{"id":13929,"date":"2021-08-17T06:40:01","date_gmt":"2021-08-17T06:40:01","guid":{"rendered":"https:\/\/freehost.page\/?p=13929"},"modified":"2021-08-17T06:40:01","modified_gmt":"2021-08-17T06:40:01","slug":"phan-tich-du-lieu-ngay-thang-nam","status":"publish","type":"post","link":"https:\/\/kiencang.net\/phan-tich-du-lieu-ngay-thang-nam\/","title":{"rendered":"B\u00e0i to\u00e1n ph\u00e2n t\u00edch d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m sinh \u0111\u1ec3 b\u00e1o c\u00e1o s\u01a1 b\u1ed9 c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u hi\u1ec7n c\u00f3"},"content":{"rendered":"\n<p>Phi\u00ean b\u1ea3n n\u00e2ng c\u1ea5p c\u1ee7a b\u00e0i vi\u1ebft n\u00e0y \u0111\u00e3 c\u00f3 \u1edf \u0111\u00e2y: <a href=\"https:\/\/kiencang.net\/php-dac-diem-ngay-thang-nam-sinh\/\" target=\"_blank\" rel=\"noreferrer noopener\">H\u00e0m PHP th\u00f4ng b\u00e1o \u0111\u1eb7c \u0111i\u1ec3m d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng sinh \u0111\u1ea7u v\u00e0o v\u1edbi l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn (v1.2)<\/a>.<\/p>\n\n\n\n<p>Trong b\u00e0i vi\u1ebft tr\u01b0\u1edbc t\u00f4i c\u00f3 l\u1ea3m nh\u1ea3m v\u1ec1 chuy\u1ec7n vi\u1ebft m\u00e3 qu\u00e1 c\u1ea9n th\u1eadn d\u1eabn \u0111\u1ebfn vi\u1ec7c x\u1eed l\u00fd ch\u1eadm d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng. Tuy nhi\u00ean khi nh\u00ecn l\u1ea1i \u0111\u1ed1ng d\u1eef li\u1ec7u hi\u1ec7n c\u00f3 th\u00ec qu\u1ea3 l\u00e0 vi\u1ec7c s\u1eed d\u1ee5ng m\u00e3 t\u1ed5ng qu\u00e1t r\u1ea5t quan tr\u1ecdng. \u00cdt nh\u1ea5t c\u0169ng trong giai \u0111o\u1ea1n ph\u00e2n t\u00edch d\u1eef li\u1ec7u ban \u0111\u1ea7u \u0111\u1ec3 \u0111\u1ec1 ra ph\u01b0\u01a1ng h\u01b0\u1edbng gi\u1ea3i quy\u1ebft chu\u1ea9n x\u00e1c. V\u00ec khi d\u1eef li\u1ec7u c\u00e0ng l\u1edbn, vi\u1ec7c c\u00f3 nhi\u1ec1u \u0111\u1ecbnh d\u1ea1ng d\u1eef li\u1ec7u kh\u00e1c nhau c\u00e0ng nhi\u1ec1u. V\u00e0 vi\u1ec7c c\u1ee9 th\u1ea5p th\u1ecfm d\u1eef li\u1ec7u sai th\u1eadt l\u00e0 kh\u00f3 ch\u1ecbu!<\/p>\n\n\n\n<p>B\u00e0i to\u00e1n m\u00e0 t\u00f4i mu\u1ed1n gi\u1ea3i quy\u1ebft ng\u00e0y h\u00f4m nay l\u00e0, v\u1edbi m\u1ed9t d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m b\u1ea5t k\u1ef3 cho tr\u01b0\u1edbc, c\u1ea7n ph\u00e2n t\u00edch \u0111\u01b0\u1ee3c d\u1eef li\u1ec7u \u0111\u00f3 c\u00f3 bao nhi\u00eau h\u00e0ng l\u00e0:<\/p>\n\n\n\n<ul><li>D\u1eef li\u1ec7u tr\u1ed1ng;<\/li><li>Thi\u1ebfu d\u1eef li\u1ec7u kh\u00f4ng th\u1ec3 kh\u00f4i ph\u1ee5c (ch\u1ec9 c\u00f3 nhi\u1ec1u nh\u1ea5t l\u00e0 2 trong ba d\u1eef li\u1ec7u, tr\u01b0\u1eddng h\u1ee3p thi\u1ebfu n\u00e0y kh\u00f4ng th\u1ec3 kh\u00f4i ph\u1ee5c \u0111\u01b0\u1ee3c);<\/li><li>D\u1eef li\u1ec7u sai logic, v\u00ed d\u1ee5 n\u0103m sinh 1700 cho ng\u01b0\u1eddi s\u1ed1ng, v\u00e0 n\u0103m sinh 2100 cho t\u01b0\u01a1ng lai c\u00f2n ch\u01b0a t\u1edbi;<\/li><li>Trong t\u1eadp d\u1eef li\u1ec7u c\u00f3 nh\u1eefng ki\u1ec3u d\u1eef li\u1ec7u n\u00e0o, s\u1ed1 l\u01b0\u1ee3ng bao nhi\u00eau: V\u00ed d\u1ee5 bao nhi\u00eau d\u1eef li\u1ec7u l\u00e0 n\u0103m \u0111\u1ee9ng tr\u01b0\u1edbc (kh\u00f4ng \u0111i\u1ec3n h\u00ecnh v\u1edbi ki\u1ec3u d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m c\u1ee7a VN), bao nhi\u00eau l\u00e0 th\u00e1ng \u0111\u1ee9ng tr\u01b0\u1edbc (kh\u00f4ng \u0111i\u1ec3n h\u00ecnh v\u1edbi ki\u1ec3u d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m c\u1ee7a VN), bao nhi\u00eau d\u1eef li\u1ec7u tu\u00e2n th\u1ee7 c\u1ea5u tr\u00fac ti\u00eau chu\u1ea9n \u1edf VN (theo th\u1ee9 t\u1ef1 ng\u00e0y, th\u00e1ng r\u1ed3i n\u0103m);<\/li><\/ul>\n\n\n\n<p>C\u00e1i n\u00e0y n\u00ean vi\u1ebft th\u00e0nh h\u00e0m <code>function<\/code>, v\u1edbi bi\u1ebfn \u0111\u1ea7u v\u00e0o l\u00e0 t\u00ean b\u1ea3ng d\u1eef li\u1ec7u c\u00f3 ch\u1ee9a c\u1ed9t ng\u00e0y th\u00e1ng n\u0103m sinh v\u00e0 t\u00ean c\u1ee7a c\u1ed9t ng\u00e0y th\u00e1ng, v\u00ed d\u1ee5 <code>($ten_bang,$ngay)<\/code>. Vi\u1ec7c n\u00e0y s\u1ebd gi\u00fap ch\u00fang ta nhanh ch\u00f3ng ki\u1ec3m tra m\u1ed9t b\u1ea3ng d\u1eef li\u1ec7u b\u1ea5t k\u1ef3 thay v\u00ec li\u00ean t\u1ee5c ph\u1ea3i s\u1eeda m\u00e3.<\/p>\n\n\n\n<p>\u0110o\u1ea1n m\u00e3 ban \u0111\u1ea7u th\u1ef1c hi\u1ec7n v\u1edbi l\u1ea5y t\u00ean b\u1ea3ng v\u00e0 k\u1ebft n\u1ed1i csdl:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function kiem_tra_ngaythang($ten_bang,$ngay){ \/\/t\u00ean b\u1ea3ng v\u00e0 t\u00ean c\u1ed9t l\u00e0 bi\u1ebfn \u0111\u1ea7u v\u00e0o\nrequire 'database.php'; \/\/ k\u1ebft n\u1ed1i csdl\n$query3=\"SELECT ngay FROM $ten_bang\";\n$result3=$db-&gt;query($query3);\n\nforeach ($result3 as $value3) {\n        $ntn_goc=$value3&#91;'$ngay']; \/\/ \u0111\u00e2y l\u00e0 th\u00f4ng tin ng\u00e0y th\u00e1ng n\u0103m g\u1ed1c l\u1ea5y t\u1eeb b\u1ea3ng\n}<\/code><\/pre>\n\n\n\n<p>Ti\u1ebfp theo ch\u00fang ta s\u1ebd ti\u1ebfn h\u00e0nh c\u1eaft b\u1ecf kho\u1ea3ng tr\u1eafng tr\u00e1i v\u00e0 ph\u1ea3i c\u1ee7a d\u1eef li\u1ec7u :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$ngaya= trim($ntn_goc, ' '); \/\/ lo\u1ea1i b\u1ecf kho\u1ea3ng tr\u1eafng tr\u01b0\u1edbc v\u00e0 sau chu\u1ed7i ng\u00e0y th\u00e1ng n\u0103m sinh<\/code><\/pre>\n\n\n\n<p>T\u1ea1o bi\u1ebfn \u0111\u1ebfm d\u1eef li\u1ec7u r\u1ed7ng ho\u1eb7c <code>NULL<\/code>, r\u1ed3i d\u00f9ng h\u00e0m <code>if<\/code> \u0111\u1ec3 ki\u1ec3m tra:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$kdl=0; \/\/l\u01b0u \u00fd c\u00e1c bi\u1ebfn nh\u01b0 d\u1ea1ng $kdl c\u1ea7n \u0111\u1eb7t ngo\u00e0i v\u00f2ng l\u1eb7p foreach\n\/\/b\u00e2y gi\u1edd b\u1ea1n c\u1ee9 quan s\u00e1t \u0111\u1ec3 hi\u1ec3u, m\u00e3 t\u1ed5ng th\u1ec3 c\u00f3 \u1edf cu\u1ed1i b\u00e0i\nif ($ngaya==NULL || $ngaya == \"\") {$kdl++;}<\/code><\/pre>\n\n\n\n<p>D\u00f9 hi\u1ebfm g\u1eb7p, thi tho\u1ea3ng d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m sinh c\u0169ng c\u00f3 kho\u1ea3ng tr\u1eafng b\u00ean trong chu\u1ed7i, v\u00ed d\u1ee5 <code>5\/ 7\/2015<\/code>. Ch\u00fang ta c\u0169ng n\u00ean ki\u1ec3m tra xem s\u1ed1 l\u01b0\u1ee3ng d\u1eef li\u1ec7u nh\u01b0 v\u1eady c\u00f3 nhi\u1ec1u hay kh\u00f4ng. PHP c\u00f3 c\u00e2u l\u1ec7nh \u0111\u1ec3 l\u00e0m vi\u1ec7c n\u00e0y r\u1ea5t nhanh g\u1ecdn, n\u00f3 