{"id":12410,"date":"2013-08-23T07:21:00","date_gmt":"2013-08-23T07:21:00","guid":{"rendered":"https:\/\/kiencang.net\/2013\/08\/23\/lap-trinh-web-khai-bao-bien-va-hang-trong-php\/"},"modified":"2013-08-23T07:21:00","modified_gmt":"2013-08-23T07:21:00","slug":"lap-trinh-web-khai-bao-bien-va-hang-trong-php","status":"publish","type":"post","link":"https:\/\/kiencang.net\/lap-trinh-web-khai-bao-bien-va-hang-trong-php\/","title":{"rendered":"L\u1eadp tr\u00ecnh web: Khai b\u00e1o bi\u1ebfn v\u00e0 h\u1eb1ng trong PHP"},"content":{"rendered":"\n<p>Bi\u1ebfn \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 l\u01b0u c\u00e1c d\u1eef li\u1ec7u c\u00f3 th\u1ec3 thay \u0111\u1ed5i, bi\u1ebfn trong PHP \u0111\u01b0\u1ee3c k\u00ed hi\u1ec7u b\u1eb1ng k\u00fd t\u1ef1 m\u00e0 h\u1ea7u nh\u01b0 ai c\u0169ng th\u00edch &#8211; \u0111\u00f3 l\u00e0 \u0111\u1ed3ng \u0111\u00f4-la: <code>$<\/code><\/p>\n\n\n\n<p>Kh\u00f4ng gi\u1ed1ng c\u00e1c ng\u00f4n ng\u1eef kh\u00e1c, trong PHP b\u1ea1n kh\u00f4ng c\u1ea7n ph\u1ea3i khai b\u00e1o ki\u1ec3u d\u1eef li\u1ec7u cho bi\u1ebfn, PHP s\u1ebd t\u1ef1 nh\u1eadn bi\u1ebft v\u00e0 g\u00e1n ki\u1ec3u d\u1eef li\u1ec7u th\u00edch h\u1ee3p.<\/p>\n\n\n\n<p>Ch\u1eb3ng h\u1ea1n khi b\u1ea1n g\u00e1n gi\u00e1 tr\u1ecb cho bi\u1ebfn <code>$tong_hang_hoa = 125<\/code>, th\u00ec ki\u1ec3u d\u1eef li\u1ec7u c\u1ee7a bi\u1ebfn <code>$tong_hang_hoa<\/code> s\u1ebd l\u00e0 s\u1ed1 nguy\u00ean.<\/p>\n\n\n\n<p>M\u1ed9t s\u1ed1 v\u00ed d\u1ee5 v\u1ec1 khai b\u00e1o bi\u1ebfn:<\/p>\n\n\n\n<ul><li>$hoten = \u2018Nguy\u1ec5n \u0110\u1ee9c Anh \u2013 Ki\u1ebfn c\u00e0ng\u2019;<\/li><li>$gia = 10.5;<\/li><li>$soluong = 32;<\/li><li>$ket_qua = TRUE;<\/li><li>$cuoi_cung = $ket_qua;<\/li><\/ul>\n\n\n\n<p>D\u1ea5u \u201c=\u201d \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 to\u00e1n t\u1eed g\u00e1n.<\/p>\n\n\n\n<p>L\u01b0u \u00fd l\u00e0 trong PHP c\u00f3 ph\u00e2n bi\u1ec7t ch\u1eef IN HOA v\u00e0 ch\u1eef th\u01b0\u1eddng cho t\u00ean c\u1ee7a bi\u1ebfn, t\u1ee9c l\u00e0 bi\u1ebfn $hoten s\u1ebd kh\u00e1c bi\u1ebfn $Hoten v\u00e0 c\u0169ng kh\u00e1c bi\u1ebfn $hoTen hay $HoTen n\u1ed1t (nh\u01b0ng h\u00e0m trong PHP th\u00ec kh\u00f4ng ph\u00e2n bi\u1ec7t hoa v\u1edbi th\u01b0\u1eddng). V\u1ec1 quy t\u1eafc \u0111\u1eb7t t\u00ean bi\u1ebfn th\u00ec ch\u00fang ch\u1ec9 \u0111\u01b0\u1ee3c ph\u00e9p ch\u1ee9a ch\u1eef c\u00e1i, s\u1ed1 v\u00e0 k\u00fd t\u1ef1 g\u1ea1ch d\u01b0\u1edbi \u201c_\u201d, ngo\u00e0i ra t\u00ean bi\u1ebfn c\u0169ng kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p tr\u00f9ng v\u1edbi t\u1eeb kh\u00f3a c\u1ee7a PHP.