{"id":3519,"date":"2017-08-16T12:50:26","date_gmt":"2017-08-16T09:50:26","guid":{"rendered":"http:\/\/kamil-abzalov.com\/tutorials\/form-validation-server-side\/"},"modified":"2020-04-09T00:27:04","modified_gmt":"2020-04-08T21:27:04","slug":"form-validation-server-side","status":"publish","type":"post","link":"https:\/\/kamil-abzalov.com\/en\/tutorials\/php\/form-validation-server-side\/","title":{"rendered":"Form validation server side"},"content":{"rendered":"

[et_pb_section fb_built=”1″ fullwidth=”on” _builder_version=”3.22″][et_pb_fullwidth_header title=”Form validation server side” content_max_width=”none” _builder_version=”3.16″ button_one_letter_spacing_hover=”0″ button_two_letter_spacing_hover=”0″ button_one_text_size__hover_enabled=”off” button_two_text_size__hover_enabled=”off” button_one_text_color__hover_enabled=”off” button_two_text_color__hover_enabled=”off” button_one_border_width__hover_enabled=”off” button_two_border_width__hover_enabled=”off” button_one_border_color__hover_enabled=”off” button_two_border_color__hover_enabled=”off” button_one_border_radius__hover_enabled=”off” button_two_border_radius__hover_enabled=”off” button_one_letter_spacing__hover_enabled=”on” button_one_letter_spacing__hover=”0″ button_two_letter_spacing__hover_enabled=”on” button_two_letter_spacing__hover=”0″ button_one_bg_color__hover_enabled=”off” button_two_bg_color__hover_enabled=”off”][\/et_pb_fullwidth_header][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”section” _builder_version=”3.22″][et_pb_row admin_label=”row” _builder_version=”3.25″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” custom_padding=”0px|||”][et_pb_column type=”4_4″ _builder_version=”3.25″ custom_padding=”|||” custom_padding__hover=”|||”][et_pb_dcsbcm_divi_breadcrumbs_module homebreadcrumbtext=”Home” hide_currentbreadcrumb=”off” _builder_version=”4.4.2″ custom_padding=”0px|||” hover_enabled=”0″ fontsbreadcrumbs_font_size_tablet=”51″ fontsbreadcrumbs_line_height_tablet=”2″ fontsseperator_font_size_tablet=”51″ fontsseperator_line_height_tablet=”2″ fontsbreadcrumblinks_font_size_tablet=”51″ fontsbreadcrumblinks_line_height_tablet=”2″][\/et_pb_dcsbcm_divi_breadcrumbs_module][et_pb_text _builder_version=”3.27.4″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” use_border_color=”off” border_color=”#ffffff” border_style=”solid”]Today we’ll consider data validation on server side with build-in php functions. Any html form is potential danger for your project because of information from this form. User not necessary wants to hurt you. He can enter some spaces. Spaces are not a problem, but you are recommended to store clean data.
\n[\/et_pb_text][et_pb_video src=”https:\/\/www.youtube.com\/watch?v=y5Yx0yoWL7A” _builder_version=”3.0.47″][\/et_pb_video][et_pb_text _builder_version=”3.27.4″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” use_border_color=”off” border_color=”#ffffff” border_style=”solid”]In this tutorial we will consider several situations%<\/p>\n

    \n
  1. xss injection detection – we will use strip_tags function<\/li>\n
  2. remove spaces – we will use trim function<\/li>\n
  3. if you wish to use html tags in input , for this purpose php has hot htmlspecialchars function. This function modify tags into html entities. You can find codes of these entities in Internet.
    \n For example, this link<\/a>.<\/li>\n<\/ol>\n

