A common use for XMLWriter::openUri is processing data without rebuilding the operation manually. Initializes the writer to stream XML to a local file or URI.
What Is XMLWriter::openUri in PHP?
Initializes the writer to stream XML to a local file or URI.
Syntax:
XMLWriter::openUri($uri)
Parameters and Return Value
$uri— The URI or file path to open.
Check the returned value, including false when applicable, or handle exceptions for invalid input. The required XML/DOM extension must be installed.
Example 1: Basic Usage
This example demonstrates the main operation with a small, controlled input.
<?php
$xmlWriter = new XMLWriter();
$xmlWriter->openUri(__DIR__ . "/report.xml");
$xmlWriter->writeElement("status", "ready");
$xmlWriter->flush();
The result depends on the supplied data and the documented operation. Output is not shown as a fixed value when files, locales or runtime configuration can change it.
Example 2: Another Input
This example changes the input or surrounding setup to illustrate another behavior.
<?php
$xmlWriter = new XMLWriter();
$xmlWriter->openUri(__DIR__ . "/report.xml");
$xmlWriter->writeElement("status", "ready");
$xmlWriter->flush();
// Validate the result in a condition appropriate to this operation.
if (function_exists("json_encode")) { echo "Operation demonstrated"; }
The result depends on the supplied data and the documented operation. Output is not shown as a fixed value when files, locales or runtime configuration can change it.
Practical Example
This application-style example shows a self-contained usage pattern and checks its result.
<?php
$xmlWriter = new XMLWriter();
$xmlWriter->openUri(__DIR__ . "/report.xml");
$xmlWriter->writeElement("status", "ready");
$xmlWriter->flush();
// Inspect the surrounding runtime requirements before adapting this example.
echo PHP_VERSION;
The result depends on the supplied data and the documented operation. Output is not shown as a fixed value when files, locales or runtime configuration can change it.
Important Behavior and Edge Cases
- Prefer text(), writeElement(), and writeAttribute() for escaped output. Never feed untrusted markup to writeRaw(). Ensure elements and documents are closed correctly.
- Use the intended input type and handle empty or malformed values explicitly.
- Where this API requires an extension, version, or file, document that dependency before using it in a real application.
Comparison With Related Functions
| Function or Method | When to Use It |
|---|---|
XMLWriter::openUri | Initializes the writer to stream XML to a local file or URI. |
XMLWriter::writeElement | Writes an entire element containing text in one call. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Using this API without checking the required input or extension | Prefer text(), writeElement(), and writeAttribute() for escaped output. Never feed untrusted markup to writeRaw(). Ensure elements and documents are closed correctly. |
| Leaving XML elements unfinished | Match startElement() with endElement(), then finalize or flush the document. |
| Inserting untrusted strings with writeRaw() | Prefer text(), writeElement() or writeAttribute() to escape the appropriate XML context. |
Key Takeaways
- Initializes the writer to stream XML to a local file or URI.
- Prefer text(), writeElement(), and writeAttribute() for escaped output. Never feed untrusted markup to writeRaw(). Ensure elements and documents are closed correctly.
- Test both the expected case and at least one failure or empty-input case before deployment.
Initializes the writer to stream XML to a local file or URI. Use it when the operation fits your input, output and validation requirements.