{"id":30091,"date":"2023-03-02T04:23:57","date_gmt":"2023-05-14T23:08:30","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90php%e3%80%91php%e5%9f%ba%e7%a1%80%e6%80%bb%e7%bb%93%e2%91%a0\/"},"modified":"2025-08-12T17:30:23","modified_gmt":"2025-08-12T09:30:23","slug":"%e3%80%90php%e3%80%91php%e5%9f%ba%e7%a1%80%e6%80%bb%e7%bb%93%e2%91%a0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90php%e3%80%91php%e5%9f%ba%e7%a1%80%e6%80%bb%e7%bb%93%e2%91%a0\/","title":{"rendered":"\u3010PHP\u3011PHP\u57fa\u7840\u603b\u7ed3\u2460"},"content":{"rendered":"

\u811a\u672c\u7684\u8f93\u5165<\/p>\n
<?php<\/span>\r\n    echo<\/span> \"Hello PHP\"<\/span>;<\/span>\r\n?><\/span>\r\n<\/code><\/pre>\n
\u4ee5\u4e0b\u662f\u8c0b\u751f\u6307\u5357<\/p>\n
<<<(ID)\r\n\r\n\u8907\u6570\u884c\u306b\u307e\u305f\u304c\u308b\u6587\u5b57\u5217\r\n\r\n(ID)\r\n<\/code><\/pre>\n
\u53d8\u91cf\u4e0e\u8d4b\u503c<\/p>\n
<?php<\/span>\r\n    \/\/ \u5909\u6570\u3092\u4f7f\u3063\u305f\u7c21\u5358\u306a\u30b9\u30af\u30ea\u30d7\u30c8\u306e\u4f8b<\/span>\r\n    $a<\/span> =<\/span> 10<\/span>;<\/span>\r\n    $b<\/span> =<\/span> 2<\/span>;<\/span>\r\n    \/\/ $c\u306b$a\u3068$b\u306e\u548c\u3092\u4ee3\u5165<\/span>\r\n    $c<\/span> =<\/span> $a<\/span> +<\/span> $b<\/span>;<\/span>\r\n    \/\/ $a+$b\u306e\u8a08\u7b97\u7d50\u679c\u3092\u8868\u793a<\/span>\r\n    echo<\/span> $a<\/span> .<\/span> \"+\"<\/span> .<\/span> $b<\/span> .<\/span> \"=\"<\/span> .<\/span> $c<\/span>;<\/span>\r\n?><\/span>\r\n<\/code><\/pre>\n
var_dump\u51fd\u6570\u30fb\u67e5\u8be2$variable\u53d8\u91cf\u7684\u503c\u548c\u7c7b\u578b<\/p>\n
var_dump($variable);\r\n<\/code><\/pre>\n
\u82e5\u662f<\/p>\n
\u30fbif\u6587\u306e\u66f8\u5f0f\r\nif (\u6761\u4ef6\u5f0f) {\r\n    \u51e6\u7406\r\n}\r\n<\/code><\/pre>\n
\u5176\u4ed6\u60c5\u51b5\u4e0b\u7684\u6587\u672c\u5176\u4ed6\u6761\u4ef6\u4e0b\u7684\u6587\u672c\u683c\u5f0f<\/p>\n
if (\u6761\u4ef6\u5f0f) {\r\n    \u51e6\u7406\uff11;\r\n} else {\r\n    \u51e6\u7406\uff12;\r\n}\r\n<\/code><\/pre>\n
\u5982\u679c\u5176\u4ed6\u6761\u4ef6\u4e0d\u6ee1\u8db3, \u5219\u6267\u884cif\u6587\u30fb\u5176\u4ed6\u5982\u679c\u8bed\u53e5\u7684\u683c\u5f0f<\/p>\n
if (\u6761\u4ef6\u5f0f\u2460) {\r\n    \u51e6\u7406;\r\n} else if (\u6761\u4ef6\u5f0f\u2461) {\r\n    \u51e6\u7406;\r\n} else {\r\n    \u51e6\u7406;\r\n}\r\n<\/code><\/pre>\n
\u5f00\u5173\u8bed\u53e5\u30fb\u5f00\u5173\u8bed\u53e5\u7684\u683c\u5f0f<\/p>\n