c\u00f3 t\u00ean l\u00e0 <code>substr_count($text, ' ')<\/code>. <\/p>\n\n\n\n<p>V\u00ec ch\u00fang ta \u0111\u00e3 kh\u1eed kho\u1ea3ng tr\u1eafng \u1edf 2 b\u00ean, n\u00ean n\u1ebfu gi\u00e1 tr\u1ecb kho\u1ea3ng tr\u1eafng c\u1ee7a chu\u1ed7i l\u1edbn h\u01a1n 0, th\u00ec c\u00f3 ngh\u0129a l\u00e0 c\u00f3 kho\u1ea3ng tr\u1eafng n\u1eb1m trong chu\u1ed7i. Ch\u00fang ta c\u0169ng n\u00ean t\u1ea1o m\u1ed9t m\u1ea3ng \u0111\u1ec3 l\u01b0u c\u00e1c gi\u00e1 tr\u1ecb \u0111\u00f3 \u0111\u1ec3 in ra, t\u00ecm th\u1ee7 c\u00f4ng d\u1eef li\u1ec7u l\u1ed7i trong d\u1eef li\u1ec7u l\u1edbn r\u1ea5t kh\u00f3 kh\u0103n, n\u1ebfu ch\u00fang ta c\u00f3 th\u00f4ng tin d\u1eef li\u1ec7u l\u1ed7i nh\u01b0 th\u1ebf n\u00e0o th\u00ec vi\u1ec7c t\u00ecm n\u00f3 trong b\u1ea3ng d\u1eef li\u1ec7u r\u1ea5t d\u1ec5 d\u00e0ng.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$ktrang=array(); $j=0;\n$cokt=substr_count($ngaya, ' ');\n\nif ($cokt) {$ktrang&#91;$j]=$ngaya; $j++;}\n\/\/ thay v\u00ec vi\u1ebft $cokt &gt; 0 ch\u00fang ta c\u00f3 th\u1ec3 vi\u1ebft ng\u1eafn g\u1ecdn nh\u01b0 tr\u00ean\n\/\/ thay v\u00ec vi\u1ebft $j=$j+1; ch\u00fang ta vi\u1ebft $j++ c\u0169ng cho k\u1ebft qu\u1ea3 t\u01b0\u01a1ng t\u1ef1<\/code><\/pre>\n\n\n\n<p>Ti\u1ebfp theo ch\u00fang ta s\u1ebd xem c\u00f3 b\u1ea5t k\u1ef3 k\u00fd t\u1ef1 n\u00e0o qu\u00e1i l\u1ea1 trong ng\u00e0y th\u00e1ng hay kh\u00f4ng ho\u1eb7c n\u00f3 b\u1ecb thi\u1ebfu d\u1eef li\u1ec7u kh\u00f4ng th\u1ec3 kh\u00f4i ph\u1ee5c kh\u00f4ng (ch\u1ec9 c\u00f3 2 trong 3 d\u1eef li\u1ec7u). K\u00fd t\u1ef1 ti\u00eau chu\u1ea9n trong ng\u00e0y th\u00e1ng ch\u1ec9 bao g\u1ed3m:<\/p>\n\n\n\n<ul><li>D\u1ea5u g\u1ea1ch xu\u00f4i \/<\/li><li>D\u1ea5u g\u1ea1ch ngang <code>-<\/code><\/li><li>D\u1ea5u ch\u1ea5m <code>.<\/code> (\u00edt g\u1eb7p h\u01a1n \u0111\u00e1ng k\u1ec3 so v\u1edbi hai d\u1ea5u tr\u00ean);<\/li><li>V\u00e0 c\u00e1c con s\u1ed1 ch\u1eafc ch\u1eafn ph\u1ea3i c\u00f3 (0,1,2,..,9);<\/li><\/ul>\n\n\n\n<p>Ch\u00fang ta s\u1ebd <a href=\"https:\/\/kiencang.net\/cu-phap-co-ban-regex\/\" target=\"_blank\" rel=\"noreferrer noopener\">s\u1eed d\u1ee5ng RegEx<\/a> \u0111\u1ec3 l\u00e0m m\u1eabu d\u1eef li\u1ec7u, n\u00f3 s\u1ebd nh\u01b0 th\u1ebf n\u00e0y:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>^(\\d{1,4})(&#91;\\\/\\-\\.]\\d{1,4}){2}$<\/code><\/pre>\n\n\n\n<p>\u0110\u00e2y l\u00e0 m\u1eabu RegEx \u0111\u01a1n gi\u1ea3n, v\u00ec ch\u00fang ta ch\u1ec9 mu\u1ed1n l\u1ecdc d\u1eef li\u1ec7u c\u00f3 k\u00fd t\u1ef1 l\u1ea1 (kh\u00f4ng bao g\u1ed3m s\u1ed1 v\u00e0 d\u1ea5u ph\u00e2n c\u00e1ch \/ ho\u1eb7c &#8211; ho\u1eb7c .)<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$laloi=array();$ll=0;\n\n$reg_laloi='\/^(\\d{1,4})(&#91;\\\/\\-\\.]