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The reliable pattern is: put registration code in a plugin (so it survives a theme change), register it during WordPress initialization, define accepted attributes with shortcode_atts(), sanitize and escape every value for its output context, and use do_shortcode() when enclosed content can contain other shortcodes. If a shortcode appears as plain text, the tag is usually not registered, the callback is not loaded, or the content is not passing through a shortcode-aware filter.
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What a WordPress shortcode does
A shortcode is a bracketed macro embedded in WordPress content. WordPress scans content for a registered tag, calls the PHP function associated with that tag, and replaces the bracketed expression with the string returned by the function. The replacement can be a paragraph, a notice box, a button, a list, or any other markup your callback safely generates.
Registration is the connection between the text a writer enters and the PHP that runs. Without registration, [acme_notice] has no meaning to WordPress and remains ordinary text. A tag should be lowercase and should use a distinctive prefix. A later registration of the same tag replaces the earlier callback, so generic names such as [box] or are collision-prone.
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The processing sequence
- WordPress loads the plugin or theme code that contains your registration.
add_shortcode()associates a tag, such asacme_notice, with a callback function.- When content is filtered, WordPress identifies the bracketed tag and parses its attributes and enclosed content.
- The callback receives the parsed attributes and, for an enclosing shortcode, the inner content.
- The callback returns a replacement string, which WordPress inserts into the filtered content.
Where to put shortcode PHP
For a shortcode that should remain available when you change themes, place the code in a small custom plugin. Theme code is appropriate only when the shortcode is intentionally part of that theme’s presentation and you accept that it will disappear when the theme is removed or replaced.
Plugin placement
Create a PHP file in a plugin directory, add a normal WordPress plugin header, define the callback, and register the tag from the plugin’s initialization routine. The following complete example can be adapted for a plugin file:
<?php
/**
* Plugin Name: Acme Notice Shortcode
*/
function acme_notice_shortcode( $atts, $content = null ) {
$atts = shortcode_atts(
array( 'type' => 'info' ),
$atts,
'acme_notice'
);
return '<div class="notice notice-' . esc_attr( $atts['type'] ) . '">' . esc_html( $content ?? '' ) . '</div>';
}
function acme_notice_register_shortcode() {
add_shortcode( 'acme_notice', 'acme_notice_shortcode' );
}
add_action( 'init', 'acme_notice_register_shortcode' );Save the file in its own plugin folder, activate that plugin in the WordPress admin, and then insert [acme_notice]Message[/acme_notice] into content. Registering on init ensures the tag is added during the normal WordPress loading sequence rather than only when a particular template happens to run.
Theme placement
If the shortcode belongs to a specific theme, the same function and add_shortcode() call can live in that theme’s PHP files. Keep the registration in code that loads on every request, not inside a template that runs only on one page. Before switching themes, replace theme-dependent shortcodes with a plugin implementation or expect existing posts to show the raw bracketed tags.
Build the smallest useful shortcode
The callback receives two important values. The first parameter contains attributes; the second contains enclosed content and is null for a self-closing use. A callback should return its replacement string and should not echo output. Echoing can place markup in the wrong location and can interfere with the content filter that is assembling the page.
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Self-closing example
Use a self-closing form when the shortcode represents a fixed element and does not need inner text:
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Enclosing example
Use an opening and closing tag when the writer supplies text or other content:
[acme_notice]Your save is complete.[/acme_notice]Do not try to combine both forms in one construct. A mixed expression that starts and closes like an enclosing shortcode while also adding a self-closing form is not interpreted as two independent shortcodes.
Define and use attributes safely
Attributes make one shortcode produce different output without duplicating PHP. WordPress passes the values in an array. shortcode_atts() lets you declare the keys your shortcode accepts, provides defaults for omitted keys, and ignores unknown keys.
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function acme_button_shortcode( $atts ) {
$atts = shortcode_atts(
array(
'url' => '#',
'label' => 'Read more',
'style' => 'primary',
),
$atts,
'acme_button'
);
return '<a class="button button-' . esc_attr( $atts['style'] ) . '" href="' . esc_url( $atts['url'] ) . '">' . esc_html( $atts['label'] ) . '</a>';
}
add_shortcode( 'acme_button', 'acme_button_shortcode' );Authors can use that shortcode as [acme_button url="https://example.com" label="Open the guide" style="secondary" /]. Attribute names are lowercased while WordPress processes them, so define accepted keys in lowercase. Treat every value as untrusted input: validate allowed options, sanitize values where appropriate, and escape at the point where the value enters HTML.
Choose the correct escaping function
- Use
esc_html()for visible text, such as a message or button label. - Use
esc_attr()for an HTML attribute or a class fragment. - Use
esc_url()for a URL placed in anhrefor similar attribute.
Escaping is context-specific. A value that is safe as text is not automatically safe in an attribute, URL, class name, or query. Restrict values such as a notice type or visual style to the options your code actually supports instead of allowing arbitrary class names.
Handle enclosed content
For an enclosing shortcode, the callback’s $content parameter contains everything between the opening and closing tags. It can be empty, so code should tolerate null or an empty string. The minimal notice example uses esc_html( $content ?? '' ), which treats the enclosed value as text and prevents markup from being interpreted.
Allow nested shortcodes intentionally
If the enclosed area is supposed to contain other registered shortcodes, process it with do_shortcode( $content ) before wrapping it:
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function acme_panel_shortcode( $atts, $content = null ) {
$atts = shortcode_atts(
array( 'title' => '' ),
$atts,
'acme_panel'
);
$title = '';
if ( '' !== $atts['title'] ) {
$title = '<h3>' . esc_html( $atts['title'] ) . '</h3>';
}
return '<section class="panel">' . $title . do_shortcode( $content ?? '' ) . '</section>';
}
add_shortcode( 'acme_panel', 'acme_panel_shortcode' );do_shortcode() scans the supplied content for registered tags and replaces them with their callbacks’ return values. If no tags are registered in that content, it simply returns the content without shortcode filtering. This is why nested markup may remain literal when the inner tag was never registered.
