\u8c61\uff08\u4e00\uff09"},"content":{"rendered":"<p><strong>1\u3001new\u7684\u51e0\u79cd\u65b9\u5f0f<\/strong><\/p>\n<pre>$obj = new ClassName();\r\n$obj = new ClassName;\r\n$obj = new $obj;\r\n\r\n$className = 'Foo';\r\n$obj = new $className;<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>2\u3001new self\u3001new static\u3001new parent\u7684\u533a\u522b<\/strong><\/p>\n<p>\u7b49\u5f85\u8865\u5145<\/p>\n<p><strong>3\u3001extends \u2013 \u7ee7\u627f<\/strong><\/p>\n<ul>\n<li>PHP\u4e0d\u652f\u6301\u591a\u91cd\u7ee7\u627f\uff0c\u4e00\u4e2a\u7c7b\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u57fa\u7c7b\u3002<\/li>\n<li>\u88ab\u7ee7\u627f\u7684\u65b9\u6cd5\u548c\u5c5e\u6027\u53ef\u4ee5\u901a\u8fc7\u7528\u540c\u6837\u7684\u540d\u5b57\u91cd\u65b0\u58f0\u660e\u88ab\u8986\u76d6\u3002\u4f46\u662f\u5982\u679c\u7236\u7c7b\u5b9a\u4e49\u65b9\u6cd5\u65f6\u4f7f\u7528\u4e86 final\uff0c\u5219\u8be5\u65b9\u6cd5\u4e0d\u53ef\u88ab\u8986\u76d6\u3002\u53ef\u4ee5\u901a\u8fc7 parent:: \u6765\u8bbf\u95ee\u88ab\u8986\u76d6\u7684\u65b9\u6cd5\u6216\u5c5e\u6027\u3002<\/li>\n<li>\u5f53\u8986\u76d6\u65b9\u6cd5\u65f6\uff0c\u53c2\u6570\u5fc5\u987b\u4fdd\u6301\u4e00\u81f4\u5426\u5219 PHP \u5c06\u53d1\u51fa E_STRICT \u7ea7\u522b\u7684\u9519\u8bef\u4fe1\u606f\u3002\u4f46\u6784\u9020\u51fd\u6570\u4f8b\u5916\uff0c\u6784\u9020\u51fd\u6570\u53ef\u5728\u88ab\u8986\u76d6\u65f6\u4f7f\u7528\u4e0d\u540c\u7684\u53c2\u6570\u3002<\/li>\n<\/ul>\n<p><strong>4\u3001::class<\/strong><\/p>\n<p>\u81ea PHP 5.5 \u8d77\uff0c\u5173\u952e\u8bcd class \u4e5f\u53ef\u7528\u4e8e\u7c7b\u540d\u7684\u89e3\u6790\u3002\u4f7f\u7528 ClassName::class \u4f60\u53ef\u4ee5\u83b7\u53d6\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5305\u542b\u4e86\u7c7b ClassName \u7684\u5b8c\u5168\u9650\u5b9a\u540d\u79f0\u3002\u8fd9\u5bf9\u4f7f\u7528\u4e86 \u547d\u540d\u7a7a\u95f4 \u7684\u7c7b\u5c24\u5176\u6709\u7528\u3002<\/p>\n<p><strong>5\u3001\u5c5e\u6027\u3001\u65b9\u6cd5\u3001\u5bf9\u8c61\u7684\u8bbf\u95ee\u63a7\u5236\u53ca\u53ef\u89c1\u6027<\/strong><\/p>\n<p>\u5c5e\u6027\u521d\u59cb\u5316\u7684\u503c\u5fc5\u987b\u662f\u5e38\u6570\uff0c\u8fd9\u91cc\u7684\u5e38\u6570\u662f\u6307 PHP \u811a\u672c\u5728\u7f16\u8bd1\u9636\u6bb5\u65f6\u5c31\u53ef\u4ee5\u5f97\u5230\u5176\u503c\uff0c\u800c\u4e0d\u4f9d\u8d56\u4e8e\u8fd0\u884c\u65f6\u7684\u4fe1\u606f\u624d\u80fd\u6c42\u503c\u3002<\/p>\n<p>Note: \u4e3a\u4e86\u517c\u5bb9\u6027\u8003\u8651\uff0c\u5728 PHP 4 \u4e2d\u4f7f\u7528 var \u5173\u952e\u5b57\u5bf9\u53d8\u91cf\u8fdb\u884c\u5b9a\u4e49\u7684\u65b9\u6cd5\u5728 PHP 5 \u4e2d\u4ecd\u7136\u6709\u6548\uff08\u53ea\u662f\u4f5c\u4e3a public \u5173\u952e\u5b57\u7684\u4e00\u4e2a\u522b\u540d\uff09\u3002\u5728 PHP 5.1.3 \u4e4b\u524d\u7684\u7248\u672c\uff0c\u8be5\u8bed\u6cd5\u4f1a\u4ea7\u751f\u4e00\u4e2a E_STRICT \u8b66\u544a\u3002<\/p>\n<p><strong>6\u3001\u81ea\u52a8\u52a0\u8f7d<\/strong><\/p>\n<p>9\u3001\u62bd\u8c61\u7c7b<\/p>\n<p>10\u3001\u63a5\u53e3\u7c7b \uff0d interface<\/p>\n<p><strong>11\u3001trait \u2013 \u7279\u5f81\u7c7b<\/strong><\/p>\n<ul>\n<li>trait\u7c7b\u548c\u7ee7\u627f\u76f8\u6bd4\uff0c\u7ee7\u627f\uff08extends\uff09\u662f\u7eb5\u5411\u6269\u5c55\uff0ctrait\u662f\u6a2a\u5411\u6269\u5c55(\u6c34\u5e73\u6269\u5c55)\uff1b<\/li>\n<li>\u7279\u5f81\u7c7b\u4f7f\u7528use\uff0c\u591a\u4e2atrait\u7c7b\u4f7f\u7528,\u5206\u9694<\/li>\n<li>\u4f18\u5148\u987a\u5e8f\u662f\u6765\u81ea\u5f53\u524d\u7c7b\u7684\u6210\u5458 &gt; trait \u7684\u65b9\u6cd5 &gt; \u88ab\u7ee7\u627f\u7684\u65b9\u6cd5\u3002<\/li>\n<li>\u4f7f\u7528insteadof \u3001as\u6765\u89e3\u51b3\u4f7f\u7528\u591a\u4e2a\u7279\u5f81\u7c7b\u65f6\uff0c\u5b58\u5728\u7684\u51b2\u7a81\u65b9\u6cd5\u3002\u4f8b\u5982\uff1a<code>\u00a0B::smallTalk\u00a0insteadof\u00a0A;<\/code><code>B::bigTalk\u00a0as\u00a0talk;<\/code><\/li>\n<li>\u4f7f\u7528\u00a0<em>as<\/em>\u00a0\u8bed\u6cd5\u8fd8\u53ef\u4ee5\u7528\u6765\u8c03\u6574\u65b9\u6cd5\u7684\u8bbf\u95ee\u63a7\u5236\uff0c\u4f8b\u5982\uff1a<code>sayHello\u00a0as\u00a0private\u00a0myPrivateHello;<\/code><\/li>\n<li>\u4e86\u5bf9\u4f7f\u7528\u7684\u7c7b\u65bd\u52a0\u5f3a\u5236\u8981\u6c42\uff0ctrait \u652f\u6301\u62bd\u8c61\u65b9\u6cd5\u7684\u4f7f\u7528<\/li>\n<li>Traits \u53ef\u4ee5\u88ab\u9759\u6001\u6210\u5458\u9759\u6001\u65b9\u6cd5\u5b9a\u4e49,\u5982\u679c trait \u5b9a\u4e49\u4e86\u4e00\u4e2a\u5c5e\u6027\uff0c\u90a3\u7c7b\u5c06\u4e0d\u80fd\u5b9a\u4e49\u540c\u6837\u540d\u79f0\u7684\u5c5e\u6027\uff0c\u5426\u5219\u4f1a\u4ea7\u751f\u4e00\u4e2a\u9519\u8bef\u3002<\/li>\n<\/ul>\n<p><strong>12\u3001\u533f\u540d\u7c7b \uff0d \u975e\u5e38\u6709\u7528<\/strong><\/p>\n<ul>\n<li>\u5b57\u9762\u542b\u4e49\uff0c\u5373\u6ca1\u6709\u7c7b\u540d\u79f0\u7684\u7c7b\uff0c\u4f7f\u7528 new class{} \u6216\u8005 new class(10) extends