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Yes—you can create a dynamic Gutenberg block without a JavaScript registration file. Register the block in PHP during init, set supports => array( 'autoRegister' => true ), and provide a render_callback (or a PHP template through block.json). WordPress stores the block comment and attributes, then generates the front-end HTML on the server whenever the post is rendered.
This approach is best for server-driven output, existing PHP templates, and data that must stay current. It is less suitable for blocks that need rich, highly interactive editing controls.
What a PHP-only Gutenberg block does
A PHP-only block is registered with WordPress on the server and rendered by PHP. There is no JavaScript file whose primary job is to call registerBlockType(). The block’s name, attributes, supports, and renderer are declared in PHP (or in a block.json file registered from PHP).
For a dynamic block, the editor does not need to save generated front-end markup. WordPress can save the block delimiter comment and its attributes, then invoke the server renderer each time the post is displayed. If a database value, template, or business rule changes, the output reflects that change without rewriting every post that contains the block.
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When this pattern is a good fit
- Markup is primarily produced by PHP and changes with server-side data.
- You already have a PHP template or rendering function that should be reused.
- The editing interface can rely on core block controls and stored attributes rather than a custom React application.
- You want a small plugin with no client-side build step for block registration.
When to choose a JavaScript-assisted block instead
Use a client-side editor implementation when authors need complex controls, immediate client-side previews, drag-and-drop interactions, or substantial editor-only behavior. Official WordPress guidance distinguishes faster client-side manipulation from server rendering that is valuable when existing PHP logic is central.
Create the plugin and register the block
Put the block in a plugin rather than a theme when it should remain available if the site changes themes. Create a directory such as wp-content/plugins/php-only-notice/ and add a main PHP file with a valid plugin header.
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- Create
wp-content/plugins/php-only-notice/php-only-notice.php. - Activate the plugin from Plugins in the WordPress administration area.
- Register the block from a function attached to
init. Registration must happen before the editor or front end tries to use the block.
The following complete example registers a block named my-plugin/notice. The namespace should identify your plugin and the block name should be unique on the site.
<?php
/**
* Plugin Name: PHP Only Notice Block
*/
function my_plugin_register_notice_block() {
register_block_type(
'my-plugin/notice',
array(
'api_version' => 3,
'attributes' => array(
'message' => array(
'type' => 'string',
'default' => 'Hello from PHP',
),
),
'supports' => array(
'autoRegister' => true,
'color' => array(
'background' => true,
'text' => true,
),
),
'render_callback' => 'my_plugin_render_notice_block',
)
);
}
add_action( 'init', 'my_plugin_register_notice_block' );
function my_plugin_render_notice_block( $attributes, $content = '', $block = null ) {
$message = isset( $attributes['message'] )
? $attributes['message']
: 'Hello from PHP';
$wrapper_attributes = get_block_wrapper_attributes();
return sprintf(
'<div %1$s>%2$s</div>',
$wrapper_attributes,
esc_html( $message )
);
}What each registration setting controls
api_version => 3declares the block API version used by the registration.attributesdefines the data stored with each block instance. Here,messageis a string with a default value.supports.autoRegistertells WordPress that the block can be auto-registered for editor use from its server registration.supports.colorenables core text and background color support. These supports can add classes or inline styles to the wrapper.render_callbacknames the PHP function that returns the block’s HTML.
register_block_type() returns a WP_Block_Type object when registration succeeds and false when it fails. During development, checking that return value or enabling WordPress debugging can expose a malformed name or registration array.
Write a safe render callback
The callback receives the block attributes, any saved inner content, and the current block instance. The callback must return the complete HTML string that should appear on the front end.
Escape values at output time
In the example, esc_html() converts the user-supplied message into text-safe HTML. Do not concatenate raw attribute values into markup. Choose an escaping function for the context: text nodes need HTML escaping, an attribute value needs attribute escaping, and a URL needs URL validation and escaping.
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Use the standard wrapper helper
get_block_wrapper_attributes() produces the wrapper attributes expected by block supports and by WordPress’s block styling system. If you enable color, spacing, typography, or other supports later, calling this helper allows those features to contribute the appropriate classes and attributes.
Handle missing or older attributes
Posts can contain an older version of a block, or an attribute can be absent after a manual edit. Supply a fallback, as the example does for message, so rendering remains deterministic instead of generating notices or empty markup.
