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form validation in php
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<!DOCTYPE HTML> | |
<html> | |
<head> | |
<style> | |
.error {color: #FF0000;} | |
</style> | |
<title>Complete Form Validation</title> | |
</head> | |
<body> | |
<p>Form Validation in PHP</p> | |
<?php | |
// define variables and set to empty values | |
$nameErr = $emailErr = $genderErr = $websiteErr = ""; | |
$name = $email = $gender = $comment = $website = ""; | |
if ($_SERVER["REQUEST_METHOD"] == "POST") | |
{ | |
if (empty($_POST["name"])) | |
{$nameErr = "Name is required";} | |
else | |
{ | |
$name = test_input($_POST["name"]); | |
// check if name only contains letters and whitespace | |
if (!preg_match("/^[a-zA-Z ]*$/",$name)) | |
{ | |
$nameErr = "Only letters and white space allowed"; | |
} | |
} | |
if (empty($_POST["email"])) | |
{$emailErr = "Email is required";} | |
else | |
{ | |
$email = test_input($_POST["email"]); | |
// check if e-mail address syntax is valid | |
if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) | |
{ | |
$emailErr = "Invalid email format"; | |
} | |
} | |
if (empty($_POST["website"])) | |
{$website = "";} | |
else | |
{ | |
$website = test_input($_POST["website"]); | |
// check if URL address syntax is valid (this regular expression also allows dashes in the URL) | |
if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) | |
{ | |
$websiteErr = "Invalid URL"; | |
} | |
} | |
if (empty($_POST["comment"])) | |
{$comment = "";} | |
else | |
{$comment = test_input($_POST["comment"]);} | |
if (empty($_POST["gender"])) | |
{$genderErr = "Gender is required";} | |
else | |
{$gender = test_input($_POST["gender"]);} | |
} | |
function test_input($data) | |
{ | |
$data = trim($data); | |
$data = stripslashes($data); | |
$data = htmlspecialchars($data); | |
return $data; | |
} | |
?> | |
<h2>PHP Form Validation Example</h2> | |
<p><span class="error">* required field.</span></p> | |
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> | |
Name: <input type="text" name="name" value="<?php echo $name;?>"> | |
<span class="error">* <?php echo $nameErr;?></span> | |
<br><br> | |
E-mail: <input type="text" name="email" value="<?php echo $email;?>"> | |
<span class="error">* <?php echo $emailErr;?></span> | |
<br><br> | |
Website: <input type="text" name="website" value="<?php echo $website;?>"> | |
<span class="error"><?php echo $websiteErr;?></span> | |
<br><br> | |
Comment: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea> | |
<br><br> | |
Gender: | |
<input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?> value="female">Female | |
<input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?> value="male">Male | |
<span class="error">* <?php echo $genderErr;?></span> | |
<br><br> | |
<input type="submit" name="submit" value="Submit"> | |
</form> | |
<?php | |
echo "<h2>Your Input:</h2>"; | |
echo $name; | |
echo "<br>"; | |
echo $email; | |
echo "<br>"; | |
echo $website; | |
echo "<br>"; | |
echo $comment; | |
echo "<br>"; | |
echo $gender; | |
?> | |
</body> | |
</html> |
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<!DOCTYPE HTML> | |
<html> | |
<head> | |
<style> | |
.error {color: #FF0000;} | |
</style> | |
<title>PHP Form Validation Example (Required)</title> | |
</head> | |
<body> | |
<?php | |
// define variables and set to empty values | |
$nameErr = $emailErr = $genderErr = $websiteErr = ""; | |
$name = $email = $gender = $comment = $website = ""; | |
if ($_SERVER["REQUEST_METHOD"] == "POST") | |
{ | |
if (empty($_POST["name"])) | |
{$nameErr = "Name is required";} | |
else | |
{$name = test_input($_POST["name"]);} | |
if (empty($_POST["email"])) | |
{$emailErr = "Email is required";} | |
else | |
{$email = test_input($_POST["email"]);} | |
if (empty($_POST["website"])) | |
{$website = "";} | |
else | |
{$website = test_input($_POST["website"]);} | |
if (empty($_POST["comment"])) | |
{$comment = "";} | |
else | |
{$comment = test_input($_POST["comment"]);} | |
if (empty($_POST["gender"])) | |
{$genderErr = "Gender is required";} | |
else | |
{$gender = test_input($_POST["gender"]);} | |
} | |
function test_input($data) | |
{ | |
$data = trim($data); | |
$data = stripslashes($data); | |
$data = htmlspecialchars($data); | |
