{"id":20234,"date":"2015-01-22T14:04:00","date_gmt":"2015-01-22T14:04:00","guid":{"rendered":"https:\/\/kiencang.net\/2015\/01\/22\/cu-phap-trong-php\/"},"modified":"2015-01-22T14:04:00","modified_gmt":"2015-01-22T14:04:00","slug":"cu-phap-trong-php","status":"publish","type":"post","link":"https:\/\/kiencang.net\/cu-phap-trong-php\/","title":{"rendered":"C\u00fa ph\u00e1p trong PHP"},"content":{"rendered":"\n

C\u00e1c \u0111o\u1ea1n m\u00e3 k\u1ecbch b\u1ea3n c\u1ee7a PHP \u0111\u01b0\u1ee3c th\u1ef1c thi tr\u00ean m\u00e1y ch\u1ee7 v\u00e0 k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 d\u01b0\u1edbi d\u1ea1ng thu\u1ea7n HTML \u0111\u01b0\u1ee3c g\u1eedi cho tr\u00ecnh duy\u1ec7t.<\/p>\n\n\n\n

C\u00fa ph\u00e1p c\u01a1 b\u1ea3n<\/h2>\n\n\n\n

C\u00e1c \u0111o\u1ea1n m\u00e3 k\u1ecbch b\u1ea3n PHP \u0111\u01b0\u1ee3c c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o b\u1ea5t c\u1ee9 n\u01a1i n\u00e0o trong t\u00e0i li\u1ec7u. \u0110o\u1ea1n m\u00e3 PHP b\u1eaft \u0111\u1ea7u b\u1eb1ng\u00a0<?php<\/strong>, v\u00e0 k\u1ebft th\u00fac b\u1eb1ng\u00a0?><\/strong><\/p>\n\n\n\n

