{"id":30179,"date":"2023-09-25T06:43:09","date_gmt":"2022-12-13T20:22:11","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90php-next%e3%80%91%e6%88%91%e5%b8%8c%e6%9c%9bphp%e6%9c%89%e4%b8%80%e4%b8%aaclamp%e5%87%bd%e6%95%b0%e3%80%82\/"},"modified":"2025-08-12T17:57:05","modified_gmt":"2025-08-12T09:57:05","slug":"%e3%80%90php-next%e3%80%91%e6%88%91%e5%b8%8c%e6%9c%9bphp%e6%9c%89%e4%b8%80%e4%b8%aaclamp%e5%87%bd%e6%95%b0%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90php-next%e3%80%91%e6%88%91%e5%b8%8c%e6%9c%9bphp%e6%9c%89%e4%b8%80%e4%b8%aaclamp%e5%87%bd%e6%95%b0%e3%80%82\/","title":{"rendered":"\u3010PHP Next\u3011\u6211\u5e0c\u671bPHP\u6709\u4e00\u4e2aclamp\u51fd\u6570"},"content":{"rendered":"

\u6211\u4e0e\u300a\u9b54\u5361\u5c11\u5973\u6a31\u300b\u6ca1\u6709\u4efb\u4f55\u5173\u7cfb\u3002<\/p>\n

clamp\u662f\u6307\u5c06\u53c2\u6570\u7684\u6570\u503c\u9650\u5236\u5728\u4e00\u4e2a\u8303\u56f4\u5185\uff0cCSS\u5df2\u7ecf\u5b9e\u73b0\u4e86clamp\uff0c\u56e0\u6b64\u5728CSS\u4e2d\u53ef\u4ee5\u5f88\u5bb9\u6613\u5730\u770b\u5230\u5b83\u7684\u7528\u6cd5\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8eclamp(min=100, max=200)\uff0c\u5982\u679c\u4f20\u5165150\uff0c\u5219\u8fd4\u56de150\uff1b\u5982\u679c\u4f20\u51650\uff0c\u5219\u8fd4\u56de100\uff1b\u5982\u679c\u4f20\u5165300\uff0c\u5219\u8fd4\u56de200\u3002<\/p>\n

\u56e0\u6b64\uff0c\u63d0\u51fa\u4e86\u4e00\u9879RFC\uff0c\u5e0c\u671b\u5728PHP\u4e2d\u6dfb\u52a0clamp\u529f\u80fd\u3002
\n\u4ee5\u4e0b\u662f\u76f8\u5173\u7684RFC\uff0cPHP RFC\uff1a\u4ecb\u7ecdclamp\u529f\u80fd\u3002<\/p>\n

PHP RFC\uff1aclamp<\/p>\n

\u5f15\u8a00clamp\u51fd\u6570\u7528\u4e8e\u68c0\u67e5\u503c\u662f\u5426\u5728\u7ed9\u5b9a\u7684\u8303\u56f4\u5185\u3002
\n\u5982\u679c\u503c\u5728\u8303\u56f4\u5185\uff0c\u5219\u8fd4\u56de\u8be5\u503c\uff1b\u5982\u679c\u503c\u8d85\u51fa\u8303\u56f4\uff0c\u5219\u8fd4\u56de\u8fb9\u754c\u503c\u3002<\/p>\n

\u7528\u6237\u7a7a\u95f4\u7684\u5b9e\u73b0\u6709\u591a\u79cd\uff0c\u5305\u62ec\u4f7f\u7528min\u548cmax\u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u4f46\u7531\u4e8e\u5176\u8ba1\u7b97\u6210\u672c\u8f83\u9ad8\uff0c\u9891\u7e41\u8c03\u7528\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002
\n\u7531\u4e8e\u8bb8\u591a\u7528\u6237\u7a7a\u95f4\u5b9e\u73b0\u4e0d\u8003\u8651\u8c03\u7528\u6210\u672c\uff0c\u56e0\u6b64\u5e0c\u671b\u5728\u8bed\u8a00\u5c42\u9762\u5b9e\u73b0\u5b83\u4eec\u3002<\/p>\n

