How can outdated PHP code from older sources impact the functionality of a web application?

Outdated PHP code from older sources can impact the functionality of a web application by causing compatibility issues with newer PHP versions, security vulnerabilities, and deprecated functions that may no longer work as intended. To solve this issue, it is recommended to update the PHP code to adhere to current best practices and standards. 

// Example of updating outdated PHP code to improve functionality
// Before: Using deprecated mysql_connect function
$connection = mysql_connect('localhost', 'username', 'password');

// After: Using mysqli_connect function
$connection = mysqli_connect('localhost', 'username', 'password');

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Outdated PHP code older sources impact functionality web application

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