V\u00ed d\u1ee5:<\/p>\n\n\n\n

<?php \n       c\u00e1c \u0111o\u1ea1n code \u0111\u01b0\u1ee3c vi\u1ebft \u1edf \u0111\u00e2y \n?> <\/code><\/pre>\n\n\n\n
File PHP \u0111\u01b0\u1ee3c l\u01b0u d\u01b0\u1edbi d\u1ea1ng \u201c.php\u201d th\u00ed d\u1ee5 index.php<\/p>\n\n\n\n
M\u1ed9t trang PHP th\u00f4ng th\u01b0\u1eddng bao g\u1ed3m c\u00e1c \u0111o\u1ea1n m\u00e3 HTML v\u00e0 m\u1ed9t s\u1ed1 k\u1ecbch b\u1ea3n PHP.<\/p>\n\n\n\n
D\u01b0\u1edbi \u0111\u00e2y l\u00e0 \u0111o\u1ea1n m\u00e3 PHP s\u1eed d\u1ee5ng c\u00e2u l\u1ec7nh \u0111\u01a1n gi\u1ea3n v\u00e0 quen thu\u1ed9c echo \u0111\u1ec3 \u0111\u01b0a d\u1eef li\u1ec7u ra m\u00e0n h\u00ecnh:<\/p>\n\n\n\n
<!DOCTYPE html>\n<html>\n<body>\n\n<h1>Trang PHP \u0110\u1ea7u Ti\u00ean C\u1ee7a T\u00f4i<\/h1>\n\n<?php\necho \u201cCh\u00e0o m\u1ecdi ng\u01b0\u1eddi!\u201d;\n?>\n\n<\/body>\n<\/html><\/code><\/pre>\n\n\n\n
C\u00e2u l\u1ec7nh php k\u1ebft th\u00fac v\u1edbi d\u1ea5u ch\u1ea5m ph\u1ea9y ;<\/p>\n\n\n\n
L\u1ed7i qu\u00ean d\u1ea5u ; l\u00e0 l\u1ed7i r\u1ea5t hay g\u1eb7p khi m\u1edbi g\u00f5 code php.<\/p>\n\n\n\n
Ch\u00fa th\u00edch trong PHP<\/h2>\n\n\n\n
Ch\u00fa th\u00edch khi g\u00f5 code r\u1ea5t quan tr\u1ecdng, nh\u1ea5t l\u00e0 v\u1edbi c\u00e1c ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh v\u1ed1n h\u00e0m ch\u1ee9a nhi\u1ec1u \u00fd ngh\u0129a. Ch\u00fa th\u00edch gi\u00fap vi\u1ec7c xem l\u1ea1i code d\u1ec5 hi\u1ec3u h\u01a1n, thu\u1eadn l\u1ee3i cho vi\u1ec7c ch\u1ec9nh s\u1eeda v\u00e0 l\u00e0m vi\u1ec7c nh\u00f3m.\u00a0<\/p>\n\n\n\n
PHP c\u00f3 v\u00e0i c\u00e1ch ch\u00fa th\u00edch<\/a>\u00a0v\u00e0 b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u1ea7y \u0111\u1ee7 qua li\u00ean k\u1ebft v\u1eeba d\u1eabn.<\/p>\n\n\n\n
Ch\u00fa th\u00edch m\u1ed9t d\u00f2ng v\u1edbi d\u1ea5u # ho\u1eb7c \/\/, t\u00f4i hay d\u00f9ng \/\/ \u0111\u1ec3 ch\u00fa th\u00edch m\u1ed9t d\u00f2ng h\u01a1n.<\/p>\n\n\n\n
Ch\u00fa th\u00edch nhi\u1ec1u d\u00f2ng ph\u1ea3i \u0111\u1ec3 trong\u00a0\/* ch\u00fa th\u00edch c\u1ee7a b\u1ea1n \u1edf \u0111\u00e2y *\/<\/em><\/p>\n\n\n\n
Vi\u1ebft hoa v\u00e0 vi\u1ebft th\u01b0\u1eddng c\u00e1c c\u00e2u l\u1ec7nh trong PHP<\/h2>\n\n\n\n
Trong PHP, t\u1ea5t c\u1ea3 c\u00e1c t\u1eeb kh\u00f3a (v\u00ed d\u1ee5 if, else, while, echo, etc.), l\u1edbp, h\u00e0m v\u00e0 c\u00e1c h\u00e0m \u0111\u1ecbnh ngh\u0129a b\u1edfi ng\u01b0\u1eddi d\u00f9ng b\u1ea1n \u0111\u1ec1u c\u00f3 th\u1ec3 vi\u1ebft th\u01b0\u1eddng hay hoa.<\/p>\n\n\n\n
Trong v\u00ed d\u1ee5 b\u00ean d\u01b0\u1edbi, c\u1ea3 3 c\u00e2u l\u1ec7nh echo \u0111\u1ec1u h\u1ee3p l\u1ec7 v\u00e0 cho c\u00f9ng k\u1ebft qu\u1ea3:<\/p>\n\n\n\n
<!DOCTYPE html>\n<html>\n<body>\n\n<?php\nECHO \u201cHello World!<br>\u201d;\necho \u201cHello World!<br>\u201d;\nEcHo \u201cHello World!<br>\u201d;\n?>\n\n<\/body>\n<\/html><\/code><\/pre>\n\n\n\n
D\u0129 nhi\u00ean, \u0111a s\u1ed1 m\u1ecdi ng\u01b0\u1eddi \u01b0a d\u00f9ng c\u00e1ch vi\u1ebft th\u01b0\u1eddng cho nh\u1eefng \u0111o\u1ea1n code.<\/p>\n\n\n\n
Tuy nhi\u00ean\u00a0c\u00e1c bi\u1ebfn<\/strong>\u00a0th\u00ec ph\u00e2n bi\u1ec7t vi\u1ebft hoa v\u00e0 th\u01b0\u1eddng. V\u00ed d\u1ee5:<\/p>\n\n\n\n
<?php\n$duc_anh = \u201c\u0111\u1eb9p trai\u201d;\necho $duc_anh;\necho $Duc_Anh;\necho $DUC_ANH;\n?><\/code><\/pre>\n\n\n\n
Ch\u1ec9 c\u00f3 c\u00e1i \u0111\u1ea7u cho k\u1ebft qu\u1ea3, c\u00f2n hai c\u00e1i b\u00ean d\u01b0\u1edbi kh\u00f4ng cho k\u1ebft qu\u1ea3 g\u00ec.<\/p>\n","protected":false},"excerpt":{"rendered":"
C\u00e1c \u0111o\u1ea1n m\u00e3 k\u1ecbch b\u1ea3n c\u1ee7a PHP \u0111\u01b0\u1ee3c th\u1ef1c thi tr\u00ean m\u00e1y ch\u1ee7 v\u00e0 k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 d\u01b0\u1edbi d\u1ea1ng thu\u1ea7n HTML \u0111\u01b0\u1ee3c g\u1eedi cho tr\u00ecnh duy\u1ec7t. C\u00fa ph\u00e1p c\u01a1 b\u1ea3n C\u00e1c \u0111o\u1ea1n m\u00e3 k\u1ecbch b\u1ea3n PHP \u0111\u01b0\u1ee3c c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o b\u1ea5t c\u1ee9 n\u01a1i n\u00e0o trong t\u00e0i li\u1ec7u. \u0110o\u1ea1n m\u00e3 PHP b\u1eaft \u0111\u1ea7u …<\/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":"\nC\u00fa ph\u00e1p trong PHP • 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\/cu-phap-trong-php\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00fa ph\u00e1p trong PHP • Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"C\u00e1c \u0111o\u1ea1n m\u00e3 k\u1ecbch b\u1ea3n c\u1ee7a PHP \u0111\u01b0\u1ee3c th\u1ef1c thi tr\u00ean m\u00e1y ch\u1ee7 v\u00e0 k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 d\u01b0\u1edbi d\u1ea1ng thu\u1ea7n HTML \u0111\u01b0\u1ee3c g\u1eedi cho tr\u00ecnh duy\u1ec7t. 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C\u00fa ph\u00e1p c\u01a1 b\u1ea3n C\u00e1c \u0111o\u1ea1n m\u00e3 k\u1ecbch b\u1ea3n PHP \u0111\u01b0\u1ee3c c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o b\u1ea5t c\u1ee9 n\u01a1i n\u00e0o trong t\u00e0i li\u1ec7u. \u0110o\u1ea1n m\u00e3 PHP b\u1eaft \u0111\u1ea7u …","og_url":"https:\/\/kiencang.net\/cu-phap-trong-php\/","og_site_name":"Ki\u1ebfn c\u00e0ng","article_author":"https:\/\/www.facebook.com\/anhducnguyen87\/","article_published_time":"2015-01-22T14:04:00+00:00","author":"Nguy\u1ec5n \u0110\u1ee9c Anh","twitter_card":"summary_large_image","twitter_misc":{"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi":"Nguy\u1ec5n \u0110\u1ee9c Anh","\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc":"2 ph\u00fat"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/kiencang.net\/cu-phap-trong-php\/","url":"https:\/\/kiencang.net\/cu-phap-trong-php\/","name":"C\u00fa ph\u00e1p trong PHP • Ki\u1ebfn c\u00e0ng","isPartOf":{"@id":"https:\/\/kiencang.net\/#website"},"datePublished":"2015-01-22T14:04:00+00:00","dateModified":"2015-01-22T14:04:00+00:00","author":{"@id":"https:\/\/kiencang.net\/#\/schema\/person\/5e7e1a04d8d1218ad8c421ba43d25c16"},"breadcrumb":{"@id":"https:\/\/kiencang.net\/cu-phap-trong-php\/#breadcrumb"},"inLanguage":"vi","potentialAction":[{"@type":"ReadAction","target":["https:\/\/kiencang.net\/cu-phap-trong-php\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/kiencang.net\/cu-phap-trong-php\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/kiencang.net\/"},{"@type":"ListItem","position":2,"name":"C\u00fa ph\u00e1p trong PHP"}]},{"@type":"WebSite","@id":"https:\/\/kiencang.net\/#website","url":"https:\/\/kiencang.net\/","name":"Ki\u1ebfn c\u00e0ng","description":"\u00d4m l\u00fd thuy\u1ebft, h\u00f4n th\u1ef1c h\u00e0nh","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/kiencang.net\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"vi"},{"@type":"Person","@id":"https:\/\/kiencang.net\/#\/schema\/person\/5e7e1a04d8d1218ad8c421ba43d25c16","name":"Nguy\u1ec5n \u0110\u1ee9c Anh","image":{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/kiencang.net\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/6d71f9b89393952a8382e30dad26c1ec?s=96&d=monsterid&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/6d71f9b89393952a8382e30dad26c1ec?s=96&d=monsterid&r=g","caption":"Nguy\u1ec5n \u0110\u1ee9c Anh"},"description":"Sinh n\u0103m 1987, t\u1ed1t nghi\u1ec7p Cao \u0111\u1eb3ng th\u1ef1c h\u00e0nh FPT qu\u00e3ng 2014, chuy\u00ean ng\u00e0nh Thi\u1ebft k\u1ebf website. 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