\u63d0\u6848\u5728\u6b64RFC\u4e2d\uff0c\u63d0\u8bae\u5f15\u5165\u4e00\u79cd\u65b0\u7684\u51fd\u6570clamp\u3002<\/p>\n
clamp<\/span> (<\/span> int<\/span>|<\/span>float<\/span> $num<\/span>,<\/span> int<\/span>|<\/span>float<\/span> $min<\/span>,<\/span> int<\/span>|<\/span>float<\/span> $max<\/span> )<\/span> :<\/span> int<\/span>|<\/span>float<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u4e2a\u51fd\u6570\u6709\u4e09\u4e2a\u53c2\u6570\uff1a$num\u3001$min\u3001$max\u3002
\n\u5b83\u4f1a\u68c0\u67e5$num\u662f\u5426\u5728$min\u548c$max\u4e4b\u95f4\uff0c\u5982\u679c\u5728\u8303\u56f4\u5185\uff0c\u5219\u8fd4\u56de$num\u3002
\n\u5982\u679c\u4e0d\u5728\u8303\u56f4\u5185\uff0c\u5219\u8fd4\u56de$min\u548c$max\u4e2d\u8f83\u63a5\u8fd1\u7684\u90a3\u4e2a\u3002
\n\u6362\u53e5\u8bdd\u8bf4\uff0c\u5982\u679c$num > $max\uff0c\u5219\u8fd4\u56de$max\uff1b\u5982\u679c$num < $min\uff0c\u5219\u8fd4\u56de$min\u3002<\/p>\n
\u5982\u679c$max$\u5c0f\u4e8e$min$\uff0c\u5219\u629b\u51faValueError\u4f5c\u4e3a\u65e0\u6548\u503c\u3002
\n\u5f53\u5176\u4e2d\u4e00\u4e2a\u503c\u4e3aNAN\u65f6\uff0c\u4e5f\u4f1a\u5f15\u53d1ValueError\u3002<\/p>\n
\u4f5c\u4e3a\u4f8b\u5b50\uff0c\u53ef\u4ee5\u91c7\u7528\u4ee5\u4e0b\u65b9\u5f0f\u3002<\/p>\n
clamp<\/span>(<\/span>num<\/span>:<\/span> 1<\/span>,<\/span> min<\/span>:<\/span> 0<\/span>,<\/span> max<\/span>:<\/span> 3<\/span>);<\/span> \/\/ 1 \u7bc4\u56f2\u5185<\/span>\r\nclamp<\/span>(<\/span>num<\/span>:<\/span> 1<\/span>,<\/span> min<\/span>:<\/span> 2<\/span>,<\/span> max<\/span>:<\/span> 5<\/span>);<\/span> \/\/ 2 \u5c0f\u3055\u3044<\/span>\r\nclamp<\/span>(<\/span>num<\/span>:<\/span> 4<\/span>,<\/span> min<\/span>:<\/span> 1<\/span>,<\/span> max<\/span>:<\/span> 3<\/span>);<\/span> \/\/ 3 \u5927\u304d\u3044<\/span>\r\n\r\nclamp<\/span>(<\/span>num<\/span>:<\/span> 0<\/span>,<\/span> min<\/span>:<\/span> 2<\/span>,<\/span> max<\/span>:<\/span> 1<\/span>);<\/span> \/\/ clamp(): Argument #2 ($min) cannot be greater than Argument #3 ($max)<\/span>\r\n<\/code><\/pre>\n
\u4e0d\u5411\u540e\u517c\u5bb9\u7684\u66f4\u6539 (B\u00f9 de\u5728PHP\u4e2d\u6ca1\u6709\u81ea\u8eab\u7684\u4e0d\u517c\u5bb9\u66f4\u6539\u3002
\n“clamp()”\u51fd\u6570\u540d\u5c06\u4e0d\u80fd\u518d\u4f7f\u7528\u3002<\/p>\n
PHP\u7248\u672c\u7684\u63d0\u8baePHP8.x<\/p>\n
PHP8.x \u7684\u7248\u672c<\/p>\n
