{"id":20,"date":"2015-01-26T15:25:00","date_gmt":"2015-01-26T15:25:00","guid":{"rendered":"https:\/\/kiencang.net\/2015\/01\/26\/ham-abs-trong-php\/"},"modified":"2015-01-26T15:25:00","modified_gmt":"2015-01-26T15:25:00","slug":"ham-abs-trong-php","status":"publish","type":"post","link":"https:\/\/kiencang.net\/ham-abs-trong-php\/","title":{"rendered":"H\u00e0m abs() trong PHP"},"content":{"rendered":"\n<p>H\u00e0m abs() d\u00f9ng \u0111\u1ec3 l\u1ea5y gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a m\u1ed9t gi\u00e1 tr\u1ecb. N\u1ebfu c\u00f2n nh\u1edb m\u00f4n to\u00e1n h\u1ed3i c\u1ea5p 2, b\u1ea1n s\u1ebd hi\u1ec3u gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i l\u00e0 g\u00ec.<\/p>\n\n\n\n<p>D\u00e0nh cho nh\u1eefng ai ch\u01b0a r\u00f5:<\/p>\n\n\n\n<ul><li>Gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a 0 l\u00e0 0<\/li><li>Gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a m\u1ed9t s\u1ed1 d\u01b0\u01a1ng A l\u00e0 ch\u00ednh s\u1ed1 A \u0111\u00f3<\/li><li>Gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a s\u1ed1 \u00e2m X l\u00e0 s\u1ed1 d\u01b0\u01a1ng Y sao cho X&nbsp;+ Y = 0<\/li><\/ul>\n\n\n\n<p>V\u00ed d\u1ee5 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a 3 l\u00e0 3, c\u1ee7a &#8211; 2.5 l\u00e0 2.5<\/p>\n\n\n\n<p>C\u00fa ph\u00e1p trong PHP: <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>abs(s\u1ed1)<\/code><\/pre>\n\n\n\n<p>Th\u00f4ng tin k\u1ef9 thu\u1eadt:<\/p>\n\n\n\n<ul><li>Tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb l\u00e0 s\u1ed1.<\/li><li>N\u1ebfu tham s\u1ed1 \u0111\u1ea7u v\u00e0o l\u00e0 d\u1ea1ng float, gi\u00e1 tr\u1ecb tr\u1ea3 v\u1ec1 c\u0169ng \u1edf d\u1ea1ng float. N\u1ebfu tham s\u1ed1 \u0111\u1ea7u v\u00e0o l\u00e0 s\u1ed1 th\u1ef1c, gi\u00e1 tr\u1ecb tr\u1ea3 v\u1ec1 c\u0169ng l\u00e0 s\u1ed1 th\u1ef1c.<\/li><li>Phi\u00ean b\u1ea3n PHP y\u00eau c\u1ea7u: b\u1ea3n 4 tr\u1edf l\u00ean.<\/li><\/ul>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\necho(abs(6) . \"&lt;br>\");\necho(abs(-9) . \"&lt;br>\");\necho(abs(-3.1) . \"&lt;br>\");\necho(abs(3.1));\n?><\/code><\/pre>\n\n\n\n<p>K\u1ebft qu\u1ea3:<\/p>\n\n\n\n<p>6<br>9<br>3.1<br>3.1<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">T\u1ef1 thi\u1ebft k\u1ebf h\u00e0m ri\u00eang<\/h3>\n\n\n\n<p>B\u1ea1n c\u00f3 t\u1ef1 tay thi\u1ebft k\u1ebf \u0111\u01b0\u1ee3c h\u00e0m ri\u00eang gi\u1ed1ng h\u00e0m abs() trong PHP kh\u00f4ng? C\u00e2u tr\u1ea3 l\u1eddi l\u00e0 c\u00f3. R\u1ea5t \u0111\u01a1n gi\u1ea3n th\u00f4i. D\u01b0\u1edbi \u0111\u00e2y t\u00f4i s\u1ebd tr\u00ecnh b\u00e0y m\u1ed9t c\u00e1ch:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction GT_TD($x) {\nif ($x>=0) {$y = $x;} else {$y = (-1) * $x;}\nreturn $y;\n}\necho(GT_TD(6) . \"&lt;br>\");\necho(GT_TD(-9) . \"&lt;br>\");\necho(GT_TD(-3.1) . \"&lt;br>\");\necho(GT_TD(3.1));\n?><\/code><\/pre>\n\n\n\n<p>Ch\u1ea1y \u0111o\u1ea1n code tr\u00ean b\u1ea1n s\u1ebd th\u1ea5y n\u00f3 cho k\u1ebft qu\u1ea3 t\u01b0\u01a1ng t\u1ef1 h\u00e0m abs().<\/p>\n","protected":false},"excerpt":{"rendered":"<p>H\u00e0m abs() d\u00f9ng \u0111\u1ec3 l\u1ea5y gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a m\u1ed9t gi\u00e1 tr\u1ecb. N\u1ebfu c\u00f2n nh\u1edb m\u00f4n to\u00e1n h\u1ed3i c\u1ea5p 2, b\u1ea1n s\u1ebd hi\u1ec3u gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i l\u00e0 g\u00ec. D\u00e0nh cho nh\u1eefng ai ch\u01b0a r\u00f5: Gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a 0 l\u00e0 0 Gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a m\u1ed9t s\u1ed1 d\u01b0\u01a1ng A l\u00e0 ch\u00ednh &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 abs() 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-abs-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 abs() trong PHP &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"H\u00e0m abs() d\u00f9ng \u0111\u1ec3 l\u1ea5y gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a m\u1ed9t gi\u00e1 tr\u1ecb. 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D\u00e0nh cho nh\u1eefng ai ch\u01b0a r\u00f5: Gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a 0 l\u00e0 0 Gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a m\u1ed9t s\u1ed1 d\u01b0\u01a1ng A l\u00e0 ch\u00ednh &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kiencang.net\/ham-abs-trong-php\/\" \/>\n<meta property=\"og:site_name\" content=\"Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/anhducnguyen87\/\" \/>\n<meta property=\"article:published_time\" content=\"2015-01-26T15:25:00+00:00\" \/>\n<meta name=\"author\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 ph\u00fat\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"H\u00e0m abs() trong PHP &#8226; Ki\u1ebfn c\u00e0ng","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/kiencang.net\/ham-abs-trong-php\/","og_locale":"vi_VN","og_type":"article","og_title":"H\u00e0m abs() trong PHP &#8226; Ki\u1ebfn c\u00e0ng","og_description":"H\u00e0m abs() d\u00f9ng \u0111\u1ec3 l\u1ea5y gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a m\u1ed9t gi\u00e1 tr\u1ecb. 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