outClassName<\/li>\n<li>\u53c2\u8003\u6587\u6863\uff1ahttp:\/\/php.net\/manual\/zh\/language.oop5.anonymous.php<\/li>\n<\/ul>\n<p><strong>13\u3001overloading \u2013 \u91cd\u8f7d<\/strong><\/p>\n<ul>\n<li>PHP\u7684\u91cd\u8f7d\u4f7f\u7528\u9b54\u672f\u65b9\u6cd5\u6765\u5b9e\u73b0\uff0c\u9b54\u672f\u65b9\u6cd5\u5305\u62ec__set\u3001__get\u3001__unset\u3001__isset\u3001__call\u3001__callstatic\u3002<\/li>\n<li>\u5f53\u8bbf\u95ee\u4e0d\u53ef\u89c1\u7684\u3001\u672a\u5b9a\u4e49\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u91cd\u8f7d\u7684\u9b54\u672f\u65b9\u6cd5\u4f1a\u88ab\u8c03\u7528\u3002<\/li>\n<li class=\"p1\"><span class=\"s1\">\u6240\u6709\u7684\u91cd\u8f7d\u9b54\u672f\u65b9\u6cd5\u90fd\u5fc5\u987b\u88ab\u58f0\u660e\u4e3a\u00a0<i>public\uff0c<\/i><\/span>\u8fd9\u4e9b\u9b54\u672f\u65b9\u6cd5\u7684\u53c2\u6570\u90fd\u4e0d\u80fd<span class=\"s2\">\u901a\u8fc7\u5f15\u7528\u4f20\u9012<\/span><\/li>\n<\/ul>\n<p class=\"p1\"><strong>14\u3001\u9b54\u672f\u65b9\u6cd5<\/strong><\/p>\n<p class=\"p1\">__construct()\uff0c __destruct()\uff0c __call()\uff0c __callStatic()\uff0c __get()\uff0c __set()\uff0c __isset()\uff0c __unset()\uff0c __sleep()\uff0c __wakeup()\uff0c __toString()\uff0c __invoke()\uff0c __set_state()\uff0c __clone() \u548c __debugInfo()<\/p>\n<ul>\n<li class=\"p1\">__sleep()\u548c__wakeup()\uff0c\u5206\u522b\u5728\u4f7f\u7528serialize\u548cunserialize\u65f6\u8c03\u7528\u3002<\/li>\n<li class=\"p1\">__toString()\uff1a\u5f53\u7c7b\u88ab\u5f53\u6210\u5b57\u7b26\u4e32\u4f7f\u7528\u65f6\u8c03\u7528\uff0c\u4f8b\u5982\uff1aecho $obj<\/li>\n<li class=\"p1\">__invoke()\uff1a\u5f53\u5c1d\u8bd5\u4ee5\u8c03\u7528\u51fd\u6570\u7684\u65b9\u5f0f\u8c03\u7528\u4e00\u4e2a\u5bf9\u8c61\u65f6\u8c03\u7528\u3002\u5373\u628a\u5bf9\u8c61\u5f53\u6210\u51fd\u6570\u5904\u7406\uff0c<span class=\"s1\">$obj\u00a0<\/span><span class=\"s2\">=\u00a0new\u00a0<\/span><span class=\"s1\">CallableClass<\/span><span class=\"s2\">; \u00a0<\/span><span class=\"s1\">$obj<\/span><span class=\"s2\">(<\/span><span class=\"s1\">5<\/span><span class=\"s2\">);<\/span><\/li>\n<li class=\"p1\">__debugInfo()\uff1a\u5728\u6253\u5370\u8f93\u51fa\u65f6\u88ab\u8c03\u7528\uff0c\u4f8b\u5982var_dump();<\/li>\n<li class=\"p1\">__clone()\uff1a\u5bf9\u8c61\u590d\u5236\u65f6\u4f7f\u7528.