Keep callback responsibilities clear
Use the callback as the boundary between stored data and HTML. Read and validate the attributes first, obtain any server-side values your block needs, then build the wrapper and inner content. Returning one complete string makes the contract clear to WordPress and avoids accidental output from debugging statements or included files.
The $content argument contains saved inner block content when the block has inner blocks, while $block represents the current block instance. A simple notice may not need either argument, but accepting them keeps the callback signature compatible with dynamic block rendering and leaves room for later extensions.
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Use block.json when registration grows
A PHP array is convenient for a small block. A metadata file becomes easier to maintain when the block has several attributes, supports, styles, scripts, or a separate template. The render property points to a PHP file and is available from WordPress 6.1 onward.
Create a directory such as php-only-notice/notice/ inside the plugin and add this block.json:
{
"apiVersion": 3,
"name": "my-plugin/notice",
"title": "PHP Notice",
"category": "widgets",
"attributes": {
"message": {
"type": "string",
"default": "Hello from PHP"
}
},
"supports": {
"autoRegister": true,
"color": {
"background": true,
"text": true
}
},
"render": "file:./render.php"
}Register the metadata directory from the plugin:
<?php
add_action( 'init', function () {
register_block_type( __DIR__ . '/notice' );
} );WordPress reads the metadata, registers the block, and uses the referenced template for dynamic output. The template receives $attributes, $content, and $block. Keep the template focused on producing markup and escape values before printing them.
<?php
$message = isset( $attributes['message'] )
? $attributes['message']
: 'Hello from PHP';
$wrapper_attributes = get_block_wrapper_attributes();
?>
<div <?php echo $wrapper_attributes; ?>>
<?php echo esc_html( $message ); ?>
</div>Do not register both the array version and the metadata version under the same name. Choose one source of truth, or WordPress may report a duplicate or conflicting registration.
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A practical metadata-based plugin can contain a main loader, a block directory, block.json, and render.php:
php-only-notice/
├── php-only-notice.php
└── notice/
├── block.json
└── render.phpThe loader should do little more than attach registration to init. Keep presentation in render.php and avoid placing plugin bootstrapping, database queries, and large amounts of markup in the metadata file. This separation makes it obvious which file to inspect when a block fails to register and which file controls front-end output.
Understand dynamic rendering and saved content
A dynamic block separates persisted data from generated presentation. The post content stores the block comment and serialized attributes; the renderer creates the HTML when WordPress renders the post. This is useful for notices, query-driven lists, account information, or any output whose source data can change after publication.
Why a null save result matters
In a conventional JavaScript block, a save function returns markup that is written into post content. A dynamic block uses a null save result, so WordPress does not treat generated HTML as the canonical saved representation. The server callback becomes the canonical renderer.
Because only the delimiter and attributes are persisted, changing the PHP template or the value returned by a server query changes the next rendered response. You do not have to open and resave every post containing the block merely to refresh generated markup. The trade-off is that the callback must remain available whenever WordPress renders the post.
Trade-offs versus static markup
Static blocks can be simpler for fixed content because the generated markup is stored with the post. However, changing the saved markup or its structure can trigger block validation problems in existing posts. Dynamic rendering avoids stale generated HTML, but every front-end render depends on the PHP callback and any data it reads.
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Do not switch an established block casually between static and dynamic behavior. Existing posts may contain saved markup produced under the earlier model, and changing the block name, attribute schema, or save behavior can make those instances appear invalid. Preserve the name and supply sensible defaults while you decide how to migrate older content.
Editor behavior and live previews
Auto-registered PHP blocks are intended for server-rendered output and do not require a JavaScript block registration file. Authors can insert the block and edit registered attributes through the editor, but the editing experience is not equivalent to a fully custom React-based interface.
If an existing PHP renderer needs a live server preview in the editor, the @wordpress/server-side-render component requests the callback through /wp/v2/block-renderer/:block. The block and its attributes must already be registered in PHP for that endpoint to render anything.
That preview route does not replace registration. It is a way for a client-side editor component to ask WordPress for the same server-generated markup. If the endpoint returns nothing, first verify the PHP registration, block name, and attribute payload before investigating editor code.
Plan the attribute model around editing needs
- Use simple scalar attributes for values authors edit directly, such as a message or an identifier.
- Give each attribute a type and, where appropriate, a default so older instances remain renderable.