switch (\u5024) {\r\ncase \u5024\uff11:\r\n    \u51e6\u7406;\r\n    break;\r\ncase \u5024\uff12:\r\n    \u51e6\u7406;\r\n    break;\r\ndefault:\r\n    \u51e6\u7406;\r\n}\r\n<\/code><\/pre>\n
for the document\u30fbfor\u5faa\u73af\u7684\u683c\u5f0f<\/p>\n
for (\u521d\u671f\u5316\u51e6\u7406; \u6761\u4ef6\u5f0f; \u5897\u5206\u51e6\u7406) {\r\n    \u51e6\u7406\r\n}\r\n<\/code><\/pre>\n
\u5f53\u6587\u5f53\u6587\u7684\u683c\u5f0f<\/p>\n
while  (\u6761\u4ef6\u5f0f) {\r\n    \u51e6\u7406\r\n}\r\n<\/code><\/pre>\n
\u505a~\u5f53\u6587\u30fb\u5f53\u5bf9\u67d0\u4e2a\u6761\u4ef6\u7684\u60c5\u51b5\u4e0b<\/p>\n
do {\r\n    \u51e6\u7406\r\n} while(\u6761\u4ef6\u5f0f);\r\n<\/code><\/pre>\n
\u6392\u5217\u30fb\u751f\u6210\u6570\u7ec4<\/p>\n
[\u50241, \u5024\uff12, \u30fb\u30fb\u30fb]\r\n<\/code><\/pre>\n
\u6570\u7ec4\u64cd\u4f5c<\/p>\n
<?php<\/span> \r\n    echo<\/span> \"(1)\u3000\u914d\u5217\u306e\u521d\u671f\u5024<br>\"<\/span>;<\/span>\r\n    $ar<\/span> =<\/span> [<\/span>\"orange\"<\/span>,<\/span> \"apple\"<\/span>,<\/span> \"banana\"<\/span>];<\/span>\r\n    print_r<\/span>(<\/span>$ar<\/span>);<\/span>\r\n    echo<\/span> \"<br>(2)\u30002\u756a\u76ee\u306e\u5024\u3092\u300cpineapple\u300d\u306b\u5909\u66f4<br>\"<\/span>;<\/span>\r\n    $ar<\/span>[<\/span>2<\/span>]<\/span> =<\/span> \"pineapple\"<\/span>;<\/span>\r\n    print_r<\/span>(<\/span>$ar<\/span>);<\/span>\r\n    echo<\/span> \"<br>(3) \u914d\u5217\u306e\u672b\u5c3e\u306e\u524a\u9664<br>\"<\/span>;<\/span>\r\n    array_pop<\/span>(<\/span>$ar<\/span>);<\/span>\r\n    print_r<\/span>(<\/span>$ar<\/span>);<\/span>\r\n    echo<\/span> \"<br>(4) \u914d\u5217\u306e\u672b\u5c3e\u306b\u8981\u7d20\u3092\u8ffd\u52a0<br>\"<\/span>\r\n    array_push<\/span>(<\/span>$ar<\/span>,<\/span> \"cherry\"<\/span>,<\/span> \"lemon\"<\/span>);<\/span>\r\n    print_r<\/span>(<\/span>$ar<\/span>);<\/span>\r\n    echo<\/span> \"<br>(5) \u914d\u5217\u306e\u5148\u982d\u3092\u524a\u9664<br>\"<\/span>\r\n    array_shift<\/span>(<\/span>$ar<\/span>);<\/span>\r\n    print_r<\/span>(<\/span>$ar<\/span>);<\/span>\r\n    echo<\/span> \"<br>(6)\u914d\u5217\u306e\u5148\u982d\u306b\u8981\u7d20\u3092\u8ffd\u52a0<br>\"<\/span>\r\n    array_unshift<\/span>(<\/span>$ar<\/span>,<\/span> \"peach\"<\/span>);<\/span>\r\n    print_r<\/span>(<\/span>$ar<\/span>);<\/span>\r\n    echo<\/span> \"<br>(7)\u914d\u5217\u306e\u8981\u7d20\u3092\u524a\u9664<br>\"<\/span>;<\/span>\r\n    