\\d{1,4}){2}$\/';\n\n\/\/ b\u1ea1n ch\u00fa \u00fd c\u00e1ch \u0111\u1eb7t l\u1ec7nh regex trong PHP, n\u00f3 th\u01b0\u1eddng n\u1eb1m trong d\u1ea5u '\/\/'\n\n$kq_laloi=preg_match($reg_laloi, $ngaya);\n\n\/\/ n\u1ebfu kh\u1edbp k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 1, n\u1ebfu kh\u00f4ng kh\u1edbp k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 0\n\nif ($kq_laloi==0) {$laloi&#91;$ll]=$ngaya;$ll++;} \/\/ n\u1ebfu ng\u00e0y th\u00e1ng n\u0103m c\u00f3 k\u00fd t\u1ef1 l\u1ea1 ho\u1eb7c thi\u1ebfu d\u1eef li\u1ec7u th\u00ec n\u00f3 \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o m\u1ea3ng $laloi \u0111\u1ec3 show ra sau n\u00e0y<\/code><\/pre>\n\n\n\n<p>V\u1eady l\u00e0 \u0111\u1ebfn b\u01b0\u1edbc n\u00e0y ch\u00fang ta \u0111\u00e3 l\u00e0m \u0111\u01b0\u1ee3c m\u1ea5y vi\u1ec7c quan tr\u1ecdng:<\/p>\n\n\n\n<ul><li>Ph\u00e1t hi\u1ec7n d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m c\u00f3 kho\u1ea3ng tr\u1eafng n\u1eb1m trong;<\/li><li>Ph\u00e1t hi\u1ec7n d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m c\u00f3 k\u00fd t\u1ef1 kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p;<\/li><li>Ph\u00e1t hi\u1ec7n d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m thi\u1ebfu d\u1eef li\u1ec7u kh\u00f4ng th\u1ec3 kh\u00f4i ph\u1ee5c \u0111\u01b0\u1ee3c;<\/li><\/ul>\n\n\n\n<p>B\u00e2y gi\u1edd m\u1edbi \u0111\u1ebfn b\u01b0\u1edbc ch\u00fang ta x\u00e1c \u0111\u1ecbnh d\u1eef li\u1ec7u c\u00f3 c\u1ea5u tr\u00fac nh\u01b0 th\u1ebf n\u00e0o.<\/p>\n\n\n\n<p>Trong ph\u1ea7n n\u00e0y, ch\u00fang ta c\u0169ng s\u1ebd d\u00f9ng bi\u1ec3u th\u1ee9c ch\u00ednh quy (RegEx), nh\u01b0ng v\u1edbi c\u1ea5u tr\u00fac ch\u1eb7t ch\u1ebd h\u01a1n nhi\u1ec1u.<\/p>\n\n\n\n<p>Bi\u1ec3u th\u1ee9c ch\u00ednh quy \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u1ea5u tr\u00fac ng\u00e0y r\u1ed3i \u0111\u1ebfn th\u00e1ng, r\u1ed3i m\u1edbi \u0111\u1ebfn n\u0103m l\u00e0:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>^(0?&#91;1-9]|&#91;12]\\d|3&#91;01])&#91;\\\/\\-\\.](0?&#91;1-9]|1&#91;012])&#91;\\\/\\-\\.](\\d{2}|\\d{4})$<\/code><\/pre>\n\n\n\n<ul><li>Chu\u1ed7i s\u1ed1 \u0111\u1ea7u ti\u00ean s\u1ebd ch\u1ec9 n\u1eb1m trong kho\u1ea3ng t\u1eeb 01 \u0111\u1ebfn 31 (ho\u1eb7c 1, 2, 3,.., 9, kh\u00f4ng b\u1eaft bu\u1ed9c ph\u1ea3i c\u00f3 s\u1ed1 0 \u0111\u1eb1ng tr\u01b0\u1edbc v\u1edbi nh\u1eefng s\u1ed1 d\u01b0\u1edbi 10), chu\u1ed7i th\u1ee9 hai ch\u1ec9 n\u1eb1m trong trong t\u1eeb 01 (ho\u1eb7c 1, kh\u00f4ng b\u1eaft bu\u1ed9c ph\u1ea3i c\u00f3 s\u1ed1 0 \u0111\u1eb1ng tr\u01b0\u1edbc v\u1edbi nh\u1eefng s\u1ed1 d\u01b0\u1edbi 10) \u0111\u1ebfn 12. C\u00f2n cu\u1ed1i c\u00f9ng l\u00e0 n\u0103m v\u1edbi gi\u00e1 tr\u1ecb l\u00e0 2 s\u1ed1 (v\u00ed d\u1ee5 87 ho\u1eb7c 15) hay 4 s\u1ed1 (v\u00ed 1987 ho\u1eb7c 2015);<\/li><li>\u0110\u00e2y l\u00e0 c\u1ea5u tr\u00fac nhi\u1ec1u kh\u1ea3 n\u0103ng nh\u1ea5t s\u1ebd x\u1ea3y ra trong h\u1ea7u h\u1ebft tr\u01b0\u1eddng h\u1ee3p;<\/li><\/ul>\n\n\n\n<p>C\u00e2u l\u1ec7nh c\u1ee5 th\u1ec3 s\u1ebd nh\u01b0 sau:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$dem_ntnc=0; \/\/ d\u00f9ng \u0111\u1ec3 \u0111\u1ebfm xem c\u00f3 bao nhi\u00eau d\u1eef li\u1ec7u \u0111\u1ea1t chu\u1ea9n\n$reg_ntnc='\/^(0?&#91;1-9]|&#91;12]\\d|3&#91;01])&#91;\\\/\\-\\.](0?