- Keep server-only state out of serialized attributes when it can be derived safely at render time.
- Expect complex interactions, conditional controls, and rich previews to require client-side code.
Every attribute is part of the block’s persistence contract. Renaming message, changing its type, or removing its default affects existing serialized comments. If an attribute is optional, make the callback tolerate its absence. If it is required for useful output, define a safe fallback rather than emitting an undefined-index notice.
PHP-only versus conventional server-and-client registration
| Axis | PHP-only auto-registered block | Conventional server + client registration |
|---|---|---|
| JavaScript required for registration | No | Usually yes for editor settings |
| Rendering | Server-side callback or PHP template | Static save or server-side callback |
| Best fit | Server-driven, low-interactivity output | Rich editor controls and interactive previews |
| Data freshness | Generated at render time | Depends on static or dynamic design |
| Supports integration | Available through server registration | Available when registered on the server |
The choice is about where rendering and interaction belong, not about whether PHP is allowed in Gutenberg. A client-side editor can still use a server-rendered front end; a PHP-only block simply keeps registration and rendering logic on the server.
Questions to ask before choosing
- Can the author work with core controls and a few stored values, or does the block need a custom interface?
- Should output reflect changing server data immediately, or should the published post preserve a snapshot?
- Is an existing PHP template the authoritative presentation that should be reused?
- Will the block need editor-only interactions that cannot be expressed through server registration and core supports?
If the answers emphasize server data, reusable PHP, and modest controls, auto-registration is a natural fit. If they emphasize complex editor behavior and immediate manipulation, plan for a JavaScript-assisted editor while retaining PHP for front-end rendering if that is useful.
Test the block before deploying it
- Activate the plugin and confirm that the block appears under the category declared in the registration or metadata.
- Insert the block, leave the default message unchanged, and save the post.
- Edit the message with characters such as
<,>, and quotation marks. View the front end and verify that they display as text rather than becoming markup. - Change the block’s text and background colors if those supports are enabled. Inspect the wrapper and confirm that the generated classes or styles are present.
- Update the default or renderer output in PHP, reload a post containing the block, and verify that dynamic output changes without manually editing the post content.
- Test an older or hand-edited block comment with the
messageattribute omitted. The fallback should render without a PHP notice.
Test both the editor and the public response. A block can be correctly registered yet fail on the front end because the callback is not callable, while a callback can render correctly for visitors but be absent from the editor because the registration hook never ran in that request. Testing with caches bypassed also helps distinguish PHP changes from stale HTML.
Troubleshooting common failures
The block does not appear in the inserter
- Confirm the plugin is active and the registration function is attached to
init. - Check that the block name contains a namespace and a block slug separated by a slash, such as
my-plugin/notice. - Make sure the metadata path points to the directory that actually contains
block.json. - Look for a PHP parse error or an invalid JSON property; either can prevent registration.
The front end shows an empty area or no markup
- Verify that
render_callbacknames a callable function and that the function returns a string. - Check that the callback is declared before registration is used, or that the file containing it is loaded by the plugin.
- Inspect the attribute key and type. A mismatch between the saved key and the callback’s lookup can produce an empty value.
- If using
render.php, verify the file path uses thefile:./render.phpform in metadata and that the file exists besideblock.json.
Color or other supports do not work
Declare the support in the server registration or block.json, then output get_block_wrapper_attributes() on the element that should receive those styles. Hard-coding a replacement wrapper without the helper prevents WordPress from adding registered support attributes.
Changes seem stuck after an edit
Clear page, object, or reverse-proxy caches that may be serving an older response, then reload the post while logged out. Dynamic rendering updates PHP output at render time, but an external cache can still retain a previous HTML response.
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Existing posts report validation errors
Check whether the block was changed from static saved markup to dynamic rendering, or whether its name and attribute definitions changed. Preserve the original block name and maintain sensible defaults for attributes already stored in posts. If the saved structure was intentionally changed, migrate existing content deliberately rather than silently changing the schema.
The editor preview differs from the front end
Compare the attributes sent to the server with the attributes stored in the post and make sure both paths use the same registration. If a server-side preview is implemented with @wordpress/server-side-render, confirm that the block-renderer endpoint can resolve the PHP registration. Differences often come from an attribute default, a missing wrapper helper, or a template that assumes a value is always present.
