{"id":34456,"date":"2023-06-15T16:03:14","date_gmt":"2023-06-15T08:03:14","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=34456"},"modified":"2023-07-31T02:10:57","modified_gmt":"2023-07-30T18:10:57","slug":"php%e8%bd%ac%e6%8d%a2%e5%a4%a7%e5%b0%8f%e5%86%99%e7%9a%84%e5%87%bd%e6%95%b0%e6%9c%89%e5%93%aa%e4%ba%9b","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/34456.html","title":{"rendered":"php\u8f6c\u6362\u5927\u5c0f\u5199\u7684\u51fd\u6570\u6709\u54ea\u4e9b"},"content":{"rendered":"
\n

php\u8f6c\u6362\u5927\u5c0f\u5199\u7684\u51fd\u6570\u6709\uff1a\u4e00\u3001strtolower()\u51fd\u6570\uff1b\u4e8c\u3001strtoupper()\u51fd\u6570\uff1b\u4e09\u3001ucfirst()\u51fd\u6570\uff1b\u56db\u3001ucwords()\u51fd\u6570\uff1b\u4e94\u3001lcfirst()\u51fd\u6570\uff1b\u516d\u3001mb_strtolower()\u51fd\u6570\uff1b\u4e03\u3001mb_strtoupper()\u51fd\u6570\uff1b\u516b\u3001mb_convert_case()\u51fd\u6570\u3002strtolower()\u51fd\u6570\u7528\u4e8e\u5c06\u6574\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5c0f\u5199\u3002<\/p>\n<\/blockquote>\n

\n
\"php\u8f6c\u6362\u5927\u5c0f\u5199\u7684\u51fd\u6570\u6709\u54ea\u4e9b\"<\/figure>\n<\/div>\n

\u4e00\u3001strtolower()\u51fd\u6570<\/h2>\n

strtolower()\u51fd\u6570\u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5c0f\u5199\u3002\u5b83\u63a5\u53d7\u4e00\u4e2a\u5b57\u7b26\u4e32\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\uff0c\u5176\u4e2d\u6240\u6709\u7684\u5b57\u6bcd\u5b57\u7b26\u90fd\u88ab\u8f6c\u6362\u4e3a\u5c0f\u5199\u5f62\u5f0f\u3002\u975e\u5b57\u6bcd\u5b57\u7b26\u5c06\u4fdd\u6301\u4e0d\u53d8\u3002<\/p>\n

\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u5c06\u628a\u5b57\u7b26\u4e32\u201dHello World!\u201d\u8f6c\u6362\u4e3a\u201dhello world!\u201d\uff1a<\/p>\n

$str = \"Hello World!\";\n$lowercase = strtolower($str);\necho $lowercase; \/\/ \u8f93\u51fa\uff1ahello world!<\/code><\/pre>\n
\u8fd9\u4e2a\u51fd\u6570\u975e\u5e38\u7b80\u5355\uff0c\u9002\u7528\u4e8e\u5c06\u6574\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5c0f\u5199\u7684\u60c5\u51b5\u3002<\/p>\n
\u4e8c\u3001strtoupper()\u51fd\u6570<\/h2>\n
strtoupper()\u51fd\u6570\u4e0estrtolower()\u51fd\u6570\u76f8\u53cd\uff0c\u5b83\u5c06\u5b57\u7b26\u4e32\u4e2d\u7684\u6240\u6709\u5b57\u6bcd\u5b57\u7b26\u8f6c\u6362\u4e3a\u5927\u5199\u5f62\u5f0f\u3002\u540c\u6837\uff0c\u975e\u5b57\u6bcd\u5b57\u7b26\u5c06\u4fdd\u6301\u4e0d\u53d8\u3002<\/p>\n
\u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u4e86strtoupper()\u51fd\u6570\u7684\u7528\u6cd5\uff1a<\/p>\n
$str = \"Hello World!\";\n$uppercase = strtoupper($str);\necho $uppercase; \/\/ \u8f93\u51fa\uff1aHELLO WORLD!<\/code><\/pre>\n
strtoupper()\u51fd\u6570\u901a\u5e38\u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\uff0c\u4f8b\u5982\u7528\u4e8e\u6570\u636e\u9a8c\u8bc1\u6216\u6807\u51c6\u5316\u3002<\/p>\n