unset<\/span>(<\/span>$ar<\/span>[<\/span>2<\/span>]);<\/span>\r\n    print_r<\/span>(<\/span>$ar<\/span>);<\/span>\r\n    echo<\/span> \"<br>(8)<\/span>$ar\u306e\u914d\u5217\u306e\u756a\u53f7\u306e\u632f\u308a\u306a\u304a\u3059<\/span><br>\"<\/span>;<\/span>\r\n    $ar<\/span> =<\/span> array_values<\/span>(<\/span>$ar<\/span>);<\/span>\r\n    print_r<\/span>(<\/span>$ar<\/span>);<\/span>\r\n?><\/span>\r\n<\/code><\/pre>\n
\u5207\u7247\u7684\u6570\u7ec4<\/p>\n
<?php<\/span>\r\n    echo<\/span> \"\u914d\u5217<\/span>\\$<\/span>ar1\u306e\u521d\u671f\u5024<br>\"<\/span>;<\/span>\r\n    $ar1<\/span> =<\/span> [<\/span>\"a\"<\/span>,<\/span> \"b\"<\/span>,<\/span> \"c\"<\/span>,<\/span> \"d\"<\/span>,<\/span> \"e\"<\/span>,];<\/span> \/\/ \u914d\u5217$ar1\u306e\u521d\u671f\u5024<\/span>\r\n    print_r<\/span>(<\/span>$ar1<\/span>);<\/span>\r\n    echo<\/span> \"<br><\/span>\\$<\/span>ar2:1\u756a\u76ee\u304b\u3089\uff12\u3064\u306e\u8981\u7d20\u3092\u5207\u308a\u53d6\u308a\uff08\u6dfb\u5b57\u306e\u756a\u53f70\u304b\u3089\uff09<br>\"<\/span>;<\/span>\r\n    $ar2<\/span> =<\/span> array_slice<\/span>(<\/span>$ar1<\/span>,<\/span> 1<\/span>,<\/span> 2<\/span>);<\/span> \/\/ \u8981\u7d20\u306e\u5207\u308a\u53d6\u308a\u2460<\/span>\r\n    print_r<\/span>(<\/span>$ar2<\/span>);<\/span>\r\n    echo<\/span> \"<br><\/span>\\$<\/span>ar3:1\u756a\u76ee\u304b\u3089\uff12\u3064\u306e\u8981\u7d20\u3092\u5207\u308a\u53d6\u308a\uff08\u6dfb\u5b57\u306e\u756a\u53f7\u3092\u4fdd\u6301\uff09<br>\"<\/span>;<\/span>\r\n    $ar3<\/span> =<\/span> array_slice<\/span>(<\/span>$ar1<\/span>,<\/span> 1<\/span>,<\/span> 2<\/span>,<\/span> true<\/span>);<\/span> \/\/ \u8981\u7d20\u306e\u5207\u308a\u53d6\u308a\u2461<\/span>\r\n    print_r<\/span>(<\/span>$ar3<\/span>);<\/span>\r\n?><\/span>\r\n<\/code><\/pre>\n
\u6570\u7ec4\u7684\u5408\u5e76<\/p>\n
<?php<\/span>\r\n    \/\/ \u914d\u5217$ar1\u3001$ar2\u306e\u521d\u671f\u5024 <\/span>\r\n    $ar1<\/span> =<\/span> [<\/span>\"a\"<\/span>,<\/span> \"b\"<\/span>];<\/span>\r\n    $ar2<\/span> =<\/span> [<\/span>\"c\"<\/span>,<\/span> \"d\"<\/span>,<\/span> \"e\"<\/span>];<\/span>\r\n    $result<\/span> =<\/span> array_merge<\/span>(<\/span>$ar1<\/span>,<\/span> $ar2<\/span>);<\/span> \/\/\u3000\u914d\u5217\u3092\u7d50\u5408\u3059\u308b <\/span>\r\n    print_r<\/span>(<\/span>$result<\/span>);<\/span>\r\n?><\/span>\r\n<\/code><\/pre>\n
\u8fde\u7eed\u6570\u7ec4<\/p>\n
