![\"php\u7684switch\u600e\u4e48\u7528\"](\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/24131724\/9167709b-4777-4cb5-98bd-36e122cb154b.webp\")
<\/p>\n<\/p>\n
PHP\u4e2d\u7684 \u5176\u4e2d\u4e00\u4e2a\u6700\u4e3a\u660e\u663e\u7684\u4f18\u52bf\u5728\u4e8e\u63d0\u9ad8\u7a0b\u5e8f\u7684\u53ef\u8bfb\u6027\u3002\u5f53\u4f60\u6709\u4e00\u4e2a\u53d8\u91cf\u9700\u8981\u4e0e\u8bb8\u591a\u503c\u6bd4\u8f83\u65f6\uff0c\u4f7f\u7528\u591a\u4e2a case value1:<\/p>\n \/\/ Code to be executed if expression = value1<\/p>\n break;<\/p>\n case value2:<\/p>\n \/\/ Code to be executed if expression = value2<\/p>\n break;<\/p>\n ...<\/p>\n default:<\/p>\n \/\/ Code to be executed if expression is different from all 'case' labels<\/p>\n }<\/p>\n <\/code><\/pre>\n<\/p>\n \u5728\u6bcf\u4e2a case 0:<\/p>\n echo "It is 0.";<\/p>\n \/\/ No break here, so the next case will be executed as well<\/p>\n case 1:<\/p>\n echo "It is 1.";<\/p>\n break;<\/p>\n default:<\/p>\n echo "It is neither 0 nor 1.";<\/p>\n }<\/p>\n <\/code><\/pre>\n<\/p>\n \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5982\u679c case 0:<\/p>\n echo "It is 0.";<\/p>\n break;<\/p>\n case 1:<\/p>\n echo "It is 1.";<\/p>\n break;<\/p>\n default:<\/p>\n echo "Unknown value.";<\/p>\n break;<\/p>\n }<\/p>\n <\/code><\/pre>\n<\/p>\n \u5728\u6b64\uff0c\u5982\u679c \u6709\u65f6\u5019\uff0c\u591a\u4e2a case 0:<\/p>\n case 1:<\/p>\n case 2:<\/p>\n echo "It is less than 3.";<\/p>\n break;<\/p>\n default:<\/p>\n echo "It is 3 or more.";<\/p>\n break;<\/p>\n }<\/p>\n <\/code><\/pre>\n<\/p>\n \u867d\u7136 case 0:<\/p>\n echo "The sum is 0.";<\/p>\n break;<\/p>\n case 5:<\/p>\n echo "The sum is 5.";<\/p>\n break;<\/p>\n default:<\/p>\n echo "The sum is neither 0 nor 5.";<\/p>\n break;<\/p>\n }<\/p>\n <\/code><\/pre>\n<\/p>\n \u8fd9\u91cc\uff0c Q: PHP\u4e2dswitch\u8bed\u53e5\u662f\u5982\u4f55\u4f7f\u7528\u7684\uff1f<\/strong><\/p>\n A: \u5728PHP\u4e2d\uff0cswitch\u8bed\u53e5\u7528\u4e8e\u6267\u884c\u591a\u4e2a\u6761\u4ef6\u7684\u9009\u62e9\u3002\u5b83\u57fa\u4e8e\u4e00\u4e2a\u8868\u8fbe\u5f0f\u7684\u503c\uff0c\u5728\u4e00\u7cfb\u5217\u7684case\u4e2d\u9009\u62e9\u5339\u914d\u7684\u9009\u9879\u6765\u6267\u884c\u4ee3\u7801\u3002\u53ef\u4ee5\u4f7f\u7528break\u8bed\u53e5\u6765\u7ed3\u675f\u6bcf\u4e2acase\uff0c\u5e76\u907f\u514d\u6267\u884c\u5176\u4ed6case\u3002\u5982\u679c\u6ca1\u6709\u5339\u914d\u7684case\uff0c\u53ef\u4ee5\u4f7f\u7528default\u6765\u6267\u884c\u5907\u7528\u4ee3\u7801\u5757\u3002<\/p>\n Q: PHP\u4e2dswitch\u8bed\u53e5\u7684\u4f18\u70b9\u548c\u7528\u9014\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n