What best practices should be followed when inheriting and maintaining PHP code written by a colleague with limited experience in PHP?

When inheriting and maintaining PHP code written by a colleague with limited experience, it is important to thoroughly review the code for any potential issues or vulnerabilities. It is also recommended to refactor the code to follow best practices such as using proper variable naming, commenting, and organizing code into functions or classes. Additionally, consider implementing coding standards and guidelines to ensure consistency and readability. 

// Example of refactoring code for better readability and maintainability

// Original code
$var = 10;
if ($var > 5) {
    echo "Variable is greater than 5";
} else {
    echo "Variable is less than or equal to 5";
}

// Refactored code
$number = 10;
if ($number > 5) {
    echo "Number is greater than 5";
} else {
    echo "Number is less than or equal to 5";
}

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