{"id":227,"date":"2009-01-10T14:36:08","date_gmt":"2009-01-10T05:36:08","guid":{"rendered":"http:\/\/clouds.tokyo\/blog\/?p=227"},"modified":"2017-02-28T17:36:09","modified_gmt":"2017-02-28T08:36:09","slug":"php_vd_date","status":"publish","type":"post","link":"https:\/\/clouds.tokyo\/blog\/php_vd_date\/","title":{"rendered":"\u3010PHP\u3011\u6b63\u898f\u8868\u73fe\u3067\u65e5\u4ed8(yyyy-mm-dd)\u306e\u30c1\u30a7\u30c3\u30af"},"content":{"rendered":"<p>\u65e5\u4ed8\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u30c1\u30a7\u30c3\u30af\u3067\u3059\u3002\u30b7\u30b9\u30c6\u30e0\u306b\u3088\u3063\u3066\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306f\u7570\u306a\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u304c<br \/>\n\u79c1\u304c\u3088\u304f\u4f7f\u3046\u306e\u306f\u300cyyyy-mm-dd\u300d\u3067\u3059\u3002<\/p>\n<pre>\r\nfunction check_date($caption, $value) {\r\n  if($value == '') {\r\n    return null;\r\n  }\r\n  $preg = '\/^[0-9]{4}-[0-9]{2}-[0-9]{2}$\/';\r\n  if(!preg_match($preg, $value)) {\r\n    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