&#91;1-9]|1&#91;012])&#91;\\\/\\-\\.](\\d{2}|\\d{4})$\/';\n$kq_ntnc=preg_match($reg_ntnc, $ngaya);\nif ($kq_ntnc) {$dem_ntnc++;}<\/code><\/pre>\n\n\n\n<p>Gi\u00e1 tr\u1ecb <code>$dem_ntnc<\/code> s\u1ebd cho b\u1ea1n bi\u1ebft trong d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n c\u00f3 bao nhi\u00eau d\u1eef li\u1ec7u \u0111\u00fang chu\u1ea9n ng\u00e0y\/th\u00e1ng\/n\u0103m (d\u1ea5u \/ c\u00f3 th\u1ec3 l\u00e0 &#8211; ho\u1eb7c .)<\/p>\n\n\n\n<p>Chia con s\u1ed1 \u0111\u1ea5y cho h\u00e0ng d\u1eef li\u1ec7u, b\u1ea1n c\u00f3 th\u1ec3 \u01b0\u1edbc t\u00ednh \u0111\u01b0\u1ee3c t\u1ef7 l\u1ec7 th\u1ed1ng nh\u1ea5t d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n. N\u1ebfu d\u1eef li\u1ec7u thu th\u1eadp c\u00f3 ngu\u1ed3n \u0111\u1ee7 t\u1ed1t, con s\u1ed1 n\u00e0y th\u01b0\u1eddng l\u1edbn h\u01a1n 99%.<\/p>\n\n\n\n<p>\u0110o\u1ea1n m\u00e3 ho\u00e0n ch\u1ec9nh \u0111\u1ec3 ki\u1ec3m tra:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction kiem_tra_ngaythang_v2($ten_bang,$ngay){ \/\/ \u0111\u1ec3 ki\u1ec3m tra d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng \u0111ang c\u00f3 c\u1ea5u tr\u00fac nh\u01b0 th\u1ebf n\u00e0o?\nrequire 'database.php';\n$query3=\"SELECT ngay FROM $ten_bang\";\n$result3=$db-&gt;query($query3);\n\n$kdl=0;\/\/\u0111\u1ebfm d\u1eef li\u1ec7u NULL\n$ktrang=array(); $j=0; \/\/ \u0111\u1ebfm v\u00e0 l\u01b0u d\u1eef li\u1ec7u c\u00f3 kho\u1ea3ng tr\u1eafng \u1edf gi\u1eefa\n$laloi=array();$ll=0; \/\/ \u0111\u1ebfm v\u00e0 l\u01b0u d\u1eef li\u1ec7u l\u1ed7i\n$dem_ntnc=0; \/\/ \u0110\u1ebfm s\u1ed1 d\u1eef li\u1ec7u \u0111\u1ea1t ti\u00eau chu\u1ea9n ng\u00e0y\/th\u00e1ng\/n\u0103m\n$dem_tnnc=0; \/\/ \u0110\u1ebfm s\u1ed1 d\u1eef li\u1ec7u \u0111\u1ea1t ti\u00eau chu\u1ea9n th\u00e1ng\/ng\u00e0y\/n\u0103m\n$tong_ban_ghi=0;\/\/T\u1ed5ng s\u1ed1 h\u00e0ng d\u1eef li\u1ec7u\n  foreach ($result3 as $value3) {\n        $tong_ban_ghi++;\n        $ntn_goc=$value3&#91;$ngay]; \/\/ \u0111\u00e2y l\u00e0 th\u00f4ng tin ng\u00e0y th\u00e1ng n\u0103m g\u1ed1c l\u1ea5y t\u1eeb b\u1ea3ng\n        $ngaya= trim($ntn_goc, ' '); \/\/ lo\u1ea1i b\u1ecf kho\u1ea3ng tr\u1eafng tr\u01b0\u1edbc v\u00e0 sau chu\u1ed7i ng\u00e0y th\u00e1ng n\u0103m sinh\n        \n        if ($ngaya==NULL || $ngaya == \"\") {$kdl++;} else {\n                \n               $cokt=substr_count($ngaya, ' ');\n               if ($cokt) {$ktrang&#91;$j]=$ngaya; $j++;} else {\n        \n                       $reg_laloi='\/^(\\d{1,4})(&#91;\\\/\\-\\.]\\d{1,4}){2}$\/';\n                       $kq_laloi=preg_match($reg_laloi, $ngaya);\n                       \n                       \/\/ n\u1ebfu ng\u00e0y th\u00e1ng n\u0103m c\u00f3 k\u00fd t\u1ef1 l\u1ea1 ho\u1eb7c thi\u1ebfu d\u1eef li\u1ec7u th\u00ec n\u00f3 \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o m\u1ea3ng $laloi \u0111\u1ec3 show ra sau n\u00e0y\n                       if ($kq_laloi==0) {$laloi&#91;$ll]=$ngaya;$ll++;}\n                        \n                }\n                 \n        }\n          \/\/ ki\u1ec3m tra kh\u1edbp v\u1edbi ki\u1ec3u d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m\n          $reg_ntnc='\/^(0?&#91;1-9]|&#91;12]\\d|3&#91;01])&#91;\\\/\\-\\.](0?