{"id":189,"date":"2010-12-08T18:52:10","date_gmt":"2010-12-08T09:52:10","guid":{"rendered":"http:\/\/labo.samuraistyle.org\/blog\/?p=189"},"modified":"2016-06-18T00:45:38","modified_gmt":"2016-06-17T15:45:38","slug":"php%e3%81%a7%e4%b9%b1%e6%95%b0%e3%82%92%e7%94%9f%e6%88%90%e3%81%99%e3%82%8brand%e3%82%92%e8%aa%bf%e3%81%b9%e3%81%9f","status":"publish","type":"post","link":"https:\/\/labo.samuraistyle.org\/blog\/archives\/189","title":{"rendered":"PHP\u3067\u4e71\u6570\u3092\u751f\u6210\u3059\u308brand()\u3092\u8abf\u3079\u305f"},"content":{"rendered":"<p>http:\/\/www.php.net\/manual\/ja\/function.srand.php \u3092\u898b\u308b\u3068\u3001<\/p>\n<blockquote><p>\u6ce8\u610f: PHP 4.2.0 \u4ee5\u964d\u3001 srand() \u307e\u305f\u306f mt_srand() \u306b\u3088\u308a\u30e9\u30f3\u30c0\u30e0\u6570\u751f\u6210\u5668\u306b\u30b7\u30fc\u30c9\u3092\u4e0e\u3048\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002 \u3053\u308c\u306f\u3001\u3053\u306e\u51e6\u7406\u304c\u81ea\u52d5\u7684\u306b\u884c\u308f\u308c\u308b\u305f\u3081\u3067\u3059\u3002<\/p><\/blockquote>\n<p>\u3068\u3001\u3042\u3063\u305f\u306e\u3067\u3001\u3069\u3093\u306a\u3082\u3093\u304b\u3068\u691c\u7d22\u3057\u3066\u307f\u305f\u3068\u3053\u308d <a href=\"http:\/\/d.hatena.ne.jp\/yoya\/20080807\" target=\"_blank\">http:\/\/d.hatena.ne.jp\/yoya\/20080807<\/a> \u306b\u884c\u304d\u7740\u3044\u305f\u3002<\/p>\n<p>\u3067\u3001\u5b9f\u969b\u3069\u3046\u306a\u3063\u3066\u308b\u3093\u3060\uff1f\u3068\u601d\u3044\u30bd\u30fc\u30b9\u3092\u8abf\u3079\u3066\u307f\u305f\u3002<\/p>\n<p>\/ext\/standard\/rand.c \u306e65\u884c\u76ee\u306b<\/p>\n<pre><code>php_srand(GENERATE_SEED() TSRMLS_CC);<\/code><\/pre>\n<p>\u304c\u3042\u3063\u3066\u3001\u3053\u308c\u304c \/ext\/standard\/php_rand.h \u306e 52\u884c\u76ee\u306e<\/p>\n<pre><code>#define GENERATE_SEED() ((long) (time(0) * getpid() * 1000000 * php_combined_lcg(TSRMLS_C)))<\/code><\/pre>\n<p>\u3067\u3001php_combined_lcg\u306f \/ext\/standard\/lcg.c \u306b\u3042\u3063\u3066\u3001\u305d\u3053\u304b\u3089lcg_seed()\u306b\u884c\u304d\u7740\u3044\u305f\u3093\u3060\u3051\u3069\u3001<\/p>\n<pre><code>if (gettimeofday(&amp;tv, NULL) == 0) {\r\nLCG(s1) = tv.tv_sec ^ (~tv.tv_usec);\r\n} else {\r\nLCG(s1) = 1;\r\n}<\/code><\/pre>\n<p>\u4ee5\u4e0b\u306e\u90e8\u5206\u3067\u306a\u305c\u30e9\u30f3\u30c0\u30e0\u306b\u306a\u308b\u306e\u304b\u826f\u304f\u308f\u304b\u3089\u305a\u3002\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>http:\/\/www.php.net\/manual\/ja\/function.srand.php \u3092\u898b\u308b\u3068\u3001 \u6ce8\u610f: PHP 4.2.0 \u4ee5\u964d\u3001 srand() \u307e\u305f\u306f mt_srand() \u306b\u3088\u308a\u30e9\u30f3\u30c0\u30e0\u6570\u751f\u6210\u5668\u306b\u30b7\u30fc\u30c9 &hellip; <a href=\"https:\/\/labo.samuraistyle.org\/blog\/archives\/189\" class=\"more-link\">\u7d9a\u304d\u3092\u8aad\u3080 <span class=\"screen-reader-text\">PHP\u3067\u4e71\u6570\u3092\u751f\u6210\u3059\u308brand()\u3092\u8abf\u3079\u305f<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3],"tags":[6],"class_list":["post-189","post","type-post","status-publish","format-standard","hentry","category-tech","tag-php"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/labo.samuraistyle.org\/blog\/wp-json\/wp\/v2\/posts\/189","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/labo.samuraistyle.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/labo.samuraistyle.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/labo.samuraistyle.org\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/labo.samuraistyle.org\/blog\/wp-json\/wp\/v2\/comments?post=189"}],"version-history":[{"count":6,"href":"https:\/\/labo.samuraistyle.org\/blog\/wp-json\/wp\/v2\/posts\/189\/revisions"}],"predecessor-version":[{"id":730,"href":"https:\/\/labo.samuraistyle.org\/blog\/wp-json\/wp\/v2\/posts\/189\/revisions\/730"}],"wp:attachment":[{"href":"https:\/\/labo.samuraistyle.org\/blog\/wp-json\/wp\/v2\/media?parent=189"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/labo.samuraistyle.org\/blog\/wp-json\/wp\/v2\/categories?post=189"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/labo.samuraistyle.org\/blog\/wp-json\/wp\/v2\/tags?post=189"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}