Practical design and maintenance guidance
Keep names stable
The block name is part of the serialized comment in post content. Treat the namespace and slug as a compatibility identifier: changing them makes existing instances appear to be unknown blocks unless you provide a migration strategy.
Keep rendering deterministic
Given the same attributes and server data, the callback should produce predictable markup. Avoid notices, undefined indexes, and conditional output that depends on an unvalidated value. Deterministic output makes editor previews and front-end debugging easier.
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Fetch or calculate server data in a focused function, then pass the resulting values into the template or output section. This keeps escaping visible at the point where values enter HTML and makes later changes less likely to introduce unsafe concatenation.
Document the attribute contract
Record each attribute’s type, default, and expected range in code comments or plugin documentation. This is especially important when several templates or future versions of the block consume the same attributes.
Keep one registration source
Use either the PHP array or the metadata directory for a given block name. Duplicating registration makes it unclear which attributes and supports WordPress should use and can lead to duplicate-registration errors. When moving from an array to block.json, keep the name and attribute definitions equivalent, test existing posts, and remove the old registration path.
Review changes as schema changes
Adding an optional attribute with a default is generally easier for existing content than deleting or renaming one. Before changing a type or removing a support, inspect representative posts and decide how older serialized attributes should be interpreted. A deliberate migration is safer than relying on a renderer to guess what an old value meant.
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Frequently asked questions
How do I create a Gutenberg block with PHP only?
Register a unique block name during init, define its attributes and supports, set autoRegister to true, and provide a render_callback. Return escaped HTML from the callback. For a larger block, put the same metadata in block.json and register its directory from PHP.
Can I make a dynamic block without JavaScript?
Yes. A PHP-registered dynamic block can save its delimiter and attributes while generating front-end markup through PHP. The editor experience is limited compared with a custom JavaScript interface, so this pattern is best when output is server-driven and interaction is modest.
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What does supports.autoRegister do?
It tells WordPress that the server-registered block can be auto-registered for editor use. It does not replace the PHP registration, attributes, or renderer; those still need to be valid when WordPress runs the init hook.
When should I use block.json instead of a PHP array?
Use a metadata file when the block has several attributes, supports, styles, scripts, or a separate PHP template. Its render property can point to render.php beginning with WordPress 6.1. A short PHP array remains practical for a small block.
Why is my callback not running?
Check that the registration function is attached to init, the callback name is callable, and the plugin file defining the callback is loaded. With metadata, confirm that render.php exists beside block.json and uses the file:./render.php reference.
How do I get a live server preview in the editor?
The @wordpress/server-side-render component can request the registered callback through /wp/v2/block-renderer/:block. The block and its attributes must be registered in PHP first. This adds a server preview but does not provide the rich editing controls of a custom client-side implementation.
Bottom line
To create a Gutenberg block with PHP only, register it during init, define its attributes and supports, enable autoRegister, and return escaped markup from a render_callback or PHP template. Use this pattern for low-interactivity, server-driven blocks whose output should stay current. Choose a JavaScript-assisted editor when authors need rich interactive controls or substantial client-side behavior.
Frequently Asked Questions
How do I create a Gutenberg block with PHP only?
Register a unique block during init, define its attributes and supports, enable supports.autoRegister, and return escaped HTML from a render_callback. For larger blocks, register a block.json directory and use its PHP render.php template.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCrashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteCan I make a dynamic block without JavaScript?
Yes. A PHP-registered dynamic block stores its delimiter and attributes while PHP generates the front-end markup. This works best for server-driven output with modest editing needs.
What does supports.autoRegister do?
It allows a block registered on the server to be auto-registered for editor use. The PHP registration, attributes, and renderer must still be valid.
When should I use block.json?
Use block.json when the block has multiple attributes, supports, styles, scripts, or a separate PHP template. The render property can reference render.php in WordPress 6.1 and later.
Why is my render callback not running?
Verify the init hook, callback name, plugin loading order, block name, and metadata path. For a template, confirm render.php exists beside block.json and uses file:./render.php.
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Yes. @wordpress/server-side-render can call /wp/v2/block-renderer/:block, provided the block and its attributes are registered in PHP.
The Bottom Line
Use PHP-only Gutenberg blocks when the server should own registration and rendering. Register on init, enable autoRegister, escape every output value, and keep attributes stable. Move to a JavaScript-assisted editor when rich interaction—not server-driven markup—is the primary requirement.
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