&#91;1-9]|1&#91;012])&#91;\\\/\\-\\.](\\d{2}|\\d{4})$\/';\n          $kq_ntnc=preg_match($reg_ntnc, $ngaya);\n          if ($kq_ntnc) {$dem_ntnc++;}\n          \n          \/\/ ki\u1ec3m tra kh\u1edbp v\u1edbi ki\u1ec3u d\u1eef li\u1ec7u th\u00e1ng ng\u00e0y n\u0103m\n          $reg_tnnc='\/^(0?&#91;1-9]|1&#91;012])&#91;\\\/\\-\\.](0?&#91;1-9]|&#91;12]\\d|3&#91;01])&#91;\\\/\\-\\.](\\d{2}|\\d{4})$\/';\n          $kq_tnnc=preg_match($reg_tnnc, $ngaya);\n          if ($kq_tnnc) {$dem_tnnc++;}\n    } \n\n$kq_ktrang=\"\";  \n$sl_ktrang=count($ktrang);\nif($sl_ktrang&gt;0) {foreach ($ktrang as $ch_ktrang) {$kq_ktrang=$kq_ktrang.$ch_ktrang.\"&lt;\/br&gt;\";}}\n\n$in_laloi=\"\";\n$sl_laloi=count($laloi);\nif($sl_laloi&gt;0) {foreach ($laloi as $ch_laloi) {$in_laloi=$in_laloi.$ch_laloi.\"&lt;\/br&gt;\";}}\n\n$tyle=($dem_ntnc\/$tong_ban_ghi)*100;\n$kq_tyle=$tyle.'%';\n$tong_dll=$tong_ban_ghi-$dem_ntnc; \/\/ t\u1ed5ng d\u1eef li\u1ec7u l\u1ed7i\n\n$giadinh=($dem_tnnc\/$tong_ban_ghi)*100;\n$kq_giadinh=$giadinh.'%';\n\n$kq1=\"S\u1ed1 l\u01b0\u1ee3ng d\u1eef li\u1ec7u NULL ho\u1eb7c R\u1ed6NG: \".$kdl.\"&lt;\/br&gt;\";\n$kq2=\"S\u1ed1 l\u01b0\u1ee3ng d\u1eef li\u1ec7u c\u00f3 kho\u1ea3ng tr\u1eafng trong ng\u00e0y th\u00e1ng (hi\u1ebfm g\u1eb7p): \".$sl_ktrang.\"&lt;\/br&gt;\".\"C\u00e1c m\u1eabu (n\u1ebfu c\u00f3): \".\"&lt;\/br&gt;\".$kq_ktrang.\"&lt;\/br&gt;\".\"&lt;\/br&gt;\";\n$kq3=\"S\u1ed1 l\u01b0\u1ee3ng d\u1eef li\u1ec7u c\u00f3 k\u00fd t\u1ef1 l\u1ea1 ho\u1eb7c thi\u1ebfu d\u1eef li\u1ec7u kh\u00f4ng kh\u00f4i ph\u1ee5c \u0111\u01b0\u1ee3c: \".$sl_laloi.\"&lt;\/br&gt;\".\"C\u00e1c m\u1eabu (n\u1ebfu c\u00f3): \".\"&lt;\/br&gt;\".$in_laloi.\"&lt;\/br&gt;\".\"&lt;\/br&gt;\";\n$kq4=\"T\u1ef7 l\u1ec7 d\u1eef li\u1ec7u c\u00f3 c\u1ea5u tr\u00fac ng\u00e0y\/th\u00e1ng\/n\u0103m ti\u00eau chu\u1ea9n: \".$kq_tyle.\"&lt;\/br&gt;\";\n$kq5=\"T\u1ed5ng s\u1ed1 d\u1eef li\u1ec7u kh\u00e1c c\u1ea5u tr\u00fac ti\u00eau chu\u1ea9n l\u00e0: \".$tong_dll.\"&lt;\/br&gt;\";\n$kq6=\"Gi\u1ea3 \u0111\u1ecbnh d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n l\u00e0 th\u00e1ng\/ng\u00e0y\/n\u0103m th\u00ec t\u1ec9 l\u1ec7 s\u1ebd l\u00e0: \".$kq_giadinh.\"&lt;\/br&gt;\";\n\/\/ ng\u00e0y th\u00e1ng n\u0103m ti\u00eau chu\u1ea9n l\u00e0 c\u00f3 c\u1ea5u tr\u00fac ng\u00e0y tr\u01b0\u1edbc th\u00e1ng r\u1ed3i cu\u1ed1i l\u00e0 n\u0103m, d\u1ea5u ph\u00e2n c\u00e1ch c\u00f3 th\u1ec3 l\u00e0\n\/\/ d\u1ea5u g\u1ea1ch xu\u00f4i \/ ho\u1eb7c d\u1ea5u g\u1ea1ch ngang - ho\u1eb7c d\u1ea5u .\n\/\/ ng\u00e0y c\u00f3 th\u1ec3 l\u00e0 1 s\u1ed1 ho\u1eb7c 2 s\u1ed1, c\u00f3 th\u1ec3 c\u00f3 s\u1ed1 0 \u0111\u1eb1ng tr\u01b0\u1edbc n\u1ebfu d\u01b0\u1edbi 10, ng\u00e0y n\u1eb1m trong kho\u1ea3ng t\u1eeb 1 \u0111\u1ebfn 31\n\/\/ th\u00e1ng c\u00f3 th\u1ec3 l\u00e0 1 s\u1ed1 ho\u1eb7c 2 s\u1ed1, c\u00f3 th\u1ec3 c\u00f3 s\u1ed1 0 \u0111\u1eb1ng tr\u01b0\u1edbc n\u1ebfu d\u01b0\u1edbi 10, th\u00e1ng ch\u1ec9 n\u1eb1m trong kho\u1ea3ng t\u1eeb 1 \u0111\u1ebfn 12\n\/\/ n\u0103m c\u00f3 th\u1ec3 l\u00e0 s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1 ho\u1eb7c 4 ch\u1eef s\u1ed1\n\/\/ d\u00f9 d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n l\u00e0 ng\u00e0y\/th\u00e1ng\/n\u0103m chu\u1ea9n th\u00ec nh\u1eefng ng\u00e0y nh\u01b0 05\/07\/2015 th\u00ec gi\u1ea3 \u0111\u1ecbnh th\u00e1ng \u0111\u1ee9ng tr\u01b0\u1edbc v\u1eabn h\u1ee3p l\u1ec7 theo c\u00e1ch ki\u1ec3m tra\n\/\/ do v\u1eady th\u1ef1c t\u1ebf d\u1eef li\u1ec7u r\u1ea5t quan tr\u1ecdng, th\u01b0\u1eddng nh\u1eefng d\u1eef li\u1ec7u l\u1ea5y t\u1eeb c\u00f9ng m\u1ed9t ngu\u1ed3n s\u1ebd c\u00f3 c\u1ea5u tr\u00fac gi\u1ed1ng nhau\n$kq=$kq1.