\u672a\u89e3\u51b3\u7684\u95ee\u9898\u6709\u5173NAN\u7684\u5904\u7406\u65b9\u6cd5\u3002<\/p>\n
\u5b9e\u65bd\u62c9\u53d6\u8bf7\u6c42<\/p>\n
\u53c2\u8003\u6587\u732e\u7c7b\u4f3c\u7684\u5b9e\u73b0\u3002
\nC++
\nCRAN
\nCSS<\/p>\n
\u6211\u5bf9\u6b64\u6709\u5f88\u591a\u60f3\u6cd5\u3002
\n\u636e\u8bf4clamp\u662f\u5728IEEE754-2019\u6807\u51c6\u4e2d\u786e\u5b9a\u7684\u3002\u867d\u7136\u770b\u4e0d\u5230\uff0c\u4f46\u770b\u6765\u8fd9\u6837\u7684\u4e1c\u897f\u4e5f\u88ab\u5b9a\u4e49\u4e86\u3002<\/p>\n
\u8fd9\u4e2a\u51fd\u6570\u5728PHP\u4e2d\u4e5f\u53ef\u4ee5\u5f88\u5bb9\u6613\u5730\u5b9e\u73b0\u3002<\/p>\n
function<\/span> clamp<\/span>(<\/span>int<\/span>|<\/span>float<\/span> $num<\/span>,<\/span> int<\/span>|<\/span>float<\/span> $min<\/span>,<\/span> int<\/span>|<\/span>float<\/span> $max<\/span>):<\/span>int<\/span>|<\/span>float<\/span> {<\/span>\r\n    if<\/span>(<\/span>$max<\/span> <<\/span> $min<\/span>){<\/span>\r\n        throw<\/span> new<\/span> \\ValueError<\/span>(<\/span>'clamp(): Argument #2 ($min) cannot be greater than Argument #3 ($max)'<\/span>);<\/span>\r\n    }<\/span>\r\n    if<\/span>(<\/span>$max<\/span> <<\/span> $num<\/span>){<\/span>\r\n        return<\/span> $max<\/span>;<\/span>\r\n    }<\/span>\r\n    if<\/span>(<\/span>$min<\/span> ><\/span> $num<\/span>){<\/span>\r\n        return<\/span> $min<\/span>;<\/span>\r\n    }<\/span>\r\n    return<\/span> $num<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5728Pull Request\u4e2d\uff0c\u7528C\u8bed\u8a00\u8fdb\u884c\u7684\u5b9e\u73b0\u51e0\u4e4e\u76f8\u540c\u3002<\/p>\n
\tif<\/span> (<\/span>zend_compare<\/span>(<\/span>zmin<\/span>,<\/span> zmax<\/span>)<\/span> ><\/span> 0<\/span>)<\/span> {<\/span>\r\n\t\tzend_argument_value_error<\/span>(<\/span>2<\/span>,<\/span> \"must be smaller than or equal to argument #3 ($max)\"<\/span>);<\/span>\r\n\t\tRETURN_THROWS<\/span>();<\/span>\r\n\t}<\/span>\r\n\tif<\/span> (<\/span>zend_compare<\/span>(<\/span>zmax<\/span>,<\/span> zvalue<\/span>)<\/span> ==<\/span> -<\/span>1<\/span>)<\/span> {<\/span>\r\n\t\tRETURN_COPY_VALUE<\/span>(<\/span>zmax<\/span>);<\/span>\r\n\t}<\/span> else<\/span> if<\/span> (<\/span>zend_compare<\/span>(<\/span>zvalue<\/span>,<\/span> zmin<\/span>)<\/span> ==<\/span> -<\/span>1<\/span>)<\/span> {<\/span>\r\n\t\tRETURN_COPY_VALUE<\/span>(<\/span>zmin<\/span>);<\/span>\r\n\t}<\/span> else<\/span> {<\/span>\r\n\t\tRETURN_COPY_VALUE<\/span>(<\/span>zvalue<\/span>);<\/span>\r\n\t}<\/span>\r\n<\/code><\/pre>\n