return $data; | |
} | |
?> | |
<h2>PHP Form Validation Example</h2> | |
<p><span class="error">* required field.</span></p> | |
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> | |
Name: <input type="text" name="name"> | |
<span class="error">* <?php echo $nameErr;?></span> | |
<br><br> | |
E-mail: <input type="text" name="email"> | |
<span class="error">* <?php echo $emailErr;?></span> | |
<br><br> | |
Website: <input type="text" name="website"> | |
<span class="error"><?php echo $websiteErr;?></span> | |
<br><br> | |
Comment: <textarea name="comment" rows="5" cols="40"></textarea> | |
<br><br> | |
Gender: | |
<input type="radio" name="gender" value="female">Female | |
<input type="radio" name="gender" value="male">Male | |
<span class="error">* <?php echo $genderErr;?></span> | |
<br><br> | |
<input type="submit" name="submit" value="Submit"> | |
</form> | |
<?php | |
echo "<h2>Your Input:</h2>"; | |
echo $name; | |
echo "<br>"; | |
echo $email; | |
echo "<br>"; | |
echo $website; | |
echo "<br>"; | |
echo $comment; | |
echo "<br>"; | |
echo $gender; | |
?> | |
</body> | |
</html> |
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<!DOCTYPE HTML> | |
<html> | |
<head> | |
<style> | |
.error {color: #FF0000;} | |
</style> | |
<title> | |
PHP Forms - Validate E-mail and URL | |
</title> | |
</head> | |
<body> | |
<?php | |
// define variables and set to empty values | |
$nameErr = $emailErr = $genderErr = $websiteErr = ""; | |
$name = $email = $gender = $comment = $website = ""; | |
if ($_SERVER["REQUEST_METHOD"] == "POST") | |
{ | |
if (empty($_POST["name"])) | |
{$nameErr = "Name is required";} | |
else | |
{ | |
$name = test_input($_POST["name"]); | |
// check if name only contains letters and whitespace | |
if (!preg_match("/^[a-zA-Z ]*$/",$name)) | |
{ | |
$nameErr = "Only letters and white space allowed"; | |
} | |
} | |
if (empty($_POST["email"])) | |
{$emailErr = "Email is required";} | |
else | |
{ | |
$email = test_input($_POST["email"]); | |
// check if e-mail address syntax is valid | |
if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) | |
{ | |
$emailErr = "Invalid email format"; | |
} | |
} | |
if (empty($_POST["website"])) | |
{$website = "";} | |
else | |
{ | |
$website = test_input($_POST["website"]); | |
// check if URL address syntax is valid (this regular expression also allows dashes in the URL) | |
if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) | |
{ | |
$websiteErr = "Invalid URL"; | |
} | |
} | |
if (empty($_POST["comment"])) | |
{$comment = "";} | |
else | |
{$comment = test_input($_POST["comment"]);} | |
if (empty($_POST["gender"])) | |
{$genderErr = "Gender is required";} | |
else | |
{$gender = test_input($_POST["gender"]);} | |
} | |
function test_input($data) | |
{ | |
$data = trim($data); | |
$data = stripslashes($data); | |
$data = htmlspecialchars($data); | |
return $data; | |
} | |
?> | |
<h2>PHP Form Validation Example</h2> | |
<p><span class="error">* required field.</span></p> | |
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> | |
Name: <input type="text" name="name"> | |
<span class="error">* <?php echo $nameErr;?></span> | |
<br><br> | |
E-mail: <input type="text" name="email"> | |
<span class="error">* <?php echo $emailErr;?></span> | |
<br><br> | |
Website: <input type="text" name="website"> | |
<span class="error"><?php echo $websiteErr;?></span> | |
<br><br> | |
Comment: <textarea name="comment" rows="5" cols="40"></textarea> | |
<br><br> | |
Gender: | |
<input type="radio" name="gender" value="female">Female | |
<input type="radio" name="gender" value="male">Male | |
<span class="error">* <?php echo $genderErr;?></span> | |
<br><br> | |
<input type="submit" name="submit" value="Submit"> | |
</form> | |
<?php | |
echo "<h2>Your Input:</h2>"; | |
echo $name; | |
echo "<br>"; | |
echo $email; | |
echo "<br>"; | |
echo $website; | |
echo "<br>"; | |
echo $comment; | |
echo "<br>"; | |
echo $gender; | |
?> | |
</body> | |
</html> |
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<!DOCTYPE HTML> | |
<head> | |
<title>PHP Form Validation Example (Basic)</title> | |
</head> | |
<html> | |
<head> | |
</head> | |
<body> | |
<?php | |
// define variables and set to empty values | |
$name = $email = $gender = $comment = $website = ""; | |
