{"id":12395,"date":"2021-09-23T04:56:00","date_gmt":"2021-09-23T04:56:00","guid":{"rendered":"https:\/\/kiencang.net\/2015\/01\/23\/ham-trong-php\/"},"modified":"2021-09-23T04:56:00","modified_gmt":"2021-09-23T04:56:00","slug":"ham-trong-php","status":"publish","type":"post","link":"https:\/\/kiencang.net\/ham-trong-php\/","title":{"rendered":"H\u00e0m (function) trong PHP"},"content":{"rendered":"\n<p>S\u1ee9c m\u1ea1nh th\u1ef1c s\u1ef1 c\u1ee7a PHP \u0111\u1ebfn t\u1eeb c\u00e1c h\u00e0m; n\u00f3 c\u00f3 h\u01a1n 1000 h\u00e0m x\u00e2y d\u1ef1ng s\u1eb5n cho b\u1ea1n s\u1eed d\u1ee5ng.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-6577d6519ca72\" ><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d6519ca72\"  type=\"checkbox\" id=\"item-6577d6519ca72\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kiencang.net\/ham-trong-php\/#Nguoi_dung_tu_dinh_nghia_ham\" title=\"Ng\u01b0\u1eddi d\u00f9ng t\u1ef1 \u0111\u1ecbnh ngh\u0129a h\u00e0m\">Ng\u01b0\u1eddi d\u00f9ng t\u1ef1 \u0111\u1ecbnh ngh\u0129a h\u00e0m<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/ham-trong-php\/#Cach_tao_mot_ham_do_nguoi_dung_tu_dinh_nghia\" title=\"C\u00e1ch t\u1ea1o m\u1ed9t h\u00e0m do ng\u01b0\u1eddi d\u00f9ng t\u1ef1 \u0111\u1ecbnh ngh\u0129a\">C\u00e1ch t\u1ea1o m\u1ed9t h\u00e0m do ng\u01b0\u1eddi d\u00f9ng t\u1ef1 \u0111\u1ecbnh ngh\u0129a<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kiencang.net\/ham-trong-php\/#Tao_cac_ham_co_doi_so\" title=\"T\u1ea1o c\u00e1c h\u00e0m c\u00f3 \u0111\u1ed1i s\u1ed1\">T\u1ea1o c\u00e1c h\u00e0m c\u00f3 \u0111\u1ed1i s\u1ed1<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/ham-trong-php\/#Doi_so_mac_dinh_trong_PHP\" title=\"\u0110\u1ed1i s\u1ed1 m\u1eb7c \u0111\u1ecbnh trong PHP\">\u0110\u1ed1i s\u1ed1 m\u1eb7c \u0111\u1ecbnh trong PHP<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kiencang.net\/ham-trong-php\/#Ham_PHP_%E2%80%93_tra_ve_gia_tri_cu_the\" title=\"H\u00e0m PHP \u2013 tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb c\u1ee5 th\u1ec3\">H\u00e0m PHP \u2013 tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb c\u1ee5 th\u1ec3<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/kiencang.net\/ham-trong-php\/#PHP_la_ngon_ngu_kha_long\" title=\"PHP l\u00e0 ng\u00f4n ng\u1eef kh\u00e1 l\u1ecfng\">PHP l\u00e0 ng\u00f4n ng\u1eef kh\u00e1 l\u1ecfng<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Nguoi_dung_tu_dinh_nghia_ham\"><\/span>Ng\u01b0\u1eddi d\u00f9ng t\u1ef1 \u0111\u1ecbnh ngh\u0129a h\u00e0m<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>B\u00ean c\u1ea1nh c\u00e1c h\u00e0m x\u00e2y d\u1ef1ng s\u1eb5n, ch\u00fang ta c\u00f3 th\u1ec3 t\u1ef1 t\u1ea1o c\u00e1c h\u00e0m d\u00f9ng cho ri\u00eang m\u00ecnh.<\/p>\n\n\n\n<ul><li>H\u00e0m l\u00e0 kh\u1ed1i l\u1ec7nh c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng nhi\u1ec1u l\u1ea7n trong ch\u01b0\u01a1ng tr\u00ecnh (gi\u00fap b\u1ea1n ti\u1ebft ki\u1ec7m th\u1eddi gian g\u00f5 code c\u0169ng nh\u01b0 ch\u1ec9nh s\u1eeda, qu\u1ea3n l\u00fd l\u1ed7i).<\/li><li>H\u00e0m kh\u00f4ng \u0111\u01b0\u1ee3c th\u1ef1c thi ngay l\u1eadp t\u1ee9c khi trang \u0111\u01b0\u1ee3c t\u1ea3i v\u1ec1.<\/li><li>H\u00e0m ch\u1ec9 \u0111\u01b0\u1ee3c th\u1ef1c thi b\u1eb1ng l\u1eddi g\u1ecdi h\u00e0m.<\/li><\/ul>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cach_tao_mot_ham_do_nguoi_dung_tu_dinh_nghia\"><\/span>C\u00e1ch t\u1ea1o m\u1ed9t h\u00e0m do ng\u01b0\u1eddi d\u00f9ng t\u1ef1 \u0111\u1ecbnh ngh\u0129a<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Ng\u01b0\u1eddi d\u00f9ng \u0111\u1ecbnh ngh\u0129a h\u00e0m th\u00f4ng qua t\u1eeb kh\u00f3a \u201c<code>function<\/code>\u201d:<\/p>\n\n\n\n<p><strong><u>C\u00fa ph\u00e1p<\/u><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function ten_ham() {\n     code th\u1ef1c thi\n}<\/code><\/pre>\n\n\n\n<p><strong>Ch\u00fa \u00fd<\/strong>: t\u00ean h\u00e0m ch\u1ec9 c\u00f3 th\u1ec3 b\u1eaft \u0111\u1ea7u v\u1edbi k\u00fd t\u1ef1 ho\u1eb7c d\u1ea5u g\u1ea1ch d\u01b0\u1edbi nh\u01b0ng kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p b\u1eaft \u0111\u1ea7u v\u1edbi s\u1ed1 (0, 1,..,9). T\u00ean h\u00e0m kh\u00f4ng ph\u00e2n bi\u1ec7t ch\u1eef hoa hay ch\u1eef th\u01b0\u1eddng.<\/p>\n\n\n\n<p><strong>M\u1eb9o<\/strong>: n\u00ean \u0111\u1eb7t t\u00ean h\u00e0m g\u1ee3i nh\u1eafc \u0111\u1ebfn vi\u1ec7c m\u00e0 n\u00f3 th\u1ef1c hi\u1ec7n!<\/p>\n\n\n\n<p>T\u00ean h\u00e0m l\u00e0 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi c\u1ea3 c\u00e1ch vi\u1ebft hoa v\u00e0 vi\u1ebft th\u01b0\u1eddng. M\u1eb7c d\u00f9 v\u1eady b\u1ea1n v\u1eabn n\u00ean th\u1ed1ng nh\u1ea5t c\u00e1ch vi\u1ebft.<\/p>\n\n\n\n<p>Trong v\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y, ch\u00fang t\u00f4i t\u1ea1o h\u00e0m c\u00f3 t\u00ean \u201c<code>gui_thong_diep()<\/code>\u201d. Sau t\u00ean h\u00e0m l\u00e0 d\u1ea5u ngo\u1eb7c nh\u1ecdn m\u1edf (&nbsp;<strong>{&nbsp;<\/strong>) v\u00e0 k\u1ebft th\u00fac b\u1eb1ng d\u1ea5u ngo\u1eb7c \u0111\u00f3ng (&nbsp;<strong>}&nbsp;<\/strong>). H\u00e0m s\u1ebd g\u1eedi ra th\u00f4ng \u0111i\u1ec7p \u201cCh\u00e0o m\u1eebng b\u1ea1n \u0111\u1ebfn v\u1edbi Ki\u1ebfn c\u00e0ng!\u201d. \u0110\u1ec3 g\u1ecdi h\u00e0m, ch\u1ec9 c\u1ea7n vi\u1ebft t\u00ean c\u1ee7a n\u00f3 ra l\u00e0 \u0111\u01b0\u1ee3c:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction gui_thong_diep() {\n    echo \"Ch\u00e0o m\u1eebng b\u1ea1n \u0111\u1ebfn v\u1edbi Ki\u1ebfn c\u00e0ng!\";\n}\n\ngui_thong_diep(); \/\/ g\u1ecdi h\u00e0m\n?&gt;<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tao_cac_ham_co_doi_so\"><\/span>T\u1ea1o c\u00e1c h\u00e0m c\u00f3 \u0111\u1ed1i s\u1ed1<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Th\u00f4ng tin c\u00f3 th\u1ec3 g\u1eedi t\u1edbi h\u00e0m th\u00f4ng qua c\u00e1c \u0111\u1ed1i s\u1ed1. \u0110\u1ed1i s\u1ed1 n\u00f3 hao hao gi\u1ed1ng bi\u1ebfn m\u00e0 b\u1ea1n \u0111\u00e3 quen d\u00f9ng trong PHP.<\/p>\n\n\n\n<p>\u0110\u1ed1i s\u1ed1 n\u1eb1m trong ngo\u1eb7c \u0111\u01a1n ngay sau t\u00ean h\u00e0m. B\u1ea1n c\u00f3 th\u1ec3 th\u00eam bao nhi\u00eau \u0111\u1ed1i s\u1ed1 t\u00f9y \u00fd, ch\u1ec9 vi\u1ec7c ng\u0103n c\u00e1ch ch\u00fang v\u1edbi nhau b\u1eb1ng d\u1ea5u ph\u1ea9y.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y l\u00e0 h\u00e0m \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng v\u1edbi m\u1ed9t \u0111\u1ed1i s\u1ed1 l\u00e0 (<code>$thu_nhap<\/code>). Khi h\u00e0m <code>thue_thu_nhap()<\/code> \u0111\u01b0\u1ee3c g\u1ecdi, n\u00f3 s\u1ebd g\u1eedi th\u00f4ng tin c\u1ee7a <code>$thu_nhap<\/code> \u0111\u1ebfn h\u00e0m <code>thue_thu_nhap()<\/code>, sau \u0111\u00f3 h\u00e0m <code>thue_thu_nhap()<\/code> x\u1eed l\u00fd th\u00f4ng tin r\u1ed3i tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction thue_thu_nhap($thu_nhap) {\n   echo ($thu_nhap * 2)\/100;\n}\n\nthue_thu_nhap(5000);\n?&gt;<\/code><\/pre>\n\n\n\n<p>K\u1ebft qu\u1ea3 s\u1ebd l\u00e0 100.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>V\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y s\u1eed d\u1ee5ng h\u00e0m c\u00f3 2 \u0111\u1ed1i s\u1ed1 l\u00e0 (<code>$thu_nhap<\/code> v\u00e0 <code>$bao_hiem<\/code>)<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction thue_thu_nhap($thu_nhap, $bao_hiem) {\n    $thue = ($thu_nhap * 2)\/100;\n\necho \"Thu\u1ebf thu nh\u1eadp: $thue. B\u1ea3o hi\u1ec3m h\u00e0ng th\u00e1ng: $bao_hiem\";\n}\n\nthue_thu_nhap(5000, 200);\n?&gt;<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Doi_so_mac_dinh_trong_PHP\"><\/span>\u0110\u1ed1i s\u1ed1 m\u1eb7c \u0111\u1ecbnh trong PHP<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>V\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y \u0111\u01b0a ra c\u00e1ch s\u1eed d\u1ee5ng \u0111\u1ed1i s\u1ed1 m\u1eb7c \u0111\u1ecbnh trong h\u00e0m, khi b\u1ea1n kh\u00f4ng ghi r\u00f5 gi\u00e1 tr\u1ecb