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    Today we’ll consider data validation on server side with build-in php functions. Any html form is potential danger for your project because of information from this form. User not necessary wants to hurt you. He can enter some spaces. Spaces are not a problem, but you are recommended to store clean data. In this tutorial […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"\u0412 \u044d\u0442\u043e\u043c \u0443\u0440\u043e\u043a\u0435 \u043c\u044b \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u0432\u0430\u043b\u0438\u0434\u0430\u0446\u0438\u044e \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u0441\u0442\u043e\u0440\u043e\u043d\u0435 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u0439 \u044f\u0437\u044b\u043a\u0430 php. \u041b\u044e\u0431\u0430\u044f \u0444\u043e\u0440\u043c\u0430 \u043d\u0430 \u0441\u0430\u0439\u0442\u0435 - \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u0430\u044f \u0443\u0433\u0440\u043e\u0437\u0430 \u0434\u043b\u044f \u0432\u0430\u0448\u0435\u0433\u043e \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u0441 \u0442\u043e\u0447\u043a\u0438 \u0437\u0440\u0435\u043d\u0438\u044f \u0437\u0430\u043f\u0438\u0441\u0438 \u0438 \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u0432\u0432\u0435\u0434\u0435\u043d\u043d\u043e\u0439 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0435\u0439. \u041f\u0440\u0438\u0447\u0435\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u043d\u0435\u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u043e \u0445\u043e\u0447\u0435\u0442 \u0432\u0430\u043c \u043d\u0430\u0432\u0440\u0435\u0434\u0438\u0442\u044c - 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    <\/pre>","_et_gb_content_width":"","footnotes":""},"categories":[273,219],"tags":[240],"class_list":["post-3519","post","type-post","status-publish","format-standard","hentry","category-php","category-tutorials","tag-php-en"],"yoast_head":"\nForm validation server side - Kamil Abzalov's blog<\/title>\n<meta name=\"description\" content=\"In this tutorial we'll discuss question about safety of data, receives from html forms\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kamil-abzalov.com\/videouroki\/php\/php-form-validation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Form validation server side - Kamil Abzalov's blog\" \/>\n<meta property=\"og:description\" content=\"In this tutorial we'll discuss question about safety of data, receives from html forms\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kamil-abzalov.com\/videouroki\/php\/php-form-validation\/\" \/>\n<meta property=\"og:site_name\" content=\"\u0441\u0430\u0439\u0442 \u041a\u0430\u043c\u0438\u043b\u044f \u0410\u0431\u0437\u0430\u043b\u043e\u0432\u0430\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/kamabzalov\" \/>\n<meta property=\"article:published_time\" content=\"2017-08-16T09:50:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-04-08T21:27:04+00:00\" \/>\n<meta name=\"author\" content=\"Kamil' Abzalov\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Form validation server side\" \/>\n<meta name=\"twitter:description\" content=\"In this tutorial we'll discuss question about safety of data, receives from html forms\" \/>\n<meta name=\"twitter:creator\" content=\"@kamabzalov\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kamil' Abzalov\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/kamil-abzalov.com\\\/videouroki\\\/php\\\/php-form-validation\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/kamil-abzalov.com\\\/videouroki\\\/php\\\/php-form-validation\\\/\"},\"author\":{\"name\":\"Kamil' Abzalov\",\"@id\":\"https:\\\/\\\/kamil-abzalov.com\\\/#\\\/schema\\\/person\\\/9c53360f21b83306ba40c2231573c600\"},\"headline\":\"Form validation server side\",\"datePublished\":\"2017-08-16T09:50:26+00:00\",\"dateModified\":\"2020-04-08T21:27:04+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/kamil-abzalov.com\\\/videouroki\\\/php\\\/php-form-validation\\\/\"},\"wordCount\":595,\"commentCount\":0,\"keywords\":[\"php\"],\"articleSection\":[\"PHP\",\"Tutorials\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/kamil-abzalov.com\\\/videouroki\\\/php\\\/php-form-validation\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/kamil-abzalov.com\\\/videouroki\\\/php\\\/php-form-validation\\\/\",\"url\":\"https:\\\/\\\/kamil-abzalov.com\\\/videouroki\\\/php\\\/php-form-validation\\\/\",\"name\":\"Form validation server side - 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