You can validate that variable values look how they are supposed to by using filter_var in PHP. Filter_var determines if an email address, IP address, Int, Float, etc are formatted how they are supposed to be.
Validation Filters: https://www.php.net/manual/en/filter.filters.validate.php
formValid.html
<html>
<body>
<form action="phpFormValidation.php" method="post">
Name: <input type="text" name="name"><br>
Age: <input type="text" name="age"><br>
Email:<input type="text" name="email"><br>
<input type ="submit">
</form>
</body>
</html>phpFormValidation.php
<?php
$name = $_POST['name'];
$age = $_POST['age'];
$email = $_POST['email'];
$servername = "localhost";
$username = "bob";
$password = "123456";
$db = "classDB";
$conn = new mysqli($servername, $username, $password, $db);
if ($conn->connect_error){
die("Connection failed: ". $conn->connect_error);
}
if (filter_var($email,FILTER_VALIDATE_EMAIL) === FALSE) {
print "Bad Email";
} elseif (filter_var($age,FILTER_VALIDATE_INT) === FALSE) {
print "Bad Age";
} else {
$sql = "insert into emailSignup(name,age,email) values('$name','$age','$email')";
if ($conn->query($sql) === TRUE) {
echo "ADDED: ".$name.", ".$age.", ".$email;
} else {
echo "Error: ".$sql."<br>".$conn->error;
}
}
$conn->close();
?>SQL for emailSignup
create table emailSignup(
id int auto_increment primary key,
name text,
age int,
email text);
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