<\/p>\n\n\n\n<p>T\u1ea5t nhi\u00ean b\u1ea1n n\u00ean \u0111\u1eb7t t\u00ean bi\u1ebfn c\u00f3 \u00fd ngh\u0129a \u2013 \u0111i\u1ec1u n\u00e0y gi\u00fap b\u1ea1n vi\u1ebft code d\u1ec5 d\u00e0ng h\u01a1n, ch\u1eb3ng h\u1ea1n, n\u1ebfu \u0111\u1eb7t t\u00ean cho bi\u1ebfn n\u0103m sinh b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ec3 l\u00e0 $nam_sinh, kh\u00f4ng n\u00ean vi\u1ebft t\u1eaft theo ki\u1ec3u $ns tr\u1eeb khi k\u00fd hi\u1ec7u vi\u1ebft t\u1eaft \u0111\u00f3 \u0111\u00e3 ph\u1ed5 bi\u1ebfn.<\/p>\n\n\n\n<p>\u0110\u1ec3 <b>khai b\u00e1o h\u1eb1ng<\/b> b\u1ea1n d\u00f9ng t\u1eeb kh\u00f3a define, v\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Define('PI', 3.141592650)<\/code><\/pre>\n\n\n\n<p>C\u00e2u l\u1ec7nh tr\u00ean c\u00f3 ngh\u0129a l\u00e0 t\u00f4i g\u00e1n gi\u00e1 tr\u1ecb 3.141592650 cho h\u1eb1ng s\u1ed1 PI. H\u1eb1ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c vi\u1ebft b\u1eb1ng k\u00fd t\u1ef1 IN HOA. V\u00ec h\u1eb1ng kh\u00f4ng ph\u1ea3i l\u00e0 bi\u1ebfn n\u00ean b\u1ea1n s\u1ebd th\u1ea5y kh\u00f4ng c\u00f3 k\u00fd t\u1ef1 $ \u1edf \u0111\u1eb1ng tr\u01b0\u1edbc n\u00f3.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">V\u1ec1 c\u00e1ch \u0111\u1eb7t t\u00ean bi\u1ebfn<\/h2>\n\n\n\n<p>Tr\u01b0\u1edbc \u0111\u00e2y t\u00f4i hay \u0111\u1eb7t t\u00ean bi\u1ebfn b\u1eb1ng ti\u1ebfng Vi\u1ec7t, nh\u01b0ng v\u1ec1 sau th\u1ea5y nhi\u1ec1u anh ch\u1ecb em n\u00f3i r\u1eb1ng n\u00ean \u0111\u1eb7t b\u1eb1ng ti\u1ebfng Anh s\u1ebd t\u1ed1t h\u01a1n, v\u00ec ngh\u0129a r\u00f5 r\u00e0ng h\u01a1n, v\u00e0 c\u0169ng ph\u00f9 h\u1ee3p trong m\u00f4i tr\u01b0\u1eddng h\u1ee3p t\u00e1c qu\u1ed1c t\u1ebf (n\u1ebfu ch\u00fang ta c\u00f3 c\u01a1 h\u1ed9i).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bi\u1ebfn \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 l\u01b0u c\u00e1c d\u1eef li\u1ec7u c\u00f3 th\u1ec3 thay \u0111\u1ed5i, bi\u1ebfn trong PHP \u0111\u01b0\u1ee3c k\u00ed hi\u1ec7u b\u1eb1ng k\u00fd t\u1ef1 m\u00e0 h\u1ea7u nh\u01b0 ai c\u0169ng th\u00edch &#8211; \u0111\u00f3 l\u00e0 \u0111\u1ed3ng \u0111\u00f4-la: $ Kh\u00f4ng gi\u1ed1ng c\u00e1c ng\u00f4n ng\u1eef kh\u00e1c, trong PHP b\u1ea1n kh\u00f4ng c\u1ea7n ph\u1ea3i khai b\u00e1o ki\u1ec3u d\u1eef li\u1ec7u cho bi\u1ebfn, PHP s\u1ebd t\u1ef1 &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>L\u1eadp tr\u00ecnh web: Khai b\u00e1o bi\u1ebfn v\u00e0 h\u1eb1ng 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\/lap-trinh-web-khai-bao-bien-va-hang-trong-php\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L\u1eadp tr\u00ecnh web: Khai b\u00e1o bi\u1ebfn v\u00e0 h\u1eb1ng trong PHP &#8226; 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