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Only call do_shortcode() when nested shortcodes are part of the design. If the enclosed value is meant to be plain text, escape it instead; otherwise an author could insert markup or another shortcode where your interface expects a label.
Compare the implementation choices
| Decision | Use this when | Syntax or consequence |
|---|---|---|
| Self-closing shortcode | The component has no writer-supplied body. | [acme_notice type="warning" /]; the callback receives no enclosed content. |
| Enclosing shortcode | The author supplies a message or other inner content. | [acme_notice]Message[/acme_notice]; the callback receives $content. |
| Fixed output | The output is always the same apart from internal logic. | Fewer accepted attributes and fewer validation paths. |
| Attribute-driven output | Authors need controlled variations such as type, label, or URL. | Declare defaults with shortcode_atts() and validate each option. |
| Flat content | Inner text must remain text. | Escape with esc_html(); do not run do_shortcode(). |
| Nested shortcodes | The component intentionally contains other shortcode components. | Run do_shortcode( $content ) before wrapping the result. |
| Plugin registration | The shortcode should survive a theme change. | Register from plugin code, commonly during init. |
| Theme registration | The shortcode is inseparable from one theme’s presentation. | It is portable only with that theme and may become raw text after a switch. |
Test a shortcode in a controlled order
- Activate the plugin or switch to the theme containing the code.
- Insert the exact registered tag, including spelling and lowercase characters, into a test post.
- Test the self-closing form first, then the enclosing form if your callback supports both.
- Omit each attribute once to confirm that its declared default is used.
- Pass an unknown attribute and verify that it does not alter output.
- Try an allowed and a disallowed value for options such as
typeorstyle; your validation should handle the latter predictably. - If nesting is supported, put a second known shortcode inside the enclosing content and confirm that
do_shortcode()processes it. - Inspect the rendered HTML and check that text, attributes, classes, and URLs are escaped for their contexts.
Keep a test instance separate from production content while changing callback code. A PHP syntax error or a malformed return string can affect the entire request, while a controlled post makes it easier to identify whether registration, parsing, or rendering is at fault.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Fix a shortcode that appears as text
The tag is not registered
Confirm that the spelling in the post exactly matches the first argument passed to add_shortcode(). A typo, a changed prefix, or a plugin that is not active leaves the bracketed expression untouched.
The PHP file never loads
Ensure the plugin is activated and that registration code is outside a conditional or template path that does not run on the affected request. For theme code, verify that the active theme is the one containing the function.
The content is not shortcode-aware
WordPress replaces registered tags only when the content passes through a shortcode-aware filter. If a custom template, field, or application displays raw post data without applying the relevant content processing, the tag can remain visible even though registration is correct. Route that content through the same shortcode-aware processing your rendering context expects, rather than assuming every text field is parsed automatically.
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The callback echoes instead of returning
Replace output statements with a returned string. The shortcode callback should produce no direct output of its own; WordPress inserts the returned value at the shortcode’s location.
The enclosing syntax is malformed
Use either a self-closing form or a properly paired opening and closing form. Check that the closing tag uses the same name and that you have not mixed both forms in one expression.
A nested shortcode remains literal
Check that the inner tag is registered and that the outer callback calls do_shortcode() on its enclosed content. Without that call, the outer callback will wrap the inner bracketed text rather than process it.
Display shortcode text literally
To show a registered shortcode as an example instead of executing it, double the brackets:
[[acme_notice]]The doubled form tells WordPress to render the shortcode notation literally. Use it in documentation, tutorials, or editor-facing instructions where readers need to see the syntax itself.
Design conventions that prevent maintenance problems
- Choose a distinctive, lowercase tag with a project prefix, such as
acme_notice, to reduce collisions with plugins and themes. - Keep one responsibility per shortcode. A notice shortcode should not also perform unrelated database work or register several hidden tags.
- Declare every supported attribute in one defaults array so the accepted interface is visible to future maintainers.
- Validate enumerated values before using them in classes, URLs, queries, or other dynamic output.
- Return a complete replacement string and keep rendering concerns inside the callback or a dedicated rendering function.
- Escape at the final output context, even when a value came from a trusted-looking editor field.
- Document whether the tag is self-closing, enclosing, or supports both, and show one valid example for each supported form.
A practical shortcode checklist
- Decide whether the component needs enclosed content, attributes, nesting, or only fixed output.
- Select a lowercase, prefixed tag that is unlikely to collide with another registration.
- Put persistent functionality in a plugin and load it during
init. - Write a callback with
$attsand, when needed,$content = null. - Use
shortcode_atts()to define defaults and ignore unknown keys. - Validate or sanitize every accepted value.
- Escape text, attributes, classes, and URLs with the function appropriate to each context.
- Return the replacement string; never echo from the callback.
- Call
do_shortcode()only for enclosed content that is intentionally allowed to contain nested shortcodes. - Test registration, both syntax forms, omitted attributes, invalid values, nesting, and literal display with doubled brackets.
Key takeaways
A shortcode is a registered tag-to-callback mapping, not merely text in square brackets. Registration makes the tag meaningful, the callback’s return value becomes the rendered replacement, and shortcode_atts() gives attributes a controlled interface with defaults. Enclosing tags provide $content; nested tags require do_shortcode(); and every dynamic value must be escaped for its output context. Use a prefixed plugin-based implementation when the shortcode must remain available across theme changes, and double the brackets whenever the syntax itself should appear on the page.
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