$kq2.$kq3.$kq4.$kq5.$kq6;\nreturn $kq;\n}\necho kiem_tra_ngaythang_v2(\"ten_bang_du_lieu\",\"ten_cot_ngay\");\n\/\/ b\u1ea1n thay th\u1ebf ten_bang_du_lieu b\u00e0ng t\u00ean b\u1ea3ng d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n (kh\u00f4ng ph\u1ea3i t\u00ean database)\n\/\/ b\u1ea1n thay th\u1ebf ten_cot_ngay b\u1eb1ng t\u00ean c\u1ee7a c\u1ed9t ng\u00e0y th\u00e1ng trong b\u1ea3ng d\u1eef li\u1ec7u m\u00e0 b\u1ea1n c\u1ea7n ki\u1ec3m tra\n\n<\/code><\/pre>\n\n\n\n<p>V\u00ed d\u1ee5 v\u1ec1 m\u1ed9t k\u1ebft qu\u1ea3 m\u00e0 t\u00f4i ki\u1ec3m tra v\u1edbi g\u1ea7n 40 ng\u00e0n h\u00e0ng d\u1eef li\u1ec7u:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/08\/ket-qua-thong-ke-ngay-thang.png\" alt=\"\" class=\"wp-image-13938\"\/><\/figure><\/div>\n\n\n\n<p>N\u1ebfu d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o t\u1ed1t, h\u1ea7u nh\u01b0 b\u1ea1n ch\u1ec9 g\u1eb7p l\u1ed7i d\u1eef li\u1ec7u NULL, r\u1ed7ng ch\u1ee9 \u00edt khi g\u1eb7p c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 k\u00fd t\u1ef1 l\u1ea1 ho\u1eb7c c\u00f3 c\u00e1ch tr\u1eafng \u1edf trong t\u00ean.<\/p>\n\n\n\n<p>PS: ngo\u00e0i ra b\u1ea1n c\u00f3 th\u1ec3 d\u00f9ng h\u00e0m sau \u0111\u1ec3 xu\u1ea5t \u0111\u1ea7y \u0111\u1ee7 d\u1eef li\u1ec7u kh\u00f4ng h\u1ee3p chu\u1ea9n ng\u00e0y th\u00e1ng n\u0103m nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00e0 R\u1ed6NG ho\u1eb7c NULL.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction ngay_thang_ktc($ten_bang,$ngay){ \/\/ \u0111\u1ec3 ki\u1ec3m tra d\u1eef li\u1ec7u kh\u00f4ng ph\u1ea3i ti\u00eau chu\u1ea9n ng\u00e0y\/th\u00e1ng\/n\u0103m\nrequire 'database.php';\n$query4=\"SELECT ngay FROM $ten_bang\";\n$result4=$db-&gt;query($query4);\n\n$none_dem_ntnc=array();$j=0; \/\/ \u0110\u1ebfm s\u1ed1 d\u1eef li\u1ec7u kh\u00f4ng ph\u1ea3i chu\u1ea9n ng\u00e0y th\u00e1ng n\u0103m\n  foreach ($result4 as $value4) {\n        $ntn_goc=$value4&#91;$ngay]; \/\/ \u0111\u00e2y l\u00e0 th\u00f4ng tin ng\u00e0y th\u00e1ng n\u0103m g\u1ed1c l\u1ea5y t\u1eeb b\u1ea3ng\n        $ngaya= trim($ntn_goc, ' '); \/\/ lo\u1ea1i b\u1ecf kho\u1ea3ng tr\u1eafng tr\u01b0\u1edbc v\u00e0 sau chu\u1ed7i ng\u00e0y th\u00e1ng n\u0103m sinh\n        \n        if ($ngaya!=NULL || $ngaya != \"\") {\n          \/\/ ki\u1ec3m tra kh\u1edbp v\u1edbi ki\u1ec3u d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m\n          $reg_ntnc='\/^(0?&#91;1-9]|&#91;12]\\d|3&#91;01])&#91;\\\/\\-\\.](0?&#91;1-9]|1&#91;012])&#91;\\\/\\-\\.](\\d{2}|\\d{4})$\/';\n          $kq_ntnc=preg_match($reg_ntnc, $ngaya);\n          if ($kq_ntnc==0) {$none_dem_ntnc&#91;$j]=$ngaya;$j++;} \/\/b\u1eb1ng 0 ngh\u0129a l\u00e0 kh\u00f4ng kh\u1edbp\n        }     \n  } \n\n$kq_none_ntn=\"\";  \n$sl_none_ntn=count($none_dem_ntnc);\nif($sl_none_ntn&gt;0) {foreach ($none_dem_ntnc as $ch_none_dem_ntnc) {$kq_none_ntn=$kq_none_ntn.