Handle failures and local files deliberately.

LESSON OBJECTIVE

What you will be able to do

Handle known failures, paths, writes, and sensitive values without hiding errors or exposing secrets.

Catch only what you can explain

Do not wrap the whole application in a silent catch. Catch a known exception, print a useful message, and preserve a non-zero exit.

$path = __DIR__ . '/../storage/result.txt';
file_put_contents($path, $value, LOCK_EX);

Use paths relative to the project

Use __DIR__ and explicit storage directories. Reject traversal when a user influences a filename, and write atomically when data matters.

Never store plain passwords

password_hash creates a one-way verifier. Encryption is reversible; password storage should not be.