{"id":1884,"date":"2018-03-27T17:25:08","date_gmt":"2018-03-27T21:25:08","guid":{"rendered":"https:\/\/adclichosting.com\/?p=1884"},"modified":"2021-06-18T15:31:48","modified_gmt":"2021-06-18T19:31:48","slug":"crear-formulario-de-contacto-con-php-y-html-variables-post","status":"publish","type":"post","link":"https:\/\/adclichosting.com\/blog\/crear-formulario-de-contacto-con-php-y-html-variables-post\/","title":{"rendered":"Crear formulario de contacto con PHP y HTML"},"content":{"rendered":"<div class=\"kb-article-title\">\n<p>En ocasiones necesitamos recibir informaci\u00f3n de los clientes que desean contactarnos. Gracias a <a href=\"https:\/\/es.wikipedia.org\/wiki\/PHP\">PHP<\/a> y su m\u00e9todo de envi\u00f3 y recepci\u00f3n de informaci\u00f3n a trav\u00e9s de las Variables POST, esto puede ser posible.<\/p>\n<\/div>\n<div class=\"kb-article-content\">\n<p>Este tipo de transferencia es de gran utilidad ya que nos permite interactuar directamente con el usuario y el proceso es sencillo el cual explicaremos a continuaci\u00f3n. Primeramente, presentamos una primera p\u00e1gina con el formulario cl\u00e1sico a rellenar y las variables son recogidas en una segunda p\u00e1gina que las procesa:<\/p>\n<p><strong>Nota:<\/strong>\u00a0No siempre se definen autom\u00e1ticamente las variables recibidas por el formulario en las p\u00e1ginas web, depende de una variable de configuraci\u00f3n de PHP: register_globals, que tiene que estar activada para que as\u00ed sea. Ver comentarios del art\u00edculo al final de la p\u00e1gina para m\u00e1s informaci\u00f3n.<!--more--><\/p>\n<p><strong>Formulario HTML:<\/strong><\/p>\n<p><a href=\"https:\/\/adclichosting.com\/wp-content\/uploads\/2018\/03\/formulario.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1974 size-full\" src=\"https:\/\/adclichosting.com\/wp-content\/uploads\/2018\/03\/formulario.jpg\" alt=\"\" width=\"372\" height=\"332\" srcset=\"https:\/\/adclichosting.com\/blog\/wp-content\/uploads\/2018\/03\/formulario.jpg 372w, https:\/\/adclichosting.com\/blog\/wp-content\/uploads\/2018\/03\/formulario-300x268.jpg 300w\" sizes=\"auto, (max-width: 372px) 100vw, 372px\" \/><\/a><\/p>\n<p><strong>Archivo PHP para recibir datos del formulario (Variables POST):<\/strong><\/p>\n<p><a href=\"https:\/\/adclichosting.com\/wp-content\/uploads\/2018\/03\/formulario2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1975\" src=\"https:\/\/adclichosting.com\/wp-content\/uploads\/2018\/03\/formulario2.jpg\" alt=\"\" width=\"434\" height=\"289\" srcset=\"https:\/\/adclichosting.com\/blog\/wp-content\/uploads\/2018\/03\/formulario2.jpg 434w, https:\/\/adclichosting.com\/blog\/wp-content\/uploads\/2018\/03\/formulario2-300x200.jpg 300w\" sizes=\"auto, (max-width: 434px) 100vw, 434px\" \/><\/a><\/p>\n<p><strong>$HTTP_POST_VARS<\/strong><\/p>\n<p>Recordamos que es posible recopilar en una variable tipo array el conjunto de variables que han sido enviadas al script por este m\u00e9todo a partir de la variable de sistema $HTTP_POST_VARS.<\/p>\n<p>echo \u00abVariable \\$nombre: \u00bb . $HTTP_POST_VARS[\u00abnombre\u00bb] . \u00ab&lt;br&gt;\\n\u00bb;<\/p>\n<p><strong>Nota:<\/strong>\u00a0Aunque podamos recoger variables con este array asociativo o utilizar directamente las variables que se definen en nuestra p\u00e1gina, resulta m\u00e1s seguro utilizar $HTTP_POST_VARS por dos razones, la primera que as\u00ed nos aseguramos que esa varible viene realmente de un formulario y la segunda, que as\u00ed nuestro c\u00f3digo ser\u00e1 m\u00e1s claro cuando lo volvamos a leer, porque quedar\u00e1 especificado que esa variable estamos recibi\u00e9ndola por un formulario.<\/p>\n<p><strong>$_POST<\/strong>A partir de PHP 4.1.0 se pueden recoger las variables de formulario utilizando tambi\u00e9n el array asociativo $_POST, que es el mismo que $HTTP_POST_VARS, pero m\u00e1s corto de escribir.