<\/li>\n<\/ul>\n<p class=\"p1\"><strong>15\u3001\u540e\u671f\u9759\u6001\u7ed1\u5b9a<\/strong><\/p>\n<p>\u540e\u671f\u9759\u6001\u7ed1\u5b9a\u7684\u89e3\u6790\u4f1a\u4e00\u76f4\u5230\u53d6\u5f97\u4e00\u4e2a\u5b8c\u5168\u89e3\u6790\u4e86\u7684\u9759\u6001\u8c03\u7528\u4e3a\u6b62\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u5982\u679c\u9759\u6001\u8c03\u7528\u4f7f\u7528 parent:: \u6216\u8005 self:: \u5c06\u8f6c\u53d1\u8c03\u7528\u4fe1\u606f\u3002<\/p>\n<p><strong>16\u3001\u5173\u952e\u5b57final<\/strong><\/p>\n<ul>\n<li>final\u4ec5\u80fd\u5b9a\u4e49\u7c7b\u548c\u65b9\u6cd5\uff0c\u4e0d\u80fd\u5b9a\u4e49\u5c5e\u6027\u3002final\u5b9a\u4e49\u7684\u65b9\u6cd5\u4e0d\u80fd\u88ab\u5b50\u7c7b\u8986\u76d6\uff0cfinal\u5b9a\u4e49\u7684\u7c7b\u4e0d\u80fd\u88ab\u7ee7\u627f\u3002<\/li>\n<\/ul>\n<p><strong>17\u3001\u5bf9\u8c61\u7684\u6bd4\u8f83<\/strong><\/p>\n<ul>\n<li>==\u6210\u7acb\u7684\u6761\u4ef6\uff1aa\u548cb\u4e24\u4e2a\u5bf9\u8c61\u5177\u6709\u76f8\u540c\u7684\u5c5e\u6027\u548c\u5c5e\u6027\u503c\uff0c\u800c\u4e14\u4e24\u4e2a\u5bf9\u8c61\u662f\u540c\u4e00\u4e2a\u7c7b\u7684\u5b9e\u4f8b\u3002<\/li>\n<li>===\u6210\u7acb\u7684\u6761\u4ef6\uff1aa\u548cb\u4e24\u4e2a\u5bf9\u8c61\u53d8\u91cf\u4e00\u5b9a\u8981\u6307\u5411\u67d0\u4e2a\u7c7b\u7684\u540c\u4e00\u4e2a\u5b9e\u4f8b\uff08\u540c\u4e00\u4e2a\u5bf9\u8c61\uff09<\/li>\n<\/ul>\n<p><strong>18\u3001\u7c7b\u578b\u7ea6\u675f<\/strong><\/p>\n<ul>\n<li>\u7c7b\u578b\u53ef\u4ee5\u6307\u5b9a\u4e3a\u5bf9\u8c61\uff08\u5728\u51fd\u6570\u539f\u578b\u91cc\u9762\u6307\u5b9a\u7c7b\u7684\u540d\u5b57\uff09\u3001\u63a5\u53e3\u3001\u6570\u7ec4\u3001callable\uff0cNULL\u503c\uff0c\u4e0d\u80fd\u4f7f\u7528int\u3001string\u3002<\/li>\n<li>\u7c7b\u578b\u7684\u7ea6\u675f\u9664\u4e86\u4f7f\u7528\u5728\u7c7b\u7684\u65b9\u6cd5\u4e2d\uff0c\u540c\u6837\u53ef\u4ee5\u4f7f\u7528\u5728\u666e\u901a\u7684\u51fd\u6570\u4e2d\u3002<\/li>\n<\/ul>\n<p><strong>19\u3001\u5bf9\u8c61\u548c\u5f15\u7528<\/strong><\/p>\n<p><strong>20\u3001\u5bf9\u8c61\u7684\u5e8f\u5217\u5316(serialize)\u548c\u53cd\u5e8f\u5217\u5316(unserialize)<\/strong><\/p>\n<ul>\n<li class=\"p1\">\u5bf9\u8c61\u7684\u5e8f\u5217\u5316\u4ec5\u4fdd\u5b58\u7c7b\u5c5e\u6027\u3002<\/li>\n<li class=\"p1\">\u5bf9\u8c61\u53cd\u5e8f\u5217\u5316\u65f6\uff0c\u5fc5\u987b\u786e\u4fdd\u6709\u8be5\u5bf9\u8c61\u7684\u7c7b\u5b9a\u4e49\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001new\u7684\u51e0\u79cd\u65b9\u5f0f $obj = new ClassName(); $obj = new ClassName; $obj = new $obj; $className = &#8216;Foo&#8217;; $obj = new $className; &nbsp; 2\u3001new self\u3001new