A: switch\u8bed\u53e5\u5728\u9700\u8981\u57fa\u4e8e\u4e0d\u540c\u7684\u6761\u4ef6\u6267\u884c\u4e0d\u540c\u4ee3\u7801\u5757\u65f6\u975e\u5e38\u6709\u7528\u3002\u5b83\u53ef\u4ee5\u8ba9\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u548c\u6613\u8bfb\uff0c\u5e76\u4e14\u53ef\u4ee5\u6bd4\u4f7f\u7528\u591a\u4e2aif\u8bed\u53e5\u66f4\u9ad8\u6548\u3002\u5728\u9700\u8981\u5904\u7406\u591a\u4e2a\u9009\u62e9\u800c\u4e0d\u662f\u4ec5\u4ec5\u5bf9\u4e00\u4e2a\u6761\u4ef6\u8fdb\u884c\u5224\u65ad\u65f6\uff0cswitch\u8bed\u53e5\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u9009\u62e9\u3002<\/p>\n Q: switch\u8bed\u53e5\u9002\u7528\u4e8e\u54ea\u4e9b\u573a\u666f\uff1f\u6709\u6ca1\u6709\u4ec0\u4e48\u9700\u8981\u6ce8\u610f\u7684\u5730\u65b9\uff1f<\/strong><\/p>\n A: switch\u8bed\u53e5\u9002\u7528\u4e8e\u9700\u8981\u6839\u636e\u4e0d\u540c\u7684\u6761\u4ef6\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u5757\u7684\u573a\u666f\u3002\u4f8b\u5982\uff0c\u5f53\u6839\u636e\u7528\u6237\u9009\u62e9\u7684\u9009\u9879\u6765\u8fdb\u884c\u4e0d\u540c\u7684\u64cd\u4f5c\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528switch\u8bed\u53e5\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6bcf\u4e2acase\u540e\u9762\u7684\u4ee3\u7801\u5757\u5e94\u8be5\u4ee5break\u8bed\u53e5\u7ed3\u675f\uff0c\u4ee5\u9632\u6b62\u6267\u884c\u5176\u4ed6case\u3002\u5982\u679c\u6ca1\u6709\u5339\u914d\u7684case\uff0c\u53ef\u4ee5\u5728\u6700\u540e\u4f7f\u7528default\u6765\u6267\u884c\u5907\u7528\u4ee3\u7801\u5757\u3002\u6b64\u5916\uff0c\u8bb0\u4f4f\u5728\u4f7f\u7528switch\u8bed\u53e5\u65f6\u4fdd\u6301\u4ee3\u7801\u7684\u6e05\u6670\u548c\u7b80\u6d01\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"PHP\u4e2d\u7684switch\u8bed\u53e5\u7528\u4e8e\u7b80\u5316\u591a\u4e2aif\u5224\u65ad\u6761\u4ef6\u7684\u573a\u666f\uff0c\u901a\u8fc7\u4e00\u4e2a\u8868\u8fbe\u5f0f\u7684\u503c\u8df3\u8f6c\u5230\u5bf9\u5e94\u7684case\u6267\u884c\u76f8\u5e94\u4ee3\u7801\u5757 […]","protected":false},"author":3,"featured_media":133565,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/133559"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=133559"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/133559\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/133565"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=133559"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=133559"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=133559"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