Restores a php.ini configuration directive to its original local configuration value. This guide demonstrates its use in PHP code and explains when the result or side effect needs extra checks.
What It Does
Restores a php.ini configuration directive to its original local configuration value.
Syntax and Parameters
The examples below show a real call to ini_restore with suitable arguments. Read the function call in context: its connection, handle, input data or other prerequisites are created before use.
Requirements: standard PHP runtime with the named function available.
Example 1: Core Behavior
Some directives cannot be changed at runtime.
<?php
ini_set("display_errors", "0");
ini_restore("display_errors");
echo ini_get("display_errors");Observe the returned value or changed resource state. A successful function call can still require additional checks before a higher-level operation is considered successful.
Example 2: Alternative or Failure Case
Some directives cannot be changed at runtime.
<?php
ini_set("log_errors", "1");
ini_restore("log_errors");
echo ini_get("log_errors");Compare the different inputs, environment assumptions or result checks. Do not use a transport-level success value as proof that all business-level requirements were met.
Practical Example: Applying the Rule
Some directives cannot be changed at runtime.
<?php
ini_set("default_charset", "UTF-8");
ini_restore("default_charset");
echo ini_get("default_charset");In an application, convert low-level failures into controlled responses and log only non-sensitive diagnostic context.
Important Behavior and Edge Cases
Not all directives are mutable at runtime; restoring does not override administrator-wide restrictions.
Comparison with Related Functions or Patterns
| Approach | When it differs |
|---|---|
| ini_restore | Restores a php.ini configuration directive to its original local configuration value. |
| Related API or pattern | ini_set changes a permitted directive during a request. |
Common Beginner Mistakes
| Mistake | Correct approach |
|---|---|
| Assuming every INI directive is changeable at runtime | Not all directives are mutable at runtime; restoring does not override administrator-wide restrictions. |
| Substituting a related API without checking its semantics | ini_set changes a permitted directive during a request. |
Key Takeaways
- Restores a php.ini configuration directive to its original local configuration value.
- Not all directives are mutable at runtime; restoring does not override administrator-wide restrictions.
- ini_set changes a permitted directive during a request.
Select this API or pattern based on its documented behavior and the trust boundaries in your own application, and test all external integrations against their actual deployments.