\u4e09\u3001ucfirst()\u51fd\u6570<\/h2>\n
ucfirst()\u51fd\u6570\u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u7684\u9996\u5b57\u6bcd\u8f6c\u6362\u4e3a\u5927\u5199\u3002\u5b83\u63a5\u53d7\u4e00\u4e2a\u5b57\u7b26\u4e32\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\uff0c\u5176\u4e2d\u540d\u5217\u524d\u8305\u4e2a\u5b57\u6bcd\u88ab\u8f6c\u6362\u4e3a\u5927\u5199\u5f62\u5f0f\uff0c\u5176\u4ed6\u5b57\u6bcd\u4fdd\u6301\u4e0d\u53d8\u3002<\/p>\n
\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86ucfirst()\u51fd\u6570\u7684\u7528\u6cd5\uff1a<\/p>\n
$str = \"hello world!\";\n$capitalized = ucfirst($str);\necho $capitalized; \/\/ \u8f93\u51fa\uff1aHello world!<\/code><\/pre>\n
ucfirst()\u51fd\u6570\u5e38\u7528\u4e8e\u4f7f\u53e5\u5b50\u6216\u6807\u9898\u7684\u9996\u5b57\u6bcd\u5927\u5199\uff0c\u589e\u5f3a\u6587\u672c\u7684\u53ef\u8bfb\u6027\u3002<\/p>\n
\u56db\u3001ucwords()\u51fd\u6570<\/h2>\n
ucwords()\u51fd\u6570\u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u4e2d\u6bcf\u4e2a\u5355\u8bcd\u7684\u9996\u5b57\u6bcd\u8f6c\u6362\u4e3a\u5927\u5199\u3002\u5b83\u63a5\u53d7\u4e00\u4e2a\u5b57\u7b26\u4e32\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\uff0c\u5176\u4e2d\u6bcf\u4e2a\u5355\u8bcd\u7684\u9996\u5b57\u6bcd\u88ab\u8f6c\u6362\u4e3a\u5927\u5199\u5f62\u5f0f\uff0c\u5176\u4ed6\u5b57\u6bcd\u4fdd\u6301\u4e0d\u53d8\u3002<\/p>\n
\u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u4e86ucwords()\u51fd\u6570\u7684\u7528\u6cd5\uff1a<\/p>\n
$str = \"hello world!\";\n$capitalizedWords = ucwords($str);\necho $capitalizedWords; \/\/ \u8f93\u51fa\uff1aHello World!<\/code><\/pre>\n
ucwords()\u51fd\u6570\u901a\u5e38\u7528\u4e8e\u5c06\u53e5\u5b50\u4e2d\u6bcf\u4e2a\u5355\u8bcd\u7684\u9996\u5b57\u6bcd\u5927\u5199\uff0c\u4f7f\u6587\u672c\u66f4\u52a0\u89c4\u8303\u3002<\/p>\n
\u4e94\u3001lcfirst()\u51fd\u6570<\/h2>\n
lcfirst()\u51fd\u6570\u4e0eucfirst()\u51fd\u6570\u76f8\u53cd\uff0c\u5b83\u5c06\u5b57\u7b26\u4e32\u7684\u9996\u5b57\u6bcd\u8f6c\u6362\u4e3a\u5c0f\u5199\u3002\u5b83\u63a5\u53d7\u4e00\u4e2a\u5b57\u7b26\u4e32\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\uff0c\u5176\u4e2d\u540d\u5217\u524d\u8305\u4e2a\u5b57\u6bcd\u88ab\u8f6c\u6362\u4e3a\u5c0f\u5199\u5f62\u5f0f\uff0c\u5176\u4ed6\u5b57\u6bcd\u4fdd\u6301\u4e0d\u53d8\u3002<\/p>\n
\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86lcfirst()\u51fd\u6570\u7684\u7528\u6cd5\uff1a<\/p>\n
$str = \"Hello World!\";\n$lowercaseFirst = lcfirst($str);\necho $lowercaseFirst; \/\/ \u8f93\u51fa\uff1ahello World!<\/code><\/pre>\n
lcfirst()\u51fd\u6570\u5e38\u7528\u4e8e\u9700\u8981\u5c06\u5b57\u7b26\u4e32\u7684\u540d\u5217\u524d\u8305\u4e2a\u5b57\u6bcd\u8f6c\u6362\u4e3a\u5c0f\u5199\u7684\u60c5\u51b5\uff0c\u4f8b\u5982\u5904\u7406\u53d8\u91cf\u6216\u51fd\u6570\u540d\u3002<\/p>\n
