{"id":19,"date":"2015-01-26T15:53:00","date_gmt":"2015-01-26T15:53:00","guid":{"rendered":"https:\/\/kiencang.net\/2015\/01\/26\/ham-rand-va-mt_rand-trong-php\/"},"modified":"2022-08-23T21:48:14","modified_gmt":"2022-08-23T14:48:14","slug":"ham-rand-va-mt_rand-trong-php","status":"publish","type":"post","link":"https:\/\/kiencang.net\/ham-rand-va-mt_rand-trong-php\/","title":{"rendered":"H\u00e0m rand() v\u00e0 mt_rand() trong PHP"},"content":{"rendered":"\n<p>Hai h\u00e0m n\u00e0y c\u00f3 ch\u1ee9c n\u0103ng nh\u01b0 nhau, d\u00f9ng \u0111\u1ec3 t\u1ea1o c\u00e1c s\u1ed1 ng\u1eabu nhi\u00ean. \u0110i\u1ec3m kh\u00e1c bi\u1ec7t duy nh\u1ea5t l\u00e0 h\u00e0m <code>mt_rand()<\/code> nhanh h\u01a1n 4 l\u1ea7n so v\u1edbi h\u00e0m <code>rand()<\/code>. V\u00e0 kh\u00f4ng gian ng\u1eabu nhi\u00ean c\u1ee7a n\u00f3 c\u0169ng r\u1ed9ng h\u01a1n.<\/p>\n\n\n\n<p>C\u00fa ph\u00e1p:<\/p>\n\n\n\n<ul><li><b>rand()<\/b>: s\u1ebd cho ra m\u1ed9t s\u1ed1 nguy\u00ean ng\u1eabu nhi\u00ean, gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t c\u00f3 th\u1ec3 l\u00e0 32767 (c\u00f2n g\u1ecdi l\u00e0 &nbsp;<code>getrandmax<\/code>);<\/li><li><b>mt_rand()<\/b>: s\u1ebd cho ra s\u1ed1 nguy\u00ean ng\u1eabu nhi\u00ean, gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t c\u00f3 th\u1ec3 l\u00e0 2147483647 (c\u00f2n g\u1ecdi l\u00e0 <code>mt_getrandmax<\/code>);<\/li><li><b>rand(min, max)<\/b>: min, max l\u00e0 t\u00f9y ch\u1ecdn. K\u1ebft qu\u1ea3 s\u1ebd cho ra s\u1ed1 ng\u1eabu nhi\u00ean trong kho\u1ea3ng min max (c\u00f3 th\u1ec3 d\u00f9ng s\u1ed1 \u00e2m).<\/li><li><b>mt_rand(min, max)<\/b>:&nbsp;min, max l\u00e0 t\u00f9y ch\u1ecdn. K\u1ebft qu\u1ea3&nbsp;cho ra s\u1ed1 ng\u1eabu nhi\u00ean nguy\u00ean trong kho\u1ea3ng min, max (c\u00f3 th\u1ec3 d\u00f9ng s\u1ed1 \u00e2m).<\/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 rand().\"&lt;\/br&gt;\";\necho mt_rand().\"&lt;\/br&gt;\";\necho rand(13, 345).\"&lt;\/br&gt;\";\necho mt_rand(1, 600).\"&lt;\/br&gt;\";\n?&gt;<\/code><\/pre>\n\n\n\n<p>\u0110\u00e2y l\u00e0 k\u1ebft qu\u1ea3 ng\u1eabu nhi\u00ean c\u1ee7a t\u00f4i:<\/p>\n\n\n\n<p>23840<br>1751926519<br>72<br>41<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hai h\u00e0m n\u00e0y c\u00f3 ch\u1ee9c n\u0103ng nh\u01b0 nhau, d\u00f9ng \u0111\u1ec3 t\u1ea1o c\u00e1c s\u1ed1 ng\u1eabu nhi\u00ean. \u0110i\u1ec3m kh\u00e1c bi\u1ec7t duy nh\u1ea5t l\u00e0 h\u00e0m mt_rand() nhanh h\u01a1n 4 l\u1ea7n so v\u1edbi h\u00e0m rand(). V\u00e0 kh\u00f4ng gian ng\u1eabu nhi\u00ean c\u1ee7a n\u00f3 c\u0169ng r\u1ed9ng h\u01a1n. C\u00fa ph\u00e1p: rand(): s\u1ebd cho ra m\u1ed9t s\u1ed1 nguy\u00ean ng\u1eabu nhi\u00ean, gi\u00e1 tr\u1ecb l\u1edbn &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","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 rand() v\u00e0 mt_rand() 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-rand-va-mt_rand-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 rand() v\u00e0 mt_rand() trong PHP &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"Hai h\u00e0m n\u00e0y c\u00f3 ch\u1ee9c n\u0103ng nh\u01b0 nhau, d\u00f9ng \u0111\u1ec3 t\u1ea1o c\u00e1c s\u1ed1 ng\u1eabu nhi\u00ean. \u0110i\u1ec3m kh\u00e1c bi\u1ec7t duy nh\u1ea5t l\u00e0 h\u00e0m mt_rand() nhanh h\u01a1n 4 l\u1ea7n so v\u1edbi h\u00e0m rand(). V\u00e0 kh\u00f4ng gian ng\u1eabu nhi\u00ean c\u1ee7a n\u00f3 c\u0169ng r\u1ed9ng h\u01a1n. C\u00fa ph\u00e1p: rand(): s\u1ebd cho ra m\u1ed9t s\u1ed1 nguy\u00ean ng\u1eabu nhi\u00ean, gi\u00e1 tr\u1ecb l\u1edbn &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kiencang.net\/ham-rand-va-mt_rand-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=\"2015-01-26T15:53:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-08-23T14:48:14+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=\"1 ph\u00fat\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"H\u00e0m rand() v\u00e0 mt_rand() 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-rand-va-mt_rand-trong-php\/","og_locale":"vi_VN","og_type":"article","og_title":"H\u00e0m rand() v\u00e0 mt_rand() trong PHP &#8226; Ki\u1ebfn c\u00e0ng","og_description":"Hai h\u00e0m n\u00e0y c\u00f3 ch\u1ee9c n\u0103ng nh\u01b0 nhau, d\u00f9ng \u0111\u1ec3 t\u1ea1o c\u00e1c s\u1ed1 ng\u1eabu nhi\u00ean. \u0110i\u1ec3m kh\u00e1c bi\u1ec7t duy nh\u1ea5t l\u00e0 h\u00e0m mt_rand() nhanh h\u01a1n 4 l\u1ea7n so v\u1edbi h\u00e0m rand(). V\u00e0 kh\u00f4ng gian ng\u1eabu nhi\u00ean c\u1ee7a n\u00f3 c\u0169ng r\u1ed9ng h\u01a1n. 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