c\u1ee7a \u0111\u1ed1i s\u1ed1 trong l\u1eddi m\u1eddi g\u1ecdi h\u00e0m n\u00f3 s\u1ebd s\u1eed d\u1ee5ng \u0111\u1ed1i s\u1ed1 m\u1eb7c \u0111\u1ecbnh:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction setHeight(int $minheight = 150) {\n   echo \"Chi\u1ec1u cao l\u00e0 : $minheight &lt;br&gt;\";\n}\n\nsetHeight(170);\nsetHeight(); \/\/ S\u1ebd s\u1eed d\u1ee5ng \u0111\u1ed1i s\u1ed1 m\u1eb7c \u0111\u1ecbnh l\u00e0 150\nsetHeight(180);\nsetHeight(165);\n?&gt;<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ham_PHP_%E2%80%93_tra_ve_gia_tri_cu_the\"><\/span>H\u00e0m PHP \u2013 tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb c\u1ee5 th\u1ec3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110\u1ec3 y\u00eau c\u1ea7u h\u00e0m tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb, ch\u00fang ta s\u1eed d\u1ee5ng c\u00e2u l\u1ec7nh <code>return<\/code>:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction tinh_tong($x, $y) {\n   $z = $x + $y;\n\nreturn $z;\n}\n\necho \"5 + 10 = \" . tinh_tong(5, 10) . \"&lt;br&gt;\";\necho \"7 + 13 = \" . tinh_tong(7, 13) . \"&lt;br&gt;\";\necho \"2 + 4 = \" . tinh_tong(2, 4);\n?&gt;<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PHP_la_ngon_ngu_kha_long\"><\/span>PHP l\u00e0 ng\u00f4n ng\u1eef kh\u00e1 l\u1ecfng<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Trong m\u1ed9t s\u1ed1 v\u00ed d\u1ee5 tr\u00ean, c\u1ea7n l\u01b0u \u00fd l\u00e0 ch\u00fang ta kh\u00f4ng n\u00f3i v\u1edbi PHP ki\u1ec3u d\u1eef li\u1ec7u c\u1ee7a bi\u1ebfn l\u00e0 g\u00ec.<\/p>\n\n\n\n<p>PHP t\u1ef1 \u0111\u1ed9ng li\u00ean k\u1ebft ki\u1ec3u d\u1eef li\u1ec7u v\u1edbi bi\u1ebfn, t\u00f9y thu\u1ed9c v\u00e0o gi\u00e1 tr\u1ecb c\u1ee7a n\u00f3 th\u1ebf n\u00e0o. V\u00ec c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u1eb7t m\u1ed9t c\u00e1ch ch\u1eb7t ch\u1ebd, b\u1ea1n c\u00f3 th\u1ec3 l\u00e0m nh\u1eefng th\u1ee9 ki\u1ec3u nh\u01b0 l\u00e0 th\u00eam m\u1ed9t chu\u1ed7i v\u00e0o s\u1ed1 nguy\u00ean m\u00e0 kh\u00f4ng g\u00e2y ra l\u1ed7i.<\/p>\n\n\n\n<p>Trong PHP 7, khai b\u00e1o ki\u1ec3u \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p ch\u00fang ta t\u00f9y ch\u1ecdn ch\u1ec9 \u0111\u1ecbnh m\u1ed9t ki\u1ec3u d\u1eef li\u1ec7u mong mu\u1ed1n khi khai b\u00e1o m\u1ed9t h\u00e0m, v\u00e0 b\u1eb1ng c\u00e1ch th\u00eam khai b\u00e1o <code>strict<\/code>, n\u00f3 s\u1ebd n\u00e9m ra &#8220;<code>Fatal Error<\/code>&#8221; n\u1ebfu ki\u1ec3u d\u1eef li\u1ec7u kh\u00f4ng kh\u1edbp.