\u516d\u3001mb_strtolower()\u51fd\u6570<\/h2>\n
mb_strtolower()\u51fd\u6570\u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5c0f\u5199\uff0c\u652f\u6301\u591a\u5b57\u8282\u5b57\u7b26\u3002\u4e0estrtolower()\u51fd\u6570\u7c7b\u4f3c\uff0c\u5b83\u63a5\u53d7\u4e00\u4e2a\u5b57\u7b26\u4e32\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\uff0c\u5176\u4e2d\u6240\u6709\u7684\u5b57\u6bcd\u5b57\u7b26\u90fd\u88ab\u8f6c\u6362\u4e3a\u5c0f\u5199\u5f62\u5f0f\u3002\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\uff0cmb_strtolower()\u51fd\u6570\u80fd\u591f\u6b63\u786e\u5904\u7406\u5305\u542b\u591a\u5b57\u8282\u5b57\u7b26\uff08\u5982\u4e2d\u6587\u3001\u65e5\u6587\u7b49\uff09\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n
\u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u4e86mb_strtolower()\u51fd\u6570\u7684\u7528\u6cd5\uff1a<\/p>\n
$str = \"Hello \u4e16\u754c!\";\n$lowercase = mb_strtolower($str, 'UTF-8');\necho $lowercase; \/\/ \u8f93\u51fa\uff1ahello \u4e16\u754c!<\/code><\/pre>\n
mb_strtolower()\u51fd\u6570\u5728\u9700\u8981\u5904\u7406\u591a\u8bed\u8a00\u5b57\u7b26\u7684\u60c5\u51b5\u4e0b\u975e\u5e38\u6709\u7528\u3002<\/p>\n
\u4e03\u3001mb_strtoupper()\u51fd\u6570<\/h2>\n
mb_strtoupper() \u51fd\u6570\u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u5f62\u5f0f\uff0c\u5e76\u652f\u6301\u591a\u5b57\u8282\u5b57\u7b26\u3002\u4e0estrtoupper() \u51fd\u6570\u7c7b\u4f3c\uff0c\u4f46mb_strtoupper() \u51fd\u6570\u80fd\u591f\u6b63\u786e\u5904\u7406\u5305\u542b\u591a\u5b57\u8282\u5b57\u7b26\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n
\u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u4e86mb_strtoupper() \u51fd\u6570\u7684\u7528\u6cd5\uff1a<\/p>\n
$str = \"hello \u4e16\u754c!\";\n$uppercase = mb_strtoupper($str, 'UTF-8');\necho $uppercase; \/\/ \u8f93\u51fa\uff1aHELLO \u4e16\u754c!<\/code><\/pre>\n
\u53ef\u4ee5\u770b\u5230\uff0cmb_strtoupper() \u51fd\u6570\u5c06\u5b57\u7b26\u4e32\u4e2d\u7684\u6240\u6709\u5b57\u6bcd\u5b57\u7b26\u8f6c\u6362\u4e3a\u5927\u5199\u5f62\u5f0f\uff0c\u540c\u65f6\u4fdd\u7559\u975e\u5b57\u6bcd\u5b57\u7b26\u4e0d\u53d8\u3002\u8fd9\u5bf9\u4e8e\u5904\u7406\u5305\u542b\u591a\u8bed\u8a00\u5b57\u7b26\u7684\u5b57\u7b26\u4e32\u975e\u5e38\u6709\u7528\u3002<\/p>\n
\u516b\u3001mb_convert_case()\u51fd\u6570<\/h2>\n
mb_convert_case() \u51fd\u6570\u7528\u4e8e\u6839\u636e\u6307\u5b9a\u7684\u8f6c\u6362\u6a21\u5f0f\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u7279\u5b9a\u5927\u5c0f\u5199\u5f62\u5f0f\u3002\u5b83\u652f\u6301\u591a\u5b57\u8282\u5b57\u7b26\uff0c\u5e76\u4e14\u53ef\u4ee5\u5728\u8f6c\u6362\u8fc7\u7a0b\u4e2d\u4fdd\u7559\u6216\u79fb\u9664\u7279\u5b9a\u5b57\u7b26\u3002<\/p>\n
\u4ee5\u4e0b\u662fmb_convert_case() \u51fd\u6570\u7684\u8bed\u6cd5\uff1a<\/p>\n
mb_convert_case(string $str, int $mode [, string $encoding = mb_internal_encoding()]): string<\/code><\/pre>\n
