{"id":1947,"date":"2023-03-01T19:02:24","date_gmt":"2023-03-02T00:02:24","guid":{"rendered":"https:\/\/www.a2life.info\/w\/?p=1947"},"modified":"2025-09-30T23:30:04","modified_gmt":"2025-10-01T03:30:04","slug":"array_reduce%e3%81%ae%e8%a9%b1%e3%80%81%e3%81%9d%e3%81%ae%ef%bc%91","status":"publish","type":"post","link":"https:\/\/www.a2life.info\/w\/?p=1947","title":{"rendered":"array_reduce\u306e\u8a71"},"content":{"rendered":"\n<p>PHP\u3067\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3059\u308b\u3068\u304d\u3001\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30a2\u30ec\u30a3\u304c\u3042\u3063\u305f\u3068\u3059\u308b<\/p>\n\n\n\n<pre class=\"wp-block-code has-light-gray-color has-black-background-color has-text-color has-background has-link-color wp-elements-e103593f39946c6fdd3140dfe22d00e4\"><code lang=\"php\" class=\"language-php\">$fields=array(\"a\"=&gt;\"A\", \"b\"=&gt;\"B\", \"c\"=&gt;\"C\", \"d\"=&gt;\"D\")<\/code><\/pre>\n\n\n\n<p>\u3053\u306e\u5185\u5bb9\u3092\u30ad\u30fc\u3068\u3068\u3082\u306b\u30ea\u30b9\u30c8\u30a2\u30c3\u30d7\u3057\u305f\u3044\u3068\u304d\u3001\u307e\u305a\u601d\u3044\u3064\u304f\u306e\u304cforeach\u3092\u4f7f\u3063\u3066\u3053\u3046\u66f8\u304f\u65b9\u6cd5<\/p>\n\n\n\n<pre class=\"wp-block-code has-light-gray-color has-black-background-color has-text-color has-background has-link-color wp-elements-b32fc8ccc628df193b29650a299ef579\"><code lang=\"php\" class=\"language-php\">\n$output=\"&lt;h3>listing array with foreach&lt;\/h3>\";\nforeach($fields as $key=>$value){\n    $output.=\"&lt;pre>\".$key.\":\"$value.\"&lt;\/pre>\"\n}\necho $output;\n<\/code><\/pre>\n\n\n\n<p>\u305f\u3060\u3001\u3053\u306e\u30a2\u30ec\u30a3\u306e\u8907\u6570\u30a8\u30ec\u30e1\u30f3\u30c8\u3092\u4e00\u3064\u306e\u5024\uff08\u3053\u306e\u5834\u5408\u306f\u4e00\u3064\u306e\u6587\u5b57\u5217\uff09\u306b\u307e\u3068\u3081\u308b\u3068\u3044\u3046\u98a8\u306b\u8003\u3048\u308b\u3068array_reduce\u3068\u3044\u3046\u95a2\u6570\u3092\u4f7f\u3063\u3066\u3082\u540c\u3058\u3053\u3068\u304c\u3067\u304d\u308b<\/p>\n\n\n\n<pre class=\"wp-block-code has-light-gray-color has-black-background-color has-text-color has-background has-link-color wp-elements-37cfec1522d91c69230e68d45dfd43fb\"><code lang=\"php\" class=\"language-php\">\n$output=\"&lt;h3>Listing array with array_reduce&lt;\/h3>\";\n$output=array_reduce(array_keys($fields),fn($curry,$item)=>$curry.\"&lt;pre>\".$item.\":\".$fields[$item].\"&lt;\/pre>\",$output\n);\necho $output;\n<\/code><\/pre>\n\n\n\n<p>\u3053\u306e\u95a2\u6570\u3001\u5358\u7d14\u306aArray\u51e6\u7406\u306f\u554f\u984c\u306a\u3044\u3068\u3057\u3066\u3001Associative\u3000Array\u3092\u51e6\u7406\u3059\u308b\u3068\u306a\u308b\u3068\u3001\u306f\u305f\u3068\u56f0\u308b\u304c\u3001\u6e21\u3059Array\u3092\u5024\u3067\u306f\u306a\u304f\u3001\u30ad\u30fc\u3092\u6e21\u3059\u3053\u3068\u3067\u53ef\u80fd\u3068\u306a\u308b\u3002\u3053\u308c\u306f\u4e00\u3064\u76ee\u306e\u56e0\u6570\u306barray_keys\u3092\u4f7f\u3046\u3053\u3068\u3067\u5b9f\u73fe\u3067\u304d\u308b\u3002\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u306b\u306f\u56e0\u6570\u304c\u4e8c\u3064\u4ed8\u304f\u304c\u3001\u6163\u7fd2\u3068\u3057\u3066$curry \u3068$item\u3068\u3044\u3046\u5909\u6570\u540d\u3092\u4f7f\u3046\u3002for \u6587\u306b$i\u3092\u3064\u304b\u3063\u3066\u3044\u308b\u306e\u3068\u540c\u69d8\u3067\u3001\u3082\u3061\u308d\u3093\u307b\u304b\u306e\u5909\u6570\u540d\u3068\u3057\u3066\u3082\u554f\u984c\u306a\u3044\u3002$curry\u306f\u7d50\u679c\u3092\u96c6\u7a4d\u3057\u3066\u3044\u304f\u5165\u308c\u7269\u3002$item\u306f\u30a2\u30ec\u30a3\u306e\u5404\u30a8\u30ec\u30e1\u30f3\u30c8\u3002\u4e0a\u306e\u4f8b\u3067\u306f\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306f\u30a2\u30ed\u30fc\u30d5\u30a1\u30f3\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u3063\u3066\u30a4\u30f3\u30e9\u30a4\u30f3\u306e\u66f8\u304d\u8fbc\u307f\u3002\u3000\u4e09\u3064\u76ee\u306e\u56e0\u6570\uff08$output)\u306f\u521d\u671f\u5024<\/p>\n\n\n\n<p>\u3053\u306earray_reduce\u306e\u4f7f\u3044\u304b\u305f\u3092\u30cd\u30c3\u30c8\u306e\u691c\u7d22\u306a\u3069\u3067\u63a2\u3059\u3068\u3001\u6570\u5b57\u3092\u52a0\u7b97\u3057\u3066\u3044\u304f\u3088\u3046\u306a\u4f8b\u304c\u3088\u304f\u7d39\u4ecb\u3055\u308c\u3066\u3044\u308b\u304c\u3001\u4e0a\u306e\u3088\u3046\u306b\u6587\u5b57\u5217\u30a2\u30ec\u30a3\u306e\u52a0\u5de5\u306b\u3082\u6709\u52b9\u3002\u3000\u3055\u3089\u306b\u3001\u3053\u306e\u30a2\u30ec\u30a3\u306f\u95a2\u6570\u306e\u30a2\u30ec\u30a3\u3067\u3082\u3088\u3044\u308f\u3051\u3067\u3001\u4f8b\u3048\u3070\u3001\u8907\u6570\u306e\u95a2\u6570\u3067\u540c\u3058\u6587\u5b57\u5217\u306e\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3059\u3088\u3046\u306a\u5834\u5408\u3001\u4f8b\u3048\u3070\u3001\u6587\u5b57\u5217\u3092\u30c8\u30ea\u30e0\u3057\u3042\u3068html\u306b\u30a8\u30f3\u30b3\u30fc\u30c9\u3057\u305f\u3044\u5834\u5408\u306a\u3069\u3001\u3064\u307e\u308a\u540c\u3058\u6587\u5b57\u5217\u306b\u4f55\u5ea6\u3082\u30d1\u30b9\u3092\u304b\u3051\u3066\u52a0\u5de5\u3057\u305f\u3044\u5834\u5408\u306a\u3069<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"php\" class=\"language-php\">$output=trim($output);\n$output=htmlspecialchars($output);\n\/\/\u307e\u305f\u306f\n$output=htmlspecialchars(trim($output));<\/code><\/pre>\n\n\n\n<p>\u306e\u304b\u308f\u308a\u306b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"php\" class=\"language-php\">$output= array_reduce([trim,htmlspecialchars], fn($curry,$item)=&gt;$item($curry),$output)<\/code><\/pre>\n\n\n\n<p>\u3068\u66f8\u3044\u3066\u3057\u307e\u3046\u6280\u304c\u3042\u308b\u3002\u95a2\u6570\u304c\u4e8c\u3064\u306a\u3089\u6700\u521d\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306e\u307b\u3046\u304c\u3088\u3055\u305d\u3046\u3060\u304c\u3001\u304b\u304b\u308f\u308b\u95a2\u6570\u304c\u5897\u3048\u3066\u304f\u308b\u3068\u3001\u30b3\u30fc\u30c9\u306e\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u306f\u4e0b\u306e\u30d1\u30bf\u30fc\u30f3\u306e\u307b\u3046\u304c\u3059\u3063\u304d\u308a\u3059\u308b\u3088\u3001\u3068Functional