\u94fe\u7d22\u6570\u7ec4\u7684\u5b9a\u4e49\u30fb\u9023\u60f3\u914d\u5217\u7684\u5b9a\u4e49\u683c\u5f0f<\/p>\n
[\u30ad\u30fc1=>\u50241, \u30ad\u30fc2=>\u50242,\u30fb\u30fb\u30fb];\r\n<\/code><\/pre>\n
\u6dfb\u52a0\u548c\u5220\u9664\u7684\u8981\u7d20<\/p>\n
<?php<\/span>\r\n    $animals<\/span> =<\/span> [<\/span>\"dog\"<\/span>=><\/span>\"\u72ac\"<\/span>,<\/span> \"cat\"<\/span>=><\/span>\"\u732b\"<\/span>,<\/span> \"bird\"<\/span>=><\/span>\"\u9ce5\"<\/span>];<\/span>\r\n    print_r<\/span>(<\/span>$animals<\/span>);<\/span>\r\n    $animals<\/span>[<\/span>\"dog\"<\/span>]<\/span> =<\/span> \"\u3044\u306c\"<\/span>;<\/span> \/\/ \"dog\"\u306e\u5024\u3092\"\u72ac\"\u304b\u3089\"\u3044\u306c\"\u306b\u5909\u66f4<\/span>\r\n    echo<\/span> \"<br>\"<\/span>;<\/span>\r\n    print_r<\/span>(<\/span>$animals<\/span>);<\/span>\r\n    $animals<\/span>[<\/span>\"horse\"<\/span>]<\/span> =<\/span> \"\u99ac\"<\/span>;<\/span> \/\/ \"horse\"\u3092\u30ad\u30fc\"\u99ac\"\u3092\u5024\u3068\u3057\u3066\u8ffd\u52a0<\/span>\r\n    echo<\/span> \"<br>\"<\/span>;<\/span>\r\n    print_r<\/span>(<\/span>$animals<\/span>);<\/span>\r\n    unset<\/span>(<\/span>$animals<\/span>[<\/span>\"cat\"<\/span>]);<\/span> \/\/ \u30ad\u30fc\"cat\"\u306e\u8981\u7d20\u3092\u524a\u9664<\/span>\r\n    echo<\/span> \"<br>\"<\/span>;<\/span>\r\n    print_r<\/span>(<\/span>$animals<\/span>);<\/span>\r\n?><\/span>\r\n<\/code><\/pre>\n
\u904d\u5386\u5faa\u73af\u30fbforeach\u7684\u683c\u5f0f<\/p>\n
foreach (\u914d\u5217\u5909\u6570 as\u3000\u5909\u6570) {\r\n    \u51e6\u7406\r\n}\r\n<\/code><\/pre>\n
\u4f7f\u7528foreach\u5faa\u73af\u83b7\u53d6\u952e\u548c\u503c\u7684\u4e24\u8005\u3002\u83b7\u53d6\u6570\u7ec4\u7684\u952e\u548c\u503c\u4e24\u8005\u90fd\u8981\u4f7f\u7528\u7684\u683c\u5f0f<\/p>\n
foreach (\u914d\u5217\u5909\u6570 as \u5909\u6570A => \u5909\u6570B) {\r\n    \u51e6\u7406\r\n}\r\n<\/code><\/pre>\n
\u51fd\u6570 sh\u00f9)<\/p>\n
\u51fd\u6570\u7684\u5b9a\u4e49 sh\u00f9 de y\u00ec)\u51fd\u6570\u5b9a\u4e49\u7684\u683c\u5f0f<\/p>\n
function \u95a2\u6570\u540d(\u5f15\u6570\uff11,\u3000\u5f15\u6570\uff12, \u30fb\u30fb\u30fb) {\r\n    \u51e6\u7406\r\n    return \u623b\u308a\u5024;\r\n}\r\n<\/code><\/pre>\n
\u4ee5\u53c2\u7167\u6bd4\u7167\u4e3a\u57fa\u51c6<\/p>\n