static\u3001new parent\u7684\u533a\u522b \u7b49\u5f85\u8865\u5145 3\u3001extends \u2013 \u7ee7\u627f PHP\u4e0d\u652f\u6301\u591a\u91cd\u7ee7\u627f\uff0c\u4e00\u4e2a\u7c7b\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u57fa\u7c7b\u3002 \u88ab\u7ee7\u627f\u7684\u65b9\u6cd5\u548c\u5c5e\u6027\u53ef\u4ee5\u901a\u8fc7\u7528\u540c\u6837\u7684\u540d\u5b57\u91cd\u65b0\u58f0\u660e\u88ab\u8986\u76d6\u3002\u4f46\u662f\u5982\u679c\u7236\u7c7b\u5b9a\u4e49\u65b9\u6cd5\u65f6\u4f7f\u7528\u4e86 final\uff0c\u5219\u8be5\u65b9\u6cd5\u4e0d\u53ef\u88ab\u8986\u76d6\u3002\u53ef\u4ee5\u901a\u8fc7 parent:: \u6765\u8bbf\u95ee\u88ab\u8986\u76d6\u7684\u65b9\u6cd5\u6216\u5c5e\u6027\u3002 \u5f53\u8986\u76d6\u65b9\u6cd5\u65f6\uff0c\u53c2\u6570\u5fc5\u987b\u4fdd\u6301\u4e00\u81f4\u5426\u5219 PHP \u5c06\u53d1\u51fa E_STRICT \u7ea7\u522b\u7684\u9519\u8bef\u4fe1\u606f\u3002\u4f46\u6784\u9020\u51fd\u6570\u4f8b\u5916\uff0c\u6784\u9020\u51fd\u6570\u53ef\u5728\u88ab\u8986\u76d6\u65f6\u4f7f\u7528\u4e0d\u540c\u7684\u53c2\u6570\u3002 4\u3001::class \u81ea PHP 5.5 \u8d77\uff0c\u5173\u952e\u8bcd class \u4e5f\u53ef\u7528\u4e8e\u7c7b\u540d\u7684\u89e3\u6790\u3002\u4f7f\u7528 ClassName::class \u4f60\u53ef\u4ee5\u83b7\u53d6\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5305\u542b\u4e86\u7c7b ClassName \u7684\u5b8c\u5168\u9650\u5b9a\u540d\u79f0\u3002\u8fd9\u5bf9\u4f7f\u7528\u4e86 \u547d\u540d\u7a7a\u95f4 \u7684\u7c7b\u5c24\u5176\u6709\u7528\u3002 5\u3001\u5c5e\u6027\u3001\u65b9\u6cd5\u3001\u5bf9\u8c61\u7684\u8bbf\u95ee\u63a7\u5236\u53ca\u53ef\u89c1\u6027 \u5c5e\u6027\u521d\u59cb\u5316\u7684\u503c\u5fc5\u987b\u662f\u5e38\u6570\uff0c\u8fd9\u91cc\u7684\u5e38\u6570\u662f\u6307 PHP [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-27421","post","type-post","status-publish","format-standard","hentry","category-docker"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/27421","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=27421"}],"version-history":[{"count":1,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/27421\/revisions"}],"predecessor-version":[{"id":27428,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/27421\/revisions\/27428"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=27421"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=27421"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=27421"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}