What are the methods of data filtering and validation in PHP7.0?

PHP is a programming language widely used in web development and is used for important data processing, such as form data validation and user input filtering. In PHP 7.0, there are many different methods for filtering and validating input data. In this article, we will explore some of the main methods.

1. filter_var() function

The filter_var() function is a basic function used to filter and verify data in PHP7.0. This function allows the developer to specify the filter type and take the variable to be verified as input to ensure that it meets some conditions specified by the developer. For example, developers can use this function to ensure that an email address is formatted correctly, or that an entered value is within a specific range.

1. Email address verification

The following code snippet shows how to use filter_var() to verify that the email address is in the correct format:

$email = "test@example.com";
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
  echo("$email is not a valid email address");
} else {
  echo("$email is a valid email address");
}

2. Numeric range verification

The following code snippet shows how to use filter_var() to verify whether the value is within the specified range:

$age = 25;
if(!filter_var($age, FILTER_VALIDATE_INT, array("options"=>
    array("min_range"=>18, "max_range"=>60)))) {
  echo("Age is not valid");
} else {
  echo("Age is valid");
}

2. Sanitize Filters

In addition to verification In addition to input data, filters allow developers to clean or sanitize the data to prevent it from containing harmful code. The following filters can be used to sanitize data:

1. FILTER_SANITIZE_STRING: sanitize strings, remove tags and encodings from special characters
2. FILTER_SANITIZE_EMAIL: sanitize emails, remove except letters , numbers, and all characters except !#$%&'* -/=?^_`{|}~@.[].
3. FILTER_SANITIZE_NUMBER_INT: Sanitize integers, removing all characters from the string except numbers and - symbols.
4. FILTER_SANITIZE_NUMBER_FLOAT: Sanitize floating point numbers and remove all characters from the string except numbers, , -, . and e and E (signs of scientific notation).

The following code shows how to use FILTER_SANITIZE_STRING to sanitize data

$name = "<h1>John Doe</h1>";
$name = filter_var($name, FILTER_SANITIZE_STRING);
echo $name;

This code snippet will remove the HTML tags contained in the input data and only output the characters "John Doe".

3. Form verification

Web forms are a very common method in web development, so developers need a way to quickly verify whether the data submitted by the form is correct. Here are several form validation methods:

1. Verify email address

$email = test@example.com;
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
  $emailErr = "Invalid email format";
}

2. Verify URL

$url = "http://www.example.com";
if (!filter_var($url, FILTER_VALIDATE_URL)) {
  $urlErr = "Invalid URL";
}

3. Verify Integer

$age = $_POST["age"];
if (!filter_var($age, FILTER_VALIDATE_INT)) {
  $ageErr = "Age must be a number";
}

Summary

The filters and validation methods provided in PHP7.0 are very practical, allowing developers to validate their data in a simple and fast way. Whether writing forms, processing input, or sanitizing data, these methods can ensure the accuracy and security of the data.

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