\u56e0\u6b64\uff0c\u5e76\u4e0d\u662f\u7edd\u5bf9\u5fc5\u8981\u7684\u51fd\u6570\uff0c\u5c31\u50cfstr_contains\u4e00\u6837\uff0c\u6ca1\u6709\u5b83\u4e5f\u80fd\u5e94\u4ed8\uff0c\u4f46\u5982\u679c\u6709\u7684\u8bdd\uff0c\u5b83\u662f\u4e00\u4e2a\u65b9\u4fbf\u7684\u8f85\u52a9\u51fd\u6570\u3002<\/p>\n
\u8fd9\u4efdRFC\u4e8e2021\u5e746\u6708\u63d0\u4ea4\uff0c\u5e76\u5728\u63a5\u4e0b\u6765\u7684\u4e00\u4e2a\u6708\u5de6\u53f3\u5b8c\u6210\u4e86\u4ee3\u7801\u7684\u5b9e\u65bd\u3002
\n\u7136\u800c\uff0c\u4e4b\u540e\u5c31\u5b8c\u5168\u5931\u53bb\u6d88\u606f\uff0c\u8fdb\u5c55\u505c\u6ede\u4e0d\u524d\u3002
\n\u7531\u4e8e\u4f5c\u8005\u5728\u5176\u4ed6\u9879\u76ee\u4e0a\u6709\u5404\u79cd\u5404\u6837\u7684\u63d0\u4ea4\uff0c\u53ef\u80fd\u662f\u56e0\u4e3a\u4ed6\u611f\u5230\u538c\u5026\u6216\u89c9\u5f97\u9ebb\u70e6\u5427\u3002<\/p>\n
\u7136\u800c\u540e\u6765\uff0c\u7531\u4e8e\u4e00\u4e9b\u8bc4\u8bba\u8bf4\u201c\u6211\u60f3\u8981\u8fd9\u4e2a\u201d\uff0c\u8fd9\u4e9b\u8bc4\u8bba\u6216\u8bb8\u4f1a\u88ab\u9010\u6e10\u52a0\u5165\u5230Pull Request\u4e2d\uff0c\u672a\u6765\u6216\u8bb8\u4f1a\u88ab\u91c7\u7eb3\uff0c\u4e5f\u6709\u53ef\u80fd\u4e0d\u4f1a\u3002<\/p>\n
\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u4ee5\u4e0b\u53ef\u80fd\u662f\u6700\u7b80\u5355\u7684\u5b9e\u73b0\u65b9\u6cd5\uff0c\u4f46\u540c\u65f6\u4e5f\u662fRFC\u6240\u8c13\u7684\u6162\u901f\u5b9e\u73b0\u3002<\/p>\n
function<\/span> clamp<\/span>(<\/span>int<\/span>|<\/span>float<\/span> $num<\/span>,<\/span> int<\/span>|<\/span>float<\/span> $min<\/span>,<\/span> int<\/span>|<\/span>float<\/span> $max<\/span>):<\/span>int<\/span>|<\/span>float<\/span> {<\/span>\r\n    return<\/span> max<\/span>(<\/span>$min<\/span>,<\/span> min<\/span>(<\/span>$max<\/span>,<\/span> $num<\/span>));<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6211\u4e0d\u77e5\u9053\u4ed6\u662f\u5426\u5df2\u7ecf\u5750\u5728\u677f\u51f3\u4e0a\uff0c\u4f46\u4ed6\u770b\u8d77\u6765\u663e\u7136\u5f88\u6162\u3002\u4e0d\u8fc7\uff0c\u4f7f\u7528\u5982\u6b64\u5927\u91cf\u7684clamp\u8c03\u7528\u5728\u8fd9\u4e2a\u7a0b\u5ea6\u4e0a\u4ea7\u751f\u663e\u8457\u5dee\u5f02\uff0c\u7a76\u7adf\u662f\u51fa\u4e8e\u4ec0\u4e48\u6837\u7684\u7528\u4f8b\u5462\uff1f<\/p>\n","protected":false},"excerpt":{"rendered":"
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