PHP-Form-Validation/form-require-validate at main · Jakirriaaz/PHP-Form-Validation · GitHub

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//All about form validation html, php

<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>"></form>

<?php
//Validation
//Define variable and set empty values

$name = $email = $gender = $comment = $website = "";

if($_SERVER["REQUEST_METHOD"] == "POST"){
	$name = test_input($_POST["name"]);
	$email = test_input($_POST["email"]);
	$gender = test_input($_POST["gender"]);
	$comment = test_input($_POST["comment"]);
	$website = test_input($_POST["website"]);
}

function test_input($data){
	$data = trim($data);
	$data = stripslashes($data);
	$data = htmlspecialchars($data);
	return $data;
}
?>

<?php
//Required*
//define  variables and set to empty values
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";

if($_POST["REQUEST_METHOD"] == "POST"){
	if(empty($_POST["name"])){
		$nameErr = "Name is required";
	}else {
		$name = test_input($_POST["name"]);
	}
	if(empty($_POST["email"])){
		$emailErr = "Email is required";
	}else{
		$email = test_input("email");
	}
	if(empty($_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 = "You must select one";
	}else{
		$gender = test_input($_POST["name"]);
	}
}
?>

<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">

	Name: <input type="text" name="name">
	<span class="error">*<?php echo $nameErr; ?></span></br>

	Email: <input type="text" name="email">
	<span class="error">*<?php echo $emailErr; ?></span></br>

	Website: <input type="text" name="website">
	<span class="error">*<?php echo $websiteErr;?></span></br>

	Comment: <textarea name="comment" rows="5" cols="40"></textarea></br>

	Gender:
	<input type="radio" name="gender" value="female">Female
	<input type="radio" name="gender" value="male">Male
	<input type="radio" name="gender" value="other">Other
	<span class="error">*<?php echo $genderErr; ?></span></br>

	<input type="submit" name="submit" value="Submit">
</form>

<?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 letter 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 email address is well format
		if(!filter_var($email, FILTER_VALIDATE_EMIL)){
			$emailErr = "Invalid email format";
		}
	}
	if(empty($_POST["website"])){
		$website = "";
	}else{
		$website = test_input($_POST["website"]);
		//check if URL address systax is valid
		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"]);
	}
}
// Completed form

Name: <input type="text" name="name" value=<?php echo $name; ?>">

Email: <input type="text" name="email" value="<?php echo $email; ?>">

Website: <input type="text" name="website" value=<?php echo $website; ?>">

Comment: <textarea name="comment" rows="5" cols="40"<?php echo $comment; ?></textarea>

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