SIBERSALDIRI.COM · FOCUSED LESSON
What you will learn
- To explain the relationship between Decision and Reason.
- “Why is the comment that says the same code weak?” To give a reasoned answer to the question.
- Changing the example and comparing expected and observed behavior.
How it works and where the trust boundary lies
The single-line comment is suitable for the short justification, while the block comment is suitable for the contract of the function. Document the input, error behavior, and side effect a function expects. As the code changes, the comment should also be reviewed; Explanation of old behavior may lead to wrong decisions during maintenance. The comment line is not a confidential data storage area.
Worked example
The following passage makes the concept visible. Evaluate samples containing commands or code in your own separate testing environment, not in the production system. Architectural diagrams and policy examples are not executable programs.
<?php
// Tek istekte işlenen kayıt sayısı belleği sınırlamak için kısıtlıdır.
$limit = 50;
echo $limit, PHP_EOL;Expected result and interpretation
Only 50 is written; The comment is not executed and is not added to the output.
Compare the scenarios
| Status | Recommended approach | Why? |
|---|---|---|
| Why is there an upper limit? | Write the reason | Supports maintenance decision |
| Code changed, comment is old | Update together | Creates false assumption |
| There is a password in the comment | Remove and return secret | It may be in the past |
Practice task
Write in one sentence why the upper limit was chosen. Examine if the interpretation is still correct when the value changes.
- Write down the expected outcome and acceptance condition before the action.
- Change a single variable; Record the observation and the medium you used.
- Evaluate the result with the comparison table above. Explain which assumption might be wrong if it does not fit.
Common mistake and how to correct it
Do not leave the password or access key even in the comment; can enter the repository history.
Test your understanding
Why is the comment that says the same code weak?
Answer explained: The code already shows the process; The additional value of the comment is that it explains the rationale for the decision and the assumption to be maintained.
Continue with related lessons
- PHP output operations: echo, print and HTML context
- PHP variables: Type and trust source
- PHP syntax: Difference between parsing and behavior
- PHP operators: Explicit comparison and precedence
Technical reference
The explanation and examples of this course have been re-prepared for the academy. The link below is a technical reference to verify details of the technology or security approach used.