}switch<\/code>\u8bed\u53e5\u7528\u4e8e\u7b80\u5316\u591a\u4e2aif<\/code>\u5224\u65ad\u6761\u4ef6\u7684\u573a\u666f\uff0c\u901a\u8fc7\u4e00\u4e2a\u8868\u8fbe\u5f0f\u7684\u503c\u8df3\u8f6c\u5230\u5bf9\u5e94\u7684case<\/code>\u6267\u884c\u76f8\u5e94\u4ee3\u7801\u5757\u3002\u4f7f\u7528switch<\/code>\u8bed\u53e5\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3001\u63d0\u4f9b\u6e05\u6670\u7684\u6761\u4ef6\u5206\u652f\u9009\u62e9\u3001\u7b80\u5316\u590d\u6742\u7684if-else<\/code>\u94fe<\/strong>\u3002<\/p>\n<\/p>\nif-else<\/code>\u8bed\u53e5\u4e0d\u4ec5\u4ee3\u7801\u5197\u957f\uff0c\u4e5f\u96be\u4ee5\u8ffd\u8e2a\u3002switch<\/code>\u901a\u8fc7\u5b9a\u4e49\u4e0d\u540c\u7684case<\/code>\u6765\u5904\u7406\u5404\u4e2a\u7279\u5b9a\u503c\uff0c\u53ef\u4ee5\u8ba9\u4eba\u4e00\u76ee\u4e86\u7136\u5730\u7406\u89e3\u8fd9\u6bb5\u903b\u8f91\u6240\u6db5\u76d6\u7684\u6240\u6709\u53ef\u80fd\u6027\u3002<\/p>\n<\/p>\n\u4e00\u3001SWITCH\u7684\u57fa\u672c\u8bed\u6cd5<\/h3>\n<\/p>\n
switch (expression) {<\/p>\nexpression<\/code> \u662f\u4e0e\u6bcf\u4e2acase<\/code>\u540e\u7684\u503c\u6bd4\u8f83\u7684\u8868\u8fbe\u5f0f\u3002\u6bcf\u4e2acase<\/code>\u5b9a\u4e49\u4e86\u4e00\u4e2a\u573a\u666f\uff0c\u5982\u679cexpression<\/code>\u7684\u503c\u4e0ecase<\/code>\u7684\u503c\u5339\u914d\uff0c\u5c31\u6267\u884c\u8be5case<\/code>\u4e0b\u7684\u4ee3\u7801\u3002break<\/code>\u5173\u952e\u5b57\u662f\u7528\u6765\u7ed3\u675fswitch<\/code>\u4ee3\u7801\u5757\uff0c\u9632\u6b62\u4ee3\u7801\u7ee7\u7eed\u6267\u884c\u5230\u4e0b\u4e00\u4e2acase<\/code>\u3002\u5982\u679c\u6ca1\u6709\u4efb\u4f55case<\/code>\u7684\u503c\u4e0eexpression<\/code>\u5339\u914d\uff0c\u5c06\u6267\u884cdefault<\/code>\u540e\u7684\u4ee3\u7801\u3002<\/p>\n<\/p>\n\u4e8c\u3001SWITCH\u4e0eBREAK<\/h3>\n<\/p>\n
case<\/code>\u4ee3\u7801\u5757\u7684\u672b\u5c3e\u4e0d\u52a0break<\/code>\u5c06\u53ef\u80fd\u5bfc\u81f4\u201ccase\u7a7f\u900f\u201d\uff0c\u5373\u4f7f\u5df2\u5339\u914d\u4e00\u79cd\u60c5\u51b5\uff0c\u4ee3\u7801\u4e5f\u4f1a\u7ee7\u7eed\u6267\u884c\u4e0b\u53bb\u3002<\/p>\n<\/p>\nswitch ($variable) {<\/p>\n$variable<\/code>\u7b49\u4e8e0\uff0c\u5b83\u5c06\u8f93\u51fa\u201cIt is 0.\u201d\u548c\u201cIt is 1.\u201d\u3002\u8981\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u6211\u4eec\u5fc5\u987b\u5728\u6bcf\u4e2acase<\/code>\u6267\u884c\u5b8c\u6bd5\u540e\u4f7f\u7528break<\/code>\u7ed3\u675f\u3002<\/p>\n<\/p>\n\u4e09\u3001SWITCH\u4e0eDEFAULT<\/h3>\n<\/p>\n
