filters.php

<?php
	// Check for posted data
	// if(filter_has_var(INPUT_POST, 'data')) {
	// 	echo 'Data Found';
	// } else {
	// 	echo 'No Data';
	// }

/*
	if(filter_has_var(INPUT_POST, 'data')) {
		$email = $_POST['data'];

		// Remove illegal chars
		$email = filter_var($email, FILTER_SANITIZE_EMAIL);
		echo $email.'<br>';

		if(filter_var($email, FILTER_VALIDATE_EMAIL)) {
			echo 'Email is valid';
		} else {
			echo 'Email is NOT valid';
		}
	}

	# FILTER_VALIDATE_BOOLEAN
	# FILTER_VALIDATE_EMAIL
	# FILTER_VALIDATE_FLOAT
	# FILTER_VALIDATE_INT
	# FILTER_VALIDATE_IP
	# FILTER_VALIDATE_REGEXP
	# FILTER_VALIDATE_URL
	
	# FILTER_SANITIZE_EMAIL
	# FILTER_SANITIZE_ENCODED
	# FILTER_SANITIZE_NUMBER_FLOAT
	# FILTER_SANITIZE_NUMBER_INT
	# FILTER_SANITIZE_SPECIAL_CHARS
	# FILTER_SANITIZE_STRING
	# FILTER_SANITIZE_URL


	$var = 23;

	if(filter_var($var, FILTER_VALIDATE_INT)) {
		echo $var. ' is a number';
	} else {
		echo $var. ' is NOT a number';
	}

	$var = '<script>alert(1)</script>';
	// echo $var;
	echo filter_var($var, FILTER_SANITIZE_SPECIAL_CHARS);
	// var_dump(filter_var($var, FILTER_SANITIZE_NUMBER_INT));


	$filters = array(
		"data" => FILTER_VALIDATE_EMAIL,
		"data2" => array(
			"filter" => FILTER_VALIDATE_INT,
			"options" => array(
				"min_range" => 1,
				"max_range" => 100
			)
		)
	);

	print_r(filter_input_array(INPUT_POST, $filters));

	*/

	$arr = array(
		"name" => "brad traversy",
		"age" => "35",
		"email" => "brad@gmail.com"
	);

	$filters = array(
		"name" => array(
			"filter" => FILTER_CALLBACK,
			"options" => "ucwords"
		),
		"age" => array(
			"filter" => FILTER_VALIDATE_INT,
			"options" => array(
				"min_range" => 1,
				"max_range" => 120
			)
		),
		"email" => FILTER_VALIDATE_EMAIL
	);

	print_r(filter_var_array($arr, $filters));
?>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
	<input type="text" name="data">
	<input type="text" name="data2">
	<button type="submit">Submit</button>
</form>