{"id":651,"date":"2012-05-10T09:17:16","date_gmt":"2012-05-10T09:17:16","guid":{"rendered":"http:\/\/www.withinweb.com\/info\/?p=651"},"modified":"2012-06-20T13:30:34","modified_gmt":"2012-06-20T13:30:34","slug":"use-regular-expressions-to-validate-php-inputs","status":"publish","type":"post","link":"https:\/\/www.withinweb.com\/info\/use-regular-expressions-to-validate-php-inputs\/","title":{"rendered":"Use regular expressions to validate PHP inputs"},"content":{"rendered":"

To help counter SQL injections you need to make sure that entered values use minimum character types as possible.\u00a0 So you restrict usernames to just a-z and 0-9 characters.<\/p>\n

To test for these, use something like :<\/p>\n

\/\/——————————————————
\n\/**
\n* Purpose : Check input for paticular characters
\n* Only allow a – z, A – Z , 0-9
\n* returns true if a match was found, false if no match was found
\n* @return boolean
\n*\/
\nfunction is_valid_input($words) {<\/p>\n

if ( preg_match( “\/[^0-9a-zA-Z]\/”, $words, $array ) )
\nreturn false;\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/invalid characters
\nelse
\nreturn true;\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/valid characters<\/p>\n

}<\/p>\n","protected":false},"excerpt":{"rendered":"

To help counter SQL injections you need to make sure that entered values use minimum character types as possible.\u00a0 So you restrict usernames to just a-z and 0-9 characters. To test for these, use something like : \/\/—————————————————— \/** *…<\/span><\/p>\n

Read more Use regular expressions to validate PHP inputs<\/span> ›<\/span><\/a><\/div>\n

<\/p>\n","protected":false},"author":40,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,11],"tags":[],"class_list":["post-651","post","type-post","status-publish","format-standard","hentry","category-reg-expressions","category-security-issues"],"yoast_head":"\nUse regular expressions to validate PHP inputs - PHP Web Applications<\/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:\/\/www.withinweb.com\/info\/use-regular-expressions-to-validate-php-inputs\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Use regular expressions to validate PHP inputs - PHP Web Applications\" \/>\n<meta property=\"og:description\" content=\"To help counter SQL injections you need to make sure that entered values use minimum character types as possible.\u00a0 So you restrict usernames to just a-z and 0-9 characters. To test for these, use something like : \/\/—————————————————— \/** *…Read more Use regular expressions to validate PHP inputs ›\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.withinweb.com\/info\/use-regular-expressions-to-validate-php-inputs\/\" \/>\n<meta property=\"og:site_name\" content=\"PHP Web Applications\" \/>\n<meta property=\"article:published_time\" content=\"2012-05-10T09:17:16+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2012-06-20T13:30:34+00:00\" \/>\n<meta name=\"author\" content=\"paulv\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"paulv\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/use-regular-expressions-to-validate-php-inputs\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/use-regular-expressions-to-validate-php-inputs\\\/\"},\"author\":{\"name\":\"paulv\",\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/#\\\/schema\\\/person\\\/04da5531c302d55ffcd777fe81dbb93c\"},\"headline\":\"Use regular expressions to validate PHP inputs\",\"datePublished\":\"2012-05-10T09:17:16+00:00\",\"dateModified\":\"2012-06-20T13:30:34+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/use-regular-expressions-to-validate-php-inputs\\\/\"},\"wordCount\":95,\"commentCount\":0,\"articleSection\":[\"Regular Expressions\",\"Security Issues\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.withinweb.com\\\/info\\\/use-regular-expressions-to-validate-php-inputs\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/use-regular-expressions-to-validate-php-inputs\\\/\",\"url\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/use-regular-expressions-to-validate-php-inputs\\\/\",\"name\":\"Use regular expressions to validate PHP inputs - PHP Web Applications\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/#website\"},\"datePublished\":\"2012-05-10T09:17:16+00:00\",\"dateModified\":\"2012-06-20T13:30:34+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/#\\\/schema\\\/person\\\/04da5531c302d55ffcd777fe81dbb93c\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/use-regular-expressions-to-validate-php-inputs\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.withinweb.com\\\/info\\\/use-regular-expressions-to-validate-php-inputs\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/use-regular-expressions-to-validate-php-inputs\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Use regular expressions to validate PHP inputs\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/#website\",\"url\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/\",\"name\":\"PHP Web Applications\",\"description\":\"Information and support for products of WithinWeb.com\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/#\\\/schema\\\/person\\\/04da5531c302d55ffcd777fe81dbb93c\",\"name\":\"paulv\",\"url\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/author\\\/paulv\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Use regular expressions to validate PHP inputs - PHP Web Applications","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:\/\/www.withinweb.com\/info\/use-regular-expressions-to-validate-php-inputs\/","og_locale":"en_US","og_type":"article","og_title":"Use regular expressions to validate PHP inputs - PHP Web Applications","og_description":"To help counter SQL injections you need to make sure that entered values use minimum character types as possible.\u00a0 So you restrict usernames to just a-z and 0-9 characters. 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