Modern PHP DOM classes help applications parse and save structured documents. Writes a Dom HTMLDocument to a local HTML file. The API is separate from the older DOMDocument class.
What Is Dom\HTMLDocument::saveHtmlFile() Method?
Writes a Dom HTMLDocument to a local HTML file.
Its syntax is:
public Dom\HTMLDocument::saveHtmlFile(string $filename): int|false
The parameters are:
string $filename— The source or destination filesystem path.
Return value: The declared return type is int|false. The result is a byte count or false, not the HTML string; write permissions are required.
Requirements: Requires PHP 8.4 or later with the DOM extension enabled. These examples are intended for local files.
Important: The result is a byte count or false, not the HTML string; write permissions are required.
Example 1: Basic Usage
The basic example focuses on the behavior of Dom\HTMLDocument::saveHtmlFile() Method: writes a Dom HTMLDocument to a local HTML file. Inputs are defined locally or shown as application-controlled paths.
<?php
$document = Dom\HTMLDocument::createFromString("<!doctype html><title>Demo</title>");
$bytesWritten = $document->saveHtmlFile(__DIR__ . "/export.html");
var_dump($bytesWritten !== false);
The displayed value, file content or return status depends on the input and surrounding environment. Results involving local paths, identifiers or generated files are not fixed values.
Example 2: A Different Use Case
This second example illustrates another input or execution condition for Dom\HTMLDocument::saveHtmlFile() Method. Notice the different checks, arguments, or output handling.
<?php
$document = Dom\HTMLDocument::createFromFile(__DIR__ . "/page.html");
$writtenBytes = $document->saveHtmlFile(__DIR__ . "/page-copy.html");
if ($writtenBytes === false) { throw new RuntimeException("Save failed"); }
This variation matters because the result is a byte count or false, not the HTML string; write permissions are required.
Practical Example: Using the Operation in an Application
The following example demonstrates how Dom\HTMLDocument::saveHtmlFile() Method fits into a more complete file or archive workflow, including inputs and appropriate checks.
<?php
$document = Dom\HTMLDocument::createFromString("<!doctype html><html><body><h1>Report</h1></body></html>");
$outputPath = __DIR__ . "/output/report.html";
if (!is_dir(dirname($outputPath))) { throw new RuntimeException("Missing output directory"); }
if ($document->saveHtmlFile($outputPath) === false) { throw new RuntimeException("Write failed"); }
The operation shown is an illustrative script. Adapt the filenames, required permissions, and error handling to your own controlled application environment before running it.
Important Behavior and Edge Cases
- Function behavior: Writes a Dom HTMLDocument to a local HTML file.
- Limitation: The result is a byte count or false, not the HTML string; write permissions are required.
- Availability: Requires PHP 8.4 or later with the DOM extension enabled. These examples are intended for local files.
Comparison With Related Functions
| Function or Method | Difference |
|---|---|
Dom\HTMLDocument::saveHtmlFile() Method | Writes a Dom HTMLDocument to a local HTML file. |
Dom\HTMLDocument::saveHtml() | Returns the HTML serialization as a string instead of writing a file. |
Use Dom\HTMLDocument::saveHtmlFile() Method for the specific behavior described above. The related operation, Dom\HTMLDocument::saveHtml(), serves a different purpose; do not substitute it unless that different behavior is intended.
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Assuming this method is available on every PHP installation. | The result is a byte count or false, not the HTML string; write permissions are required. Check the required PHP version and extension while deploying the example. |
| Treating Dom\HTMLDocument::saveHtml() as an interchangeable replacement for Dom\HTMLDocument::saveHtmlFile() Method. | Returns the HTML serialization as a string instead of writing a file. |
Key Takeaways
- Writes a Dom HTMLDocument to a local HTML file.
- The result is a byte count or false, not the HTML string; write permissions are required.
- Related operation: Dom\HTMLDocument::saveHtml() — Returns the HTML serialization as a string instead of writing a file.
Dom\HTMLDocument::saveHtmlFile() Method is useful when its specific behavior matches your application requirement. Keep paths controlled, check failures, and handle environment-dependent operations deliberately.