$ch_none_dem_ntnc.\"&lt;\/br&gt;\";}}\n\n$kq=\"C\u00e1c d\u1eef li\u1ec7u h\u1ec7 th\u1ed1ng ghi nh\u1eadn kh\u00e1c ti\u00eau chu\u1ea9n ng\u00e0y\/th\u00e1ng\/n\u0103m nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00e0 R\u1ed6NG ho\u1eb7c NULL: \".\"&lt;\/br&gt;\".$kq_none_ntn.\"&lt;\/br&gt;\";\nreturn $kq;\n}<\/code><\/pre>\n\n\n\n<p>V\u00ed d\u1ee5 t\u1eeb m\u1ed9t b\u1ea3ng c\u1ee7a t\u00f4i:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"691\" height=\"499\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/08\/khac-chuan-ngay-thang-nam.png\" alt=\"Xu\u1ea5t d\u1eef li\u1ec7u kh\u00f4ng ph\u1ea3i chu\u1ea9n ng\u00e0y\/th\u00e1ng\/n\u0103m\" class=\"wp-image-13959\" srcset=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/08\/khac-chuan-ngay-thang-nam.png 691w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/08\/khac-chuan-ngay-thang-nam-300x217.png 300w\" sizes=\"(max-width: 691px) 100vw, 691px\" \/><\/figure><\/div>\n\n\n\n<p>Xin ch\u00e0o v\u00e0 h\u1eb9n g\u1eb7p l\u1ea1i c\u00e1c b\u1ea1n trong b\u00e0i vi\u1ebft sau khi t\u00f4i s\u1ebd x\u1eed l\u00fd t\u1ed5ng qu\u00e1t h\u01a1n tr\u01b0\u1eddng gi\u1edbi t\u00ednh.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Phi\u00ean b\u1ea3n n\u00e2ng c\u1ea5p c\u1ee7a b\u00e0i vi\u1ebft n\u00e0y \u0111\u00e3 c\u00f3 \u1edf \u0111\u00e2y: H\u00e0m PHP th\u00f4ng b\u00e1o \u0111\u1eb7c \u0111i\u1ec3m d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng sinh \u0111\u1ea7u v\u00e0o v\u1edbi l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn (v1.2). Trong b\u00e0i vi\u1ebft tr\u01b0\u1edbc t\u00f4i c\u00f3 l\u1ea3m nh\u1ea3m v\u1ec1 chuy\u1ec7n vi\u1ebft m\u00e3 qu\u00e1 c\u1ea9n th\u1eadn d\u1eabn \u0111\u1ebfn vi\u1ec7c x\u1eed l\u00fd ch\u1eadm d\u1eef li\u1ec7u ng\u00e0y &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[238],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>B\u00e0i to\u00e1n ph\u00e2n t\u00edch d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m sinh \u0111\u1ec3 b\u00e1o c\u00e1o s\u01a1 b\u1ed9 c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u hi\u1ec7n c\u00f3 &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/phan-tich-du-lieu-ngay-thang-nam\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"B\u00e0i to\u00e1n ph\u00e2n t\u00edch d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m sinh \u0111\u1ec3 b\u00e1o c\u00e1o s\u01a1 b\u1ed9 c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u hi\u1ec7n c\u00f3 &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"Phi\u00ean b\u1ea3n n\u00e2ng c\u1ea5p c\u1ee7a b\u00e0i vi\u1ebft n\u00e0y \u0111\u00e3 c\u00f3 \u1edf \u0111\u00e2y: H\u00e0m PHP th\u00f4ng b\u00e1o \u0111\u1eb7c \u0111i\u1ec3m d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng sinh \u0111\u1ea7u v\u00e0o v\u1edbi l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn (v1.2). 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