    \n
  • $str \u662f\u8981\u8f6c\u6362\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n
  • $mode \u662f\u8f6c\u6362\u6a21\u5f0f\uff0c\u53ef\u4ee5\u662fMB_CASE_UPPER\uff08\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u5f62\u5f0f\uff09\u3001MB_CASE_LOWER\uff08\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5c0f\u5199\u5f62\u5f0f\uff09\u6216MB_CASE_TITLE\uff08\u5c06\u5b57\u7b26\u4e32\u4e2d\u6bcf\u4e2a\u5355\u8bcd\u7684\u9996\u5b57\u6bcd\u8f6c\u6362\u4e3a\u5927\u5199\u5f62\u5f0f\uff09\u3002<\/li>\n
  • $encoding \u662f\u53ef\u9009\u53c2\u6570\uff0c\u6307\u5b9a\u5b57\u7b26\u4e32\u7684\u5b57\u7b26\u7f16\u7801\u3002\u5982\u679c\u672a\u6307\u5b9a\uff0c\u5c06\u4f7f\u7528mb_internal_encoding() \u7684\u503c\u3002<\/li>\n<\/ul>\n
    \u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u4e86mb_convert_case() \u51fd\u6570\u7684\u7528\u6cd5\uff1a<\/p>\n
    $str = \"hello \u4e16\u754c!\";\n$converted = mb_convert_case($str, MB_CASE_UPPER, 'UTF-8');\necho $converted; \/\/ \u8f93\u51fa\uff1aHELLO \u4e16\u754c!<\/code><\/pre>\n
    \u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u901a\u8fc7\u5c06\u8f6c\u6362\u6a21\u5f0f\u8bbe\u7f6e\u4e3aMB_CASE_UPPER\uff0c\u6211\u4eec\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u5f62\u5f0f\u3002\u6839\u636e\u8f6c\u6362\u6a21\u5f0f\u7684\u4e0d\u540c\uff0cmb_convert_case() \u51fd\u6570\u53ef\u4ee5\u5b9e\u73b0\u591a\u79cd\u5927\u5c0f\u5199\u8f6c\u6362\u9700\u6c42\u3002<\/p>\n
    \u4e0a\u8ff0\u8fd9\u4e9b\u51fd\u6570\u662f\u5728PHP\u4e2d\u7528\u4e8e\u8f6c\u6362\u5b57\u7b26\u4e32\u5927\u5c0f\u5199\u7684\u5e38\u7528\u5de5\u5177\uff0c\u5b83\u4eec\u5177\u6709\u4e0d\u540c\u7684\u7279\u70b9\u548c\u7528\u9014\u3002\u60a8\u53ef\u4ee5\u6839\u636e\u81ea\u8eab\u5b9e\u9645\u9700\u6c42\uff0c\u9009\u62e9\u5408\u9002\u7684\u51fd\u6570\u53ef\u4ee5\u66f4\u65b9\u4fbf\u5730\u5b8c\u6210\u5b57\u7b26\u4e32\u5927\u5c0f\u5199\u8f6c\u6362\u7684\u4efb\u52a1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"php\u8f6c\u6362\u5927\u5c0f\u5199\u7684\u51fd\u6570\u6709\uff1a\u4e00\u3001strtolower()\u51fd\u6570\uff1b\u4e8c\u3001strtoupper()\u51fd\u6570\uff1b\u4e09\u3001ucfirs […]","protected":false},"author":1,"featured_media":34457,"comment_status":"closed","ping_status":"open","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\/34456"}],"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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=34456"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/34456\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/34457"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=34456"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=34456"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=34456"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}