if ($_SERVER["REQUEST_METHOD"] == "POST") | |
{ | |
$name = test_input($_POST["name"]); | |
$email = test_input($_POST["email"]); | |
$website = test_input($_POST["website"]); | |
$comment = test_input($_POST["comment"]); | |
$gender = test_input($_POST["gender"]); | |
} | |
function test_input($data) | |
{ | |
$data = trim($data); | |
$data = stripslashes($data); | |
$data = htmlspecialchars($data); | |
return $data; | |
} | |
?> | |
<h2>PHP Form Validation Example</h2> | |
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> | |
Name: <input type="text" name="name"> | |
<br><br> | |
E-mail: <input type="text" name="email"> | |
<br><br> | |
Website: <input type="text" name="website"> | |
<br><br> | |
Comment: <textarea name="comment" rows="5" cols="40"></textarea> | |
<br><br> | |
Gender: | |
<input type="radio" name="gender" value="female">Female | |
<input type="radio" name="gender" value="male">Male | |
<br><br> | |
<input type="submit" name="submit" value="Submit"> | |
</form> | |
<?php | |
echo "<h2>Your Input:</h2>"; | |
echo $name; | |
echo "<br>"; | |
echo $email; | |
echo "<br>"; | |
echo $website; | |
echo "<br>"; | |
echo $comment; | |
echo "<br>"; | |
echo $gender; | |
?> | |
</body> | |
</html> |
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<!Doctype html> | |
<html> | |
<head> | |
<title>preg_match() in PHP<title> | |
</head> | |
<body> | |
<!-- | |
The preg_match() function searches a string for pattern, returning true if the pattern exists, and false otherwise. | |
PHP - Validate Name | |
The code below shows a simple way to check if the name field only contains letters and whitespace. If the value of the name field is not valid, then store an error message: | |
!--> | |
<?php | |
$name = test_input($_POST["name"]); | |
if (!preg_match("/^[a-zA-Z ]*$/",$name)) | |
{ | |
$nameErr = "Only letters and white space allowed"; | |
} | |
?> | |
<!-- | |
PHP - Validate E-mail | |
The code below shows a simple way to check if an e-mail address syntax is valid. If the e-mail address syntax is not valid, then store an error message: | |
!--> | |
<?php | |
$email = test_input($_POST["email"]); | |
if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) | |
{ | |
$emailErr = "Invalid email format"; | |
} | |
?> | |
<!-- | |
PHP - Validate URL | |
The code below shows a way to check if a URL address syntax is valid (this regular expression also allows dashes in the URL). If the URL address syntax is not valid, then store an error message: | |
!--> | |
<?php | |
$website = test_input($_POST["website"]); | |
if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) | |
{ | |
$websiteErr = "Invalid URL"; | |
} | |
?> | |
<!-- | |
PHP - Validate Name, E-mail, and URL | |
Now, the script looks like this: | |
!--> | |
<?php | |
// define variables and set to empty values | |
$nameErr = $emailErr = $genderErr = $websiteErr = ""; | |
$name = $email = $gender = $comment = $website = ""; | |
if ($_SERVER["REQUEST_METHOD"] == "POST") | |
{ | |
if (empty($_POST["name"])) | |
{$nameErr = "Name is required";} | |
else | |
{ | |
$name = test_input($_POST["name"]); | |
// check if name only contains letters and whitespace | |
if (!preg_match("/^[a-zA-Z ]*$/",$name)) | |
{ | |
$nameErr = "Only letters and white space allowed"; | |
} | |
} | |
if (empty($_POST["email"])) | |
{$emailErr = "Email is required";} | |
else | |
{ | |
$email = test_input($_POST["email"]); | |
// check if e-mail address syntax is valid | |
if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) | |
{ | |
$emailErr = "Invalid email format"; | |
} | |
} | |
if (empty($_POST["website"])) | |
{$website = "";} | |
else | |
{ | |
$website = test_input($_POST["website"]); | |
// check if URL address syntax is valid (this regular expression also allows dashes in the URL) | |
if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) | |
{ | |
$websiteErr = "Invalid URL"; | |
} | |
} | |
if (empty($_POST["comment"])) | |
{$comment = "";} | |
else | |
{$comment = test_input($_POST["comment"]);} | |
if (empty($_POST["gender"])) | |
{$genderErr = "Gender is required";} | |
else | |
{$gender = test_input($_POST["gender"]);} | |
} | |
?> | |
</body> | |
</html> |
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