<?php<\/span>\r\n    \/\/ \u5024\u6e21\u3057\u306e\u95a2\u6570<\/span>\r\n    function<\/span> job_set1<\/span>(<\/span>$param<\/span>)<\/span> {<\/span>\r\n        $param<\/span> =<\/span> \"\u4f1a\u793e\u54e1\"<\/span>;<\/span>\r\n    }<\/span>\r\n     \/\/\u3000\u53c2\u7167\u6e21\u3057\u306e\u95a2\u6570<\/span>\r\n    function<\/span> job_set2<\/span>(<\/span>&<\/span>$param<\/span>)<\/span> {<\/span>\r\n        $param<\/span> =<\/span> \"\u81ea\u55b6\u696d\"<\/span>;<\/span>\r\n    }<\/span>\r\n    \/\/ \u8077\u696d\u306e\u521d\u671f\u5024<\/span>\r\n    $taro_job<\/span> =<\/span> \"\u516c\u52d9\u54e1\"<\/span>;<\/span>\r\n    $hanako_job<\/span> =<\/span>\"\u516c\u52d9\u54e1\"<\/span>;<\/span>\r\n    \/\/ \u95a2\u6570\u306e\u547c\u3073\u51fa\u3057<\/span>\r\n    job_set1<\/span>(<\/span>$taro_job<\/span>);<\/span>\r\n    job_set2<\/span>(<\/span>$hanako_job<\/span>);<\/span>\r\n    \/\/ \u7d50\u679c\u306e\u8868\u793a<\/span>\r\n    echo<\/span> \"\u592a\u90ce\u306e\u8077\u696d\u306f<\/span>{<\/span>$taro_job<\/span>}<\/span>\u3067\u3059\u3002<br>\"<\/span>;<\/span>\r\n    echo<\/span> \"\u82b1\u5b50\u306e\u306e\u8077\u696d\u306f<\/span>{<\/span>$hanako_job<\/span>}<\/span>\u3067\u3059\u3002<br>\"<\/span>;<\/span>\r\n?><\/span>\r\n<\/code><\/pre>\n
\u30fb\u6267\u884c\u7ed3\u679c<\/p>\n
\u592a\u90ce\u306e\u8077\u696d\u306f\u516c\u52d9\u54e1\u3067\u3059\u3002\r\n\u82b1\u5b50\u306e\u8077\u696d\u306f\u81ea\u55b6\u696d\u3067\u3059\u3002\r\n<\/code><\/pre>\n
\u4f7f\u7528\u5404\u79cd\u51fd\u6570<\/p>\n
\u4e0e\u6587\u5b57\u4e32\u76f8\u5173\u7684\u51fd\u6570<\/p>\n
<?php<\/span>\r\n    \/\/ \u6587\u5b57\u5217\u306e\u8a2d\u5b9a<\/span>\r\n    $str<\/span> =<\/span> \"HTML\u3068PHP\u306e\u5b66\u7fd2\"<\/span>;<\/span>\r\n    echo<\/span> \"<\/span>\\$<\/span>str=\u300c<\/span>{<\/span>$str<\/span>}<\/span>\u300d<br><br>\"<\/span>;<\/span>\r\n\r\n    \/\/\u3000\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u6c42\u3081\u308b\uff08mb_strlen\u95a2\u6570\uff09<\/span>\r\n    $length<\/span> =<\/span> mb_strlen<\/span>(<\/span>$str<\/span>);<\/span>\r\n    echo<\/span> \"<\/span>\\$<\/span>str\u306e\u9577\u3055\u306f<\/span>{<\/span>$length<\/span>}<\/span>\u6587\u5b57\u3067\u3059\u3002<br>\"<\/span>;<\/span>\r\n\r\n    \/\/\u3000\u6587\u5b57\u5217\u306e5\u6587\u5b57\u76ee\u304b\u30893\u6587\u5b57\u5207\u308a\u53d6\u308b\uff08mb_substr\u95a2\u6570\uff09<\/span>\r\n    $sub<\/span> =<\/span> mb_substr<\/span>(<\/span>$str<\/span>,<\/span> 5<\/span>,<\/span> 3<\/span>);<\/span>\r\n    echo<\/span> \"<\/span>\\$<\/span>str\u30925\u6587\u5b57\u76ee\u304b\u30893\u6587\u5b57\u5207\u308a\u53d6\u308b\u3068\u300c<\/span>{<\/span>$sub<\/span>}<\/span>\u300d\u3067\u3059\u3002<br>\"<\/span>;<\/span>\r\n\r\n    \/\/\u3000\u6587\u5b57\u5217\u306e\u4e2d\u304b\u3089\u300c\u5b66\u7fd2\u300d\u3092\u691c\u7d22\uff08mb_strpos\u95a2\u6570\uff09<\/span>\r\n    $srch<\/span> =<\/span> \"\u5b66\u7fd2\"<\/span>;<\/span>\r\n    $result<\/span> =<\/span> mb_strpos<\/span>(<\/span>$str<\/span>,<\/span> $srch<\/span>);<\/span>\r\n    echo<\/span> \"\u300c<\/span>{<\/span>$srch<\/span>}<\/span>\u300d\u306f\u3001<\/span>\\$<\/span>str\u306e<\/span>{<\/span>$result<\/span>}<\/span>\u6587\u5b57\u76ee\u306b\u542b\u307e\u308c\u307e\u3059\u3002<br>\"<\/span>;<\/span>\r\n\r\n    \/\/\u3000\u6587\u5b57\u5217\u3092HTML\u304b\u3089Web\u306b\u7f6e\u304d\u63db\u3048\u308b\uff08str_replace\u95a2\u6570\uff09<\/span>\r\n    $srch<\/span> =<\/span> \"HTML\"<\/span>;<\/span>\r\n    $replace<\/span> =<\/span> \"Web\"<\/span>;<\/span>\r\n    $result<\/span> =<\/span> str_replace<\/span>(<\/span>$srch<\/span>,<\/span> $replace<\/span>,<\/span> $str<\/span>);<\/span>\r\n    echo<\/span> \"<\/span>\\$<\/span>str\u306e\u300c<\/span>{<\/span>$srch<\/span>}<\/span>\u300d\u3092\u300c<\/span>{<\/span>$replace<\/span>}<\/span>\u300d\u306b\u3059\u308b\u3068\u300c<\/span>{<\/span>$result<\/span>}<\/span>\u300d\u306b\u306a\u308a\u307e\u3059\u3002<br>\"<\/span>;<\/span>\r\n?><\/span>\r\n<\/code><\/pre>\n
preg_match\u51fd\u6570 -> \u5339\u914d\u51fd\u6570\u30fbpreg_match\u51fd\u6570\u7684\u683c\u5f0f<\/p>\n
preg_match(\u30d1\u30bf\u30fc\u30f3, \u5bfe\u8c61\u306e\u6587\u5b57\u5217)\r\n<\/code><\/pre>\n
\u5224\u65ad\u51fd\u6570<\/p>\n
<!DOCTYPE html><\/span>\r\n<html><\/span>\r\n    <head><\/span>\r\n        <title><\/span>\u5186\u306e\u9762\u7a4d\u3068\u5186\u5468\u306e\u9577\u3055\u3092\u6c42\u3081\u308b<\/title><\/span>\r\n        <meta<\/span> charset=<\/span>\"UTF-8\"<\/span>><\/span>\r\n    <\/head><\/span>\r\n    <body><\/span>\r\n        <h1><\/span>\u5186\u306e\u9762\u7a4d\u3068\u5186\u5468\u306e\u9577\u3055\u3092\u6c42\u3081\u308b<\/h1><\/span>\r\n        <!-- \u6570\u5024\u5165\u529b\u30d5\u30a9\u30fc\u30e0 --><\/span>\r\n        <form<\/span> method=<\/span>\"POST\"<\/span> action=<\/span>\"sample5-9.php\"<\/span>><\/span>\r\n        <p><b><\/span>\u5186\u306e\u534a\u5f84\u3000(cm) :\u6b63\u306e\u6570\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044<\/b><\/p><\/span>\r\n        <input<\/span> type=<\/span>\"text\"<\/span> name=<\/span>\"radius\"<\/span>><\/span>\r\n        <br><\/span>\r\n            <p><\/span>\r\n            <?php<\/span>\r\n                \/\/\u3000\u534a\u5f84\u304c\u5165\u529b\u3055\u308c\u3066\u3044\u308b\u304b\u306e\u78ba\u8a8d<\/span>\r\n                if<\/span> (<\/span>isset<\/span>(<\/span>$_post<\/span>[<\/span>\"radius\"<\/span>]))<\/span> {<\/span>\r\n                    \/\/\u3000\u534a\u5f84\u3092$r\u306b\u4ee3\u5165\u3057\u6b63\u898f\u8868\u73fe\u3067\u578b\u30c1\u30a7\u30c3\u30af<\/span>\r\n                    $r<\/span> =<\/span> $_POST<\/span>[<\/span>\"radius\"<\/span>];<\/span>\r\n                    if<\/span> (<\/span>preg_match<\/span>(<\/span>\"\/^([1-9]\\d*|0)(\\.\\d+)?$\/\"<\/span>,<\/span> $r<\/span>)<\/span> ==<\/span> 1<\/span>)<\/span> {<\/span>\r\n                        if<\/span>(<\/span>$r<\/span> ><\/span> 0.0<\/span>)<\/span> {<\/span>\r\n                            $pi<\/span> =<\/span> 3.14<\/span>;<\/span>\r\n                            $area<\/span> =<\/span> $pi<\/span> *<\/span> $r<\/span> *<\/span> $r<\/span>;<\/span>\r\n                            $cir<\/span> =<\/span> 2<\/span> *<\/span> $pi<\/span> *<\/span> $r<\/span>;<\/span>\r\n                            echo<\/span> \"<p>\u9762\u7a4d:<\/span>{<\/span>$area<\/span>}<\/span>cm2&nbsp;\u5186\u5468:<\/span>{<\/span>$cir<\/span>}<\/span>cm<\/p>\"<\/span>;<\/span>\r\n                        }<\/span> else<\/span> {<\/span>\r\n                            echo<\/span> \"<p>\u534a\u5f84\u306b\u306f\u6b63\u306e\u6570\u3092\u5165\u529b\u3057\u3066\u4e0b\u3055\u3044<\/p>\"<\/span>;<\/span>\r\n                        }<\/span>\r\n                    }<\/span> else<\/span> {<\/span>\r\n                        echo<\/span> \"<p>\u534a\u5f84\u306b\u306f\u6b63\u306e\u6570\u3092\u5165\u529b\u3057\u3066\u4e0b\u3055\u3044<\/p>\"<\/span>;<\/span>\r\n                    }<\/span>\r\n                }<\/span>\r\n            ?><\/span>\r\n            <input<\/span> type=<\/span>\"submit\"<\/span> value=<\/span>\"\u8a08\u7b97\u3059\u308b\"<\/span>><\/span>\r\n        <\/form><\/span>\r\n    <\/body><\/span>\r\n<\/html><\/span>\r\n<\/code><\/pre>\n
\u4ec5\u63d0\u4f9b\u4e00\u79cd\u9009\u9879\uff0c\u4ee5\u4e0b\u662f\u539f\u6587\u7684\u6c49\u8bed\u672c\u5730\u5316\u6539\u5199\uff1a\u53c2\u8003\u6587\u732e<\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
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