What are the potential drawbacks of learning PHP from outdated books or resources?

Learning PHP from outdated books or resources can lead to learning deprecated or insecure practices that are no longer recommended. This can result in writing code that is not efficient, secure, or compatible with modern PHP versions. To avoid this, it's important to refer to up-to-date documentation and resources to ensure you are learning the latest best practices in PHP programming.

// Example of using the latest PHP documentation to learn about arrays
$fruits = ['apple', 'banana', 'orange'];
foreach($fruits as $fruit) {
  echo $fruit . "<br>";
}