<\/p>\n\n\n\n<p>Trong v\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y, ch\u00fang ta g\u1eedi c\u1ea3 s\u1ed1 v\u00e0 chu\u1ed7i t\u1edbi h\u00e0m m\u00e0 kh\u00f4ng s\u1eed d\u1ee5ng <code>strict<\/code>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction addNumbers(int $a, int $b) {\n  return $a + $b;\n}\necho addNumbers(5, \"5 days\");\n\/\/ V\u00ec strict KH\u00d4NG b\u1eadt n\u00ean \"5 days\"\n \u0111\u01b0\u1ee3c chuy\u1ec3n th\u00e0nh int(5), v\u00e0 n\u00f3 s\u1ebd tr\u1ea3 v\u1ec1 10\n?&gt;<\/code><\/pre>\n\n\n\n<p>\u0110\u1ec3 ch\u1ec9 \u0111\u1ecbnh <code>strict<\/code>, ch\u00fang ta c\u1ea7n thi\u1ebft l\u1eadp <code>declare(strict_types=1);<\/code><\/p>\n\n\n\n<p>\u0110\u00e2y ph\u1ea3i l\u00e0 d\u00f2ng \u0111\u1ea7u ti\u00ean trong file PHP.<\/p>\n\n\n\n<p>Trong v\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y, ch\u00fang ta g\u1eedi c\u1ea3 s\u1ed1 v\u00e0 chu\u1ed7i t\u1edbi h\u00e0m, nh\u01b0ng tr\u01b0\u1eddng h\u1ee3p n\u00e0y, ch\u00fang ta \u0111\u00e3 th\u00eam khai b\u00e1o <code>strict<\/code>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php declare(strict_types=1); \/\/ strict requirement\n\nfunction addNumbers(int $a, int $b) {\n  return $a + $b;\n}\necho addNumbers(5, \"5 days\");\n\/\/ V\u00ec strict \u0111\u01b0\u1ee3c b\u1eadt v\u00e0 \"5 days\" kh\u00f4ng ph\u1ea3i l\u00e0 s\u1ed1, l\u1ed7i s\u1ebd xu\u1ea5t hi\u1ec7n\n?&gt;<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>S\u1ee9c m\u1ea1nh th\u1ef1c s\u1ef1 c\u1ee7a PHP \u0111\u1ebfn t\u1eeb c\u00e1c h\u00e0m; n\u00f3 c\u00f3 h\u01a1n 1000 h\u00e0m x\u00e2y d\u1ef1ng s\u1eb5n cho b\u1ea1n s\u1eed d\u1ee5ng. Ng\u01b0\u1eddi d\u00f9ng t\u1ef1 \u0111\u1ecbnh ngh\u0129a h\u00e0m B\u00ean c\u1ea1nh c\u00e1c h\u00e0m x\u00e2y d\u1ef1ng s\u1eb5n, ch\u00fang ta c\u00f3 th\u1ec3 t\u1ef1 t\u1ea1o c\u00e1c h\u00e0m d\u00f9ng cho ri\u00eang m\u00ecnh. H\u00e0m l\u00e0 kh\u1ed1i l\u1ec7nh c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng &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>H\u00e0m (function) trong PHP &#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\/ham-trong-php\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"H\u00e0m (function) trong PHP &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"S\u1ee9c m\u1ea1nh th\u1ef1c s\u1ef1 c\u1ee7a PHP \u0111\u1ebfn t\u1eeb c\u00e1c h\u00e0m; n\u00f3 c\u00f3 h\u01a1n 1000 h\u00e0m x\u00e2y d\u1ef1ng s\u1eb5n cho b\u1ea1n s\u1eed d\u1ee5ng. Ng\u01b0\u1eddi d\u00f9ng t\u1ef1 \u0111\u1ecbnh ngh\u0129a h\u00e0m B\u00ean c\u1ea1nh c\u00e1c h\u00e0m x\u00e2y d\u1ef1ng s\u1eb5n, ch\u00fang ta c\u00f3 th\u1ec3 t\u1ef1 t\u1ea1o c\u00e1c h\u00e0m d\u00f9ng cho ri\u00eang m\u00ecnh. 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