{"id":758,"date":"2014-05-26T03:03:32","date_gmt":"2014-05-26T07:03:32","guid":{"rendered":"http:\/\/www.searchenginegenie.com\/programming-blog\/?p=758"},"modified":"2014-05-26T03:11:56","modified_gmt":"2014-05-26T07:11:56","slug":"php-form-validation","status":"publish","type":"post","link":"https:\/\/www.searchenginegenie.com\/programming-blog\/php-form-validation\/","title":{"rendered":"PHP Form Validation"},"content":{"rendered":"

<?php
\n\/\/ define variables and set to empty values
\n$nameError = $emailError= $genderError = $websiteError = “”;
\n$name = $email = $gender = $comment = $website = “”;<\/span><\/p>\n

if ($_SERVER[“REQUEST_METHOD”] == “POST”) {
\nif (empty($_POST[“name”])) {
\n$nameError = “Name is required”;
\n} else {
\n$name = test_input($_POST[“name”]);
\n\/\/ check if name only contains letters and whitespace
\nif (!preg_match(“\/^[a-zA-Z ]*$\/”,$name)) {
\n$nameError = “Only letters and white space allowed”;
\n}
\n}<\/p>\n

if (empty($_POST[“email”])) {
\n$emailError = “Email is required”;
\n} else {
\n$email = test_input($_POST[“email”]);
\n\/\/ check if e-mail address syntax is valid
\nif (!preg_match(“\/([\\w\\-]+\\@[\\w\\-]+\\.[\\w\\-]+)\/”,$email)) {
\n$emailError = “Invalid email format”;
\n}
\n}<\/p>\n

if (empty($_POST[“website”])) {
\n$website = “”;
\n} else {
\n$website = test_input($_POST[“website”]);
\n\/\/ check if URL address syntax is valid (this regular expression also allows dashes in the URL)
\nif (!preg_match(“\/\\b(?:(?:https?|ftp):\\\/\\\/|www\\.)[-a-z0-9+&@#\\\/%?=~_|!:,.;]*[-a-z0-9+&@#\\\/%=~_|]\/i”,$website)) {
\n$websiteError = “Invalid URL”;
\n}
\n}<\/p>\n

if (empty($_POST[“comment”])) {
\n$comment = “”;
\n} else {
\n$comment = test_input($_POST[“comment”]);
\n}<\/p>\n

if (empty($_POST[“gender”])) {
\n$genderError = “Gender is required”;
\n} else {
\n$gender = test_input($_POST[“gender”]);
\n}
\n}<\/p>\n

function test_input($data) {
\n$data = trim($data);
\n$data = stripslashes($data);
\n$data = htmlspecialchars($data);
\nreturn $data;
\n}
\n?>

<h2>PHP Form Validation<\/h2><\/span>
<p><span class=”error”>* required field.<\/span><\/p><\/span>
<form method=”post” action=”<\/span><?php echo htmlspecialchars($_SERVER[“PHP_SELF”]);?><\/span>“>\u00a0<\/span>
\u00a0\u00a0 Name: <input type=”text” name=”name”><\/span>
\u00a0\u00a0 <span class=”error”>*\u00a0<\/span><?php echo $nameError;?><\/span><\/span><\/span>
\u00a0\u00a0 <br><br><\/span>
\u00a0\u00a0 E-mail: <input type=”text” name=”email”><\/span>
\u00a0\u00a0 <span class=”error”>*\u00a0<\/span><?php echo $emailError;?><\/span><\/span><\/span>
\u00a0\u00a0 <br><br><\/span>
\u00a0\u00a0 Website: <input type=”text” name=”website”><\/span>
\u00a0\u00a0 <span class=”error”><\/span><?php echo $websiteError;?><\/span><\/span><\/span>
\u00a0\u00a0 <br><br><\/span>
\u00a0\u00a0 Comment: <textarea name=”comment” rows=”5″ cols=”40″><\/textarea><\/span>
\u00a0\u00a0 <br><br><\/span>
\u00a0\u00a0 Gender:<\/span>
\u00a0\u00a0 <input type=”radio” name=”gender” value=”female”>Female<\/span>
\u00a0\u00a0 <input type=”radio” name=”gender” value=”male”>Male<\/span>
\u00a0\u00a0 <span class=”error”>*\u00a0<\/span><?php echo $genderError;?><\/span><\/span><\/span>
\u00a0\u00a0 <br><br><\/span>
\u00a0\u00a0 <input type=”submit” name=”submit” value=”Submit”>\u00a0<\/span>
<\/form><\/span>

<?php
\necho “<h2>Your Input:<\/h2>”;
\necho $name;
\necho “<br>”;
\necho $email;
\necho “<br>”;
\necho $website;
\necho “<br>”;
\necho $comment;
\necho “<br>”;
\necho $gender;
\n?><\/span>

<\/body><\/span>
<\/html><\/span><\/p>\n

\n

 <\/p>\n

PHP Form Validation<\/h2>\n

* required field.<\/span><\/p>\n

Name:
\n* <\/span>
\nE-mail:
\n* <\/span>
\nWebsite: <\/p>\n

Comment: