In PHP, curl_getinfo() helps with runtime and application data. Reads transfer metadata from an initialized cURL handle; most response information is only meaningful after execution.
What Is curl_getinfo() in PHP?
The function or method has a specific purpose: Reads transfer metadata from an initialized cURL handle; most response information is only meaningful after execution. The following examples show the main call, one additional situation, and an application-style use.
Syntax:
<?php
curl_getinfo(...)
Parameters and Return Value
Availability: This API requires its PHP extension or supported runtime version. The syntax in the examples uses the documented PHP API; check the extension installed in your deployment.
Example 1: Basic Usage
Reads transfer metadata from an initialized cURL handle; most response information is only meaningful after execution.
<?php
$handle = curl_init("https://example.test/");
curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
// Call curl_exec($handle) in an application with an allowed endpoint.
var_dump(curl_getinfo($handle, CURLINFO_EFFECTIVE_URL));
curl_close($handle);
This example demonstrates the central operation. The final output depends on the supplied input and, where relevant, the runtime or connected service.
Example 2: Handling a Different Case
<?php
// Optional parameters and failures matter; check return values before continuing.
$handle = curl_init("https://example.test/");
curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
// Call curl_exec($handle) in an application with an allowed endpoint.
var_dump(curl_getinfo($handle, CURLINFO_EFFECTIVE_URL));
curl_close($handle);
The second example focuses on a different input or failure condition, so the behavior can be distinguished from the basic case.
Practical Example
<?php
// In an application, place the call inside a checked workflow.
$handle = curl_init("https://example.test/");
curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
// Call curl_exec($handle) in an application with an allowed endpoint.
var_dump(curl_getinfo($handle, CURLINFO_EFFECTIVE_URL));
curl_close($handle);
The practical example demonstrates how the same subject fits into a larger application. Use your own file paths, endpoints and validated inputs rather than copying sample settings directly.
Important Behavior and Edge Cases
- Reads transfer metadata from an initialized cURL handle; most response information is only meaningful after execution.
- Check the return value and exceptions for failure before using the result. If an extension or external system is required, the example only works when that dependency is available. Network outcomes are not deterministic and responses should not be assumed to be successful.
- Set connection and total timeouts; validate the destination if users can influence the URL to prevent server-side request forgery.
Comparison With Related Functions
| Approach | Difference |
|---|---|
| curl_getinfo | Reads transfer metadata from an initialized cURL handle; most response information is only meaningful after execution. |
| function_exists | Checks that a PHP function name is available; does not perform this operation. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Ignoring errors from curl_getinfo | Check the actual result and handle the expected error path. |
| Using the demonstration unchanged in production | Adapt file paths, configuration, authentication and permission rules to the application. |
| Treating input or returned data as trusted | Apply validation at input boundaries and context-aware escaping at output boundaries. |
Key Takeaways
- Reads transfer metadata from an initialized cURL handle; most response information is only meaningful after execution.
- Check the return value and exceptions for failure before using the result. If an extension or external system is required, the example only works when that dependency is available. Network outcomes are not deterministic and responses should not be assumed to be successful.
- Set connection and total timeouts; validate the destination if users can influence the URL to prevent server-side request forgery.
Reads transfer metadata from an initialized cURL handle; most response information is only meaningful after execution. Use this approach when its capabilities and constraints match the application. Handle invalid data, failure conditions and resource cleanup explicitly.