In PHP, stream_get_meta_data() is useful when your application needs a specific operation rather than manually reproducing it. Returns metadata about an open stream, such as timed_out, blocked and wrapper_type.
Stream functions work with PHP stream resources, wrappers, contexts or custom filters. Not every wrapper supports every operation.
What Is stream_get_meta_data() in PHP?
Returns metadata about an open stream, such as timed_out, blocked and wrapper_type.
Signature:
stream_get_meta_data($stream): arrayParameters:
$stream— An already opened stream resource, not a filesystem path string.
Return value: array.
Example 1: Basic Usage
This first example shows the method or function in a minimal context. For environment-dependent operations, adapt the required path, stream or connection before running it.
<?php
$stream = fopen("php://temp", "w+");
fwrite($stream, "alpha\nbeta\n");
rewind($stream);
$metadata = stream_get_meta_data($stream);
fclose($stream);
The important operation is stream_get_meta_data(). Returns metadata about an open stream, such as timed_out, blocked and wrapper_type.
Example 2: Another Input or Scenario
The next example changes the input or surrounding context to show how the operation behaves in a second situation.
<?php
$stream = fopen("php://temp", "w+");
fwrite($stream, "gamma\ndelta\n");
rewind($stream);
$metadata = stream_get_meta_data($stream);
fclose($stream);
Compare the inputs and the handling of the return value with the first example. Avoid assuming that filesystem paths, resource states or binary bytes are interchangeable.
Practical Example: Applying the Operation
This example illustrates how the operation fits into a small application workflow. Paths, streams and secrets must be created or provided securely by the calling application.
<?php
$stream = fopen("php://temp", "w+");
fwrite($stream, "alpha\nbeta\n");
rewind($stream);
$metadata = stream_get_meta_data($stream);
// Confirm the return value before using the result.
fclose($stream);
Practical note: Returns metadata about an open stream, such as timed_out, blocked and wrapper_type.
Important Behavior and Edge Cases
- Returns metadata about an open stream, such as timed_out, blocked and wrapper_type.
- Check failure values and exceptions; do not assume every environment supports the same stream wrapper, extension or filesystem capability.
- When handling paths, streams or external input, validate inputs before using results and release resources after use.
Comparison With Related Functions
| Function or Method | Behavior |
|---|---|
stream_get_meta_data() | performs returns metadata about an open stream, such as timed_out, blocked and wrapper_type. |
stream_get_meta_data() | reads metadata about an already opened stream instead. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
Assuming stream_get_meta_data() can be used without its required setup | Provide the correct file, stream, state, key or object before calling it; Returns metadata about an open stream, such as timed_out, blocked and wrapper_type. |
| Assuming a resource result is always successful | Check false returns, actual byte counts, and resource state before using the result. |
| Confusing local and remote stream behavior | Read the wrapper capabilities and handle unsupported operations explicitly. |
Key Takeaways
stream_get_meta_data()returns metadata about an open stream, such as timed_out, blocked and wrapper_type.- Use appropriate input types and verify results before continuing.
- Prefer specialized, safer APIs when the operation concerns untrusted input, encryption or network traffic.
In summary: Returns metadata about an open stream, such as timed_out, blocked and wrapper_type. Build in error handling and use this function where its specific behavior matches the application requirements.