Programming\u306e\u63a8\u9032\u8005\u305f\u3061\u306f\u3044\u3063\u3066\u3044\u308b\u304c\u3001\u3055\u3066\u3069\u3046\u3059\u308b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"php\" class=\"language-php\">$functionsArray=[fn1,fn2,fn3,fn4,fn5]; \/\/\u540c\u3058\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u30015\u3064\u306e\u95a2\u6570\u51e6\u7406\u3092\u304a\u3053\u306a\u3044\u305f\u3044\n$result=array_reduce($functionArray, fn($curry,$item)=&gt;$item($curry),$initialValue);<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>PHP\u3067\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3059\u308b\u3068\u304d\u3001\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30a2\u30ec\u30a3\u304c\u3042\u3063\u305f\u3068\u3059\u308b \u3053\u306e\u5185\u5bb9\u3092\u30ad\u30fc\u3068\u3068\u3082\u306b\u30ea\u30b9\u30c8\u30a2\u30c3\u30d7\u3057\u305f\u3044\u3068\u304d\u3001\u307e\u305a\u601d\u3044\u3064\u304f\u306e\u304cforeach\u3092\u4f7f\u3063\u3066\u3053\u3046\u66f8\u304f\u65b9\u6cd5 \u305f\u3060\u3001\u3053\u306e\u30a2\u30ec\u30a3\u306e\u8907\u6570\u30a8\u30ec\u30e1\u30f3\u30c8\u3092\u4e00\u3064\u306e\u5024\uff08\u3053\u306e\u5834\u5408\u306f\u4e00\u3064\u306e\u6587\u5b57\u5217\uff09\u306b\u307e\u3068\u3081\u308b\u3068\u3044\u3046\u98a8\u306b\u8003\u3048\u308b\u3068array_reduce\u3068\u3044\u3046\u95a2\u6570\u3092\u4f7f\u3063\u3066\u3082\u540c\u3058\u3053\u3068\u304c\u3067\u304d\u308b \u3053\u306e\u95a2\u6570\u3001\u5358\u7d14\u306aArray\u51e6\u7406\u306f\u554f\u984c\u306a\u3044\u3068\u3057\u3066\u3001Associative\u3000Array\u3092\u51e6\u7406\u3059\u308b\u3068\u306a\u308b\u3068\u3001\u306f\u305f\u3068\u56f0\u308b\u304c\u3001\u6e21\u3059Array\u3092\u5024\u3067\u306f\u306a\u304f\u3001\u30ad\u30fc\u3092\u6e21\u3059\u3053\u3068\u3067\u53ef\u80fd\u3068\u306a\u308b\u3002\u3053\u308c\u306f\u4e00\u3064\u76ee\u306e\u56e0\u6570\u306barray_keys\u3092\u4f7f\u3046\u3053\u3068\u3067\u5b9f\u73fe\u3067\u304d\u308b\u3002\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u306b\u306f\u56e0\u6570\u304c\u4e8c\u3064\u4ed8\u304f\u304c\u3001\u6163\u7fd2\u3068\u3057\u3066$curry \u3068$item\u3068\u3044\u3046\u5909\u6570\u540d\u3092\u4f7f\u3046\u3002for \u6587\u306b$i\u3092\u3064\u304b\u3063\u3066\u3044\u308b\u306e\u3068\u540c\u69d8\u3067\u3001\u3082\u3061\u308d\u3093\u307b\u304b\u306e\u5909\u6570\u540d\u3068\u3057\u3066\u3082\u554f\u984c\u306a\u3044\u3002$curry\u306f\u7d50\u679c\u3092\u96c6\u7a4d\u3057\u3066\u3044\u304f\u5165\u308c\u7269\u3002$item\u306f\u30a2\u30ec\u30a3\u306e\u5404\u30a8\u30ec\u30e1\u30f3\u30c8\u3002\u4e0a\u306e\u4f8b\u3067\u306f\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306f\u30a2\u30ed\u30fc\u30d5\u30a1\u30f3\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u3063\u3066\u30a4\u30f3\u30e9\u30a4\u30f3\u306e\u66f8\u304d\u8fbc\u307f\u3002\u3000\u4e09\u3064\u76ee\u306e\u56e0\u6570\uff08$output)\u306f\u521d\u671f\u5024 \u3053\u306earray_reduce\u306e\u4f7f\u3044\u304b\u305f\u3092\u30cd\u30c3\u30c8\u306e\u691c\u7d22\u306a\u3069\u3067\u63a2\u3059\u3068\u3001\u6570\u5b57\u3092\u52a0\u7b97\u3057\u3066\u3044\u304f\u3088\u3046\u306a\u4f8b\u304c\u3088\u304f\u7d39\u4ecb\u3055\u308c\u3066\u3044\u308b\u304c\u3001\u4e0a\u306e\u3088\u3046\u306b\u6587\u5b57\u5217\u30a2\u30ec\u30a3\u306e\u52a0\u5de5\u306b\u3082\u6709\u52b9\u3002\u3000\u3055\u3089\u306b\u3001\u3053\u306e\u30a2\u30ec\u30a3\u306f\u95a2\u6570\u306e\u30a2\u30ec\u30a3\u3067\u3082\u3088\u3044\u308f\u3051\u3067\u3001\u4f8b\u3048\u3070\u3001\u8907\u6570\u306e\u95a2\u6570\u3067\u540c\u3058\u6587\u5b57\u5217\u306e\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3059\u3088\u3046\u306a\u5834\u5408\u3001\u4f8b\u3048\u3070\u3001\u6587\u5b57\u5217\u3092\u30c8\u30ea\u30e0\u3057\u3042\u3068html\u306b\u30a8\u30f3\u30b3\u30fc\u30c9\u3057\u305f\u3044\u5834\u5408\u306a\u3069\u3001\u3064\u307e\u308a\u540c\u3058\u6587\u5b57\u5217\u306b\u4f55\u5ea6\u3082\u30d1\u30b9\u3092\u304b\u3051\u3066\u52a0\u5de5\u3057\u305f\u3044\u5834\u5408\u306a\u3069 \u306e\u304b\u308f\u308a\u306b \u3068\u66f8\u3044\u3066\u3057\u307e\u3046\u6280\u304c\u3042\u308b\u3002\u95a2\u6570\u304c\u4e8c\u3064\u306a\u3089\u6700\u521d\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306e\u307b\u3046\u304c\u3088\u3055\u305d\u3046\u3060\u304c\u3001\u304b\u304b\u308f\u308b\u95a2\u6570\u304c\u5897\u3048\u3066\u304f\u308b\u3068\u3001\u30b3\u30fc\u30c9\u306e\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u306f\u4e0b\u306e\u30d1\u30bf\u30fc\u30f3\u306e\u307b\u3046\u304c\u3059\u3063\u304d\u308a\u3059\u308b\u3088\u3001\u3068Functional Programming\u306e\u63a8\u9032\u8005\u305f\u3061\u306f\u3044\u3063\u3066\u3044\u308b\u304c\u3001\u3055\u3066\u3069\u3046\u3059\u308b\u3002<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29],"tags":[69],"class_list":["post-1947","post","type-post","status-publish","format-standard","hentry","category-php","tag-php"],"_links":{"self":[{"href":"https:\/\/www.a2life.info\/w\/index.php?rest_route=\/wp\/v2\/posts\/1947","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.a2life.info\/w\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.a2life.info\/w\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.a2life.info\/w\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.a2life.info\/w\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1947"}],"version-history":[{"count":17,"href":"https:\/\/www.a2life.info\/w\/index.php?rest_route=\/wp\/v2\/posts\/1947\/revisions"}],"predecessor-version":[{"id":2199,"href":"https:\/\/www.a2life.info\/w\/index.php?rest_route=\/wp\/v2\/posts\/1947\/revisions\/2199"}],"wp:attachment":[{"href":"https:\/\/www.a2life.info\/w\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1947"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.a2life.info\/w\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1947"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.a2life.info\/w\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1947"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}