A return value such as null can describe an expected missing result, whereas an exception reports an exceptional failure.
The examples below begin with the core behavior, then move to an application-oriented use.
How PHP Exceptions vs Error Return Values Works
A return value such as null can describe an expected missing result, whereas an exception reports an exceptional failure.
Example 1: Basic Usage
This example uses a small input to make the main behavior visible.
<?php
function searchProduct(int $identifier): ?string { return $identifier === 1 ? "Pen" : null; }
var_dump(searchProduct(2));Output:
NULLA return value such as null can describe an expected missing result, whereas an exception reports an exceptional failure.
Example 2: A Different Input
A different set of values shows the same operation in another situation.
<?php
function parsePrice(string $input): int { if (!ctype_digit($input)) { throw new InvalidArgumentException("Invalid number"); } return (int) $input; }
echo parsePrice("25");Output:
25Do not encode failures with ambiguous falsey values when false or zero could be valid results.
Practical Example: Applying the Feature
This example shows an application-style use of the feature, with its surrounding setup visible.
<?php
function findEmail(int $identifier): ?string { return $identifier === 7 ? "[email protected]" : null; }
$email = findEmail(8);
echo $email ?? "No record";Output:
No recordThe code is shown for learning. Adjust the class names, inputs and error handling to suit your application.
Important Behavior and Edge Cases
- Do not encode failures with ambiguous falsey values when false or zero could be valid results.
- A return value such as null can describe an expected missing result, whereas an exception reports an exceptional failure.
- Observe differences in empty inputs, invalid states and optional extension availability where relevant.
Comparison With Related Approaches
| Approach | Important Difference |
|---|---|
PHP Exceptions vs Error Return Values | A return value such as null can describe an expected missing result, whereas an exception reports an exceptional failure. |
| Alternative approach | Use nullable or result-like returns for ordinary absence and exceptions when normal execution cannot continue. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
Ignoring the documented state or precondition of PHP Exceptions vs Error Return Values | Do not encode failures with ambiguous falsey values when false or zero could be valid results. |
| Expecting a different type of result | Read the declared return type and distinguish returned values from changes to the source object. |
| Assuming a related API works identically | Use nullable or result-like returns for ordinary absence and exceptions when normal execution cannot continue. |
Key Takeaways
- A return value such as null can describe an expected missing result, whereas an exception reports an exceptional failure.
- Do not encode failures with ambiguous falsey values when false or zero could be valid results.
- Use the example that matches the values, runtime version and dependencies in your application.
PHP Exceptions vs Error Return Values is useful when its behavior matches the data structure and lifecycle of your PHP application. Choose it with a clear understanding of its preconditions and returned values.