<!DOCTYPE HTML>
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body>
<?php
function myfilter_input($data) {
$data = trim($data);
$data = stripslashes($data);
//$data = htmlspecialchars($data);
$data = htmlspecialchars($data, ENT_QUOTES, 'UTF-8');
return $data;
}
// 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 { $name = myfilter_input($_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 {
$email = myfilter_input($_POST["email"]);
// check if e-mail address is well-formed
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) { $emailErr = "Invalid email format"; }
}
if (empty($_POST["website"])) { $website = "";
} else { $website = myfilter_input($_POST["website"]);
//check if URL address syntax is valid (this reg.expr. also allows dashes in 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 { $comment = myfilter_input($_POST["comment"]); }
if (empty($_POST["gender"])) { $genderErr = "Gender is required";
} else { $gender = myfilter_input($_POST["gender"]); }
}
?>
<h2>PHP Form Validation Example</h2>
<p><span class="error">* required field</span></p>
<form method="post" action="<?=htmlspecialchars($_SERVER["PHP_SELF"])?>">
Name: <input type="text" name="name" value="<?=$name?>">
<span class="error">* <?=$nameErr?></span>
<br><br>E-mail: <input type="text" name="email" value="<?=$email?>">
<span class="error">* <?=$emailErr?></span>
<br><br>Website: <input type="text" name="website" value="<?=$website?>">
<span class="error"><?=$websiteErr?></span>
<br><br>Comment: <textarea
name="comment" rows="5" cols="40"><?=$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) && $gender=="male") echo "checked"; ?> value="male">Male
<input type="radio" name="gender" <?php
if (isset($gender) && $gender=="other") echo "checked"; ?> value="other">Other
<span class="error">* <?=$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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