default<\/code>\u5173\u952e\u5b57\u5b9a\u4e49\u4e86\u5f53\u4efb\u4f55case<\/code>\u4e0d\u5339\u914d\u65f6\u5c06\u6267\u884c\u7684\u4ee3\u7801\u5757\u3002\u5728switch<\/code>\u4e2d\u4f7f\u7528default<\/code>\u6848\u4f8b\u53ef\u4ee5\u786e\u4fdd\u603b\u6709\u4e00\u5757\u4ee3\u7801\u4f1a\u88ab\u6267\u884c\uff0c\u589e\u5f3a\u4ee3\u7801\u7684\u5065\u58ee\u6027<\/strong>\u3002<\/p>\n<\/p>\nswitch ($variable) {<\/p>\n$variable<\/code>\u4e0d\u662f0\u4e5f\u4e0d\u662f1\uff0c\u5c06\u8f93\u51fa\u201cUnknown value.\u201d\u3002<\/p>\n<\/p>\n\u56db\u3001SWITCH\u7684\u591aCASE\u6bb5<\/h3>\n<\/p>\n
case<\/code>\u53ef\u80fd\u6267\u884c\u76f8\u540c\u7684\u4ee3\u7801\u5757\uff0cswitch<\/code>\u5141\u8bb8\u5c06\u5b83\u4eec\u5408\u5e76\u5728\u4e00\u8d77\uff0c\u7b80\u5316\u4ee3\u7801\u3002<\/p>\n<\/p>\nswitch ($variable) {<\/p>\n\u4e94\u3001SWITCH\u4e0e\u590d\u6742\u6761\u4ef6<\/h3>\n<\/p>\n
switch<\/code>\u4e3b\u8981\u7528\u4e8e\u5904\u7406\u5355\u4e2a\u53d8\u91cf\u4e0e\u591a\u4e2a\u503c\u7684\u6bd4\u8f83\uff0c\u4f46\u5b83\u4e5f\u53ef\u4ee5\u4e0e\u590d\u6742\u8868\u8fbe\u5f0f\u4e00\u8d77\u4f7f\u7528\u3002\u5f53\u4f60\u9700\u8981\u6839\u636e\u67d0\u4e9b\u8ba1\u7b97\u7ed3\u679c\u9009\u62e9\u6267\u884c\u4e0d\u540c\u4ee3\u7801\u65f6\uff0c\u53ef\u4ee5\u5c06\u8868\u8fbe\u5f0f\u653e\u5728switch<\/code>\u4e2d\u3002<\/p>\n<\/p>\nswitch ($a + $b) {<\/p>\n$a + $b<\/code>\u7684\u7ed3\u679c\u5c06\u88ab\u7528\u6765\u8fdb\u884ccase<\/code>\u503c\u5339\u914d\u3002<\/p>\n<\/p>\n\u516d\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
switch<\/code>\u8bed\u53e5\u662fPHP\u4e2d\u8fdb\u884c\u6761\u4ef6\u5904\u7406\u7684\u9ad8\u6548\u5de5\u5177\uff0c\u7279\u522b\u9002\u5408\u6709\u591a\u4e2a\u56fa\u5b9a\u9009\u9879\u9700\u8981\u8003\u8651\u7684\u573a\u5408\u3002\u901a\u8fc7\u4f7f\u7528switch<\/code>\u8bed\u53e5\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u5199\u51fa\u66f4\u7b80\u6d01\u3001\u53ef\u8bfb\u6027\u66f4\u597d\u7684\u4ee3\u7801<\/strong>\u3002\u7136\u800c\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u6709\u5927\u91cf\u6761\u4ef6\u6216\u975e\u5e38\u590d\u6742\u7684\u6761\u4ef6\u7684\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528switch<\/code>\u53ef\u80fd\u4e0d\u662f\u6700\u4f73\u9009\u62e9\uff0c\u6b64\u65f6\u53ef\u4ee5\u8003\u8651\u5176\u4ed6\u7684\u903b\u8f91\u63a7\u5236\u7ed3\u6784\uff0c\u5982if-else<\/code>\u6216try-catch<\/code>\u3002\u5728\u5b9e\u73b0\u903b\u8f91\u51b3\u7b56\u65f6\uff0c\u9009\u62e9\u6070\u5f53\u7684\u7ed3\u6784\u5bf9\u63d0\u5347\u4ee3\u7801\u8d28\u91cf\u548c\u7ef4\u62a4\u6027\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<\/p>\n\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n