<\/p>\n<h5><strong>Ejemplo de restricci\u00f3n de acceso por edad<\/strong><\/h5>\n<p>Para continuar aportando ejemplos al uso de formularios vamos a realizar una p\u00e1gina que muestra solicita la edad del visitante y, dependiendo de dicha edad, permita o no visualizar el contenido de la web. A los mayores de 18 a\u00f1os se les permite ver la p\u00e1gina y a los menores no.<\/p>\n<p>El ejemplo es muy sencillo y no valdr\u00eda tal cual est\u00e1 para utilizarlo a modo de una verdadera restricci\u00f3n de acceso. \u00danicamente nos sirve para saber c\u00f3mo obtener datos de un formulario y como tratarlos para realizar una u otra acci\u00f3n, dependiendo de su valor.<\/p>\n<p>La p\u00e1gina del formulario, que hemos llamado edad.php tendr\u00eda esta forma:<\/p>\n<p><span class=\"codigo\">&lt;html&gt;<br \/>\n&lt;head&gt;<br \/>\n&lt;title&gt;Restringir por edad&lt;\/title&gt;<br \/>\n&lt;\/head&gt;<\/span><\/p>\n<p>&lt;body&gt;<\/p>\n<p>&lt;form action=\u00bbedad2.php\u00bb method=\u00bbpost\u00bb&gt;<br \/>\nEscribe tu edad: &lt;input type=\u00bbtext\u00bb name=\u00bbedad\u00bb size=\u00bb2&#8243;&gt;<br \/>\n&lt;input type=\u00bbsubmit\u00bb value=\u00bbEntrar\u00bb&gt;<br \/>\n&lt;\/form&gt;<\/p>\n<p>&lt;\/body&gt;<br \/>\n&lt;\/html&gt;<\/p>\n<p>Esta es una p\u00e1gina sin ning\u00fan c\u00f3digo PHP, simplemente tiene un formulario. Fij\u00e9monos en el action del formulario, que est\u00e1 dirigido hacia una p\u00e1gina llamada edad2.php, que es la que recibir\u00e1 el dato de la edad y mostrar\u00e1 un contenido u otro dependiendo de ese valor. Su c\u00f3digo es el siguiente:<\/p>\n<p><span class=\"codigo\">&lt;html&gt;<br \/>\n&lt;head&gt;<br \/>\n&lt;title&gt;Restringir por edad&lt;\/title&gt;<br \/>\n&lt;\/head&gt;<\/span><\/p>\n<p>&lt;body&gt;<\/p>\n<p>&lt;?<br \/>\n$edad = $_POST[\u00abedad\u00bb];<br \/>\necho \u00abTu edad: $edad&lt;p&gt;\u00bb;<\/p>\n<p>if ($edad &lt; 18) {<br \/>\necho \u00abNo puedes entrar\u00bb;<br \/>\n}else{<br \/>\necho \u00abBienvenido\u00bb;<br \/>\n}<br \/>\n?&gt;<br \/>\n&lt;\/body&gt;<br \/>\n&lt;\/html&gt;<\/p>\n<\/div>\n<h2>Campo oculto en formulario<\/h2>\n<p>&lt;form name=\u00bbform1&#8243; method=\u00bbpost\u00bb action=\u00bb\u00bb&gt;<\/p>\n<p>&lt;input type=\u00bbhidden\u00bb name=\u00bbnombre\u00bb&gt;<\/p>\n<p>&lt;\/form&gt;<\/p>\n<div class=\"kb-article-content\">\n<p>Esperamos que este otro c\u00f3digo tampoco resulte extra\u00f1o. Simplemente se recibe la edad, utilizando el array $_POST. Luego se muestra la edad y se ejecuta una expresi\u00f3n condicional en funci\u00f3n de que la edad sea menor que 18. En caso positivo (edad menor que 18), se muestra un mensaje que informa de que no se deja acceder al p\u00e1gina. En caso negativo (mayor o igual a 18) se muestra un mensaje de bienvenida.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>En ocasiones necesitamos recibir informaci\u00f3n de los clientes que desean contactarnos. Gracias a PHP y su m\u00e9todo de envi\u00f3 y recepci\u00f3n de informaci\u00f3n a trav\u00e9s de las Variables POST, esto&hellip;<\/p>\n","protected":false},"author":2,"featured_media":10141,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,3314],"tags":[],"class_list":["post-1884","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-adclic-hosting","category-sys-admin-y-webmaster"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.0 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Recibir Variables POST - Preguntas Frecuentes. ADCLIC HOSTING<\/title>\n<meta name=\"description\" content=\"Gracias a PHP y su m\u00e9todo de envi\u00f3 y recepci\u00f3n de informaci\u00f3n a trav\u00e9s de las Variables POST, esto puede ser posible. 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