WordPress plugin requirements define technical floors and dependencies for running a plugin.
Compare every declaration with the site’s actual software and server environment.
Meeting those floors permits evaluation; it never guarantees complete compatibility.
What are WordPress plugin version requirements?
They declare minimum WordPress, PHP, and dependency conditions for a plugin.
The main plugin file can also declare its own current version.
Documentation may add important requirements that headers cannot express.
Read the main plugin header first
WordPress recognises a plugin through comments inside its main PHP file. We took that apart in checking a plugin’s PHP compatibility.
Those comments provide identity, version, requirements, dependencies, and related metadata.
The Plugin Handbook lists every supported header field.
Understand Plugin Name
Plugin Name is the only required header field.
It tells WordPress the file represents a plugin.
A valid name alone provides no compatibility evidence.
Understand the Version header
Version states the plugin package’s current release number.
WordPress displays that value on the Plugins screen.
Update systems compare it with available package information.
Understand Requires at least
Requires at least declares the lowest supported WordPress version.
A site below that version does not meet the plugin’s floor.
A newer site still needs compatibility testing.
Understand Requires PHP
Requires PHP declares the minimum PHP runtime version.
The server must run that version or newer.
Newer PHP can still expose separate compatibility problems.
Understand Requires Plugins
Requires Plugins lists required plugins using WordPress.org-formatted slugs.
WordPress uses those dependencies during installation and activation workflows. We cover the method in how plugin dependencies work.
The field accepts a comma-separated list of slugs.
Understand the Network header
Network set to true restricts activation to network-wide activation.
It should be absent when that restriction is unnecessary.
The field does not promise broader multisite compatibility.
Do not confuse Update URI with a requirement
Update URI identifies third-party update provenance for certain plugins.
It helps prevent accidental replacement by similarly named directory plugins.
It does not declare platform compatibility.
Do not confuse Tested Up To with a minimum
Tested Up To records the WordPress release tested by the maintainer.
It belongs to directory readme information, not the minimum floor.
Requires at least answers a different question.
Do not confuse Stable Tag with WordPress support
Stable Tag points WordPress.org toward the distributed plugin release.
It refers to the plugin version, not WordPress.
The directory then reads the actual Version header.
Know which source WordPress.org reads
Since WordPress 5.8, readmes are not parsed for minimum requirements.
Requires PHP and Requires at least come from the main file.
The official readme documentation explains this source boundary.
Treat requirements as floors
A minimum defines the oldest declared acceptable version.
It does not identify the maintainer’s preferred version.
It also says nothing about every newer version.
Compare versions using software rules
Version strings are not ordinary decimal numbers.
WordPress uses PHP version comparison for plugin version numbers.
The handbook notes that 1.02 compares greater than 1.1.
Avoid casual version normalisation
Do not remove zeros or rewrite segments before comparison.
Preserve the exact values declared by software.
Use established comparison functions for automated decisions.
Check the site’s WordPress version
Find the current core version in WordPress administration.
Confirm deployment records when staging and production may differ.
Compare the exact site version with Requires at least.
Check the site’s PHP version
Read the active web runtime through Site Health information.
Command-line PHP may use another version.
Compare the runtime serving WordPress with Requires PHP.
Check every environment separately
Local, staging, command-line, and production versions can differ.
Record requirements against each deployment target.
A staging pass cannot override a production mismatch.
Check installed dependency plugins
Confirm every declared dependency is installed on the target environment.
Match slugs rather than display names.
Similar names do not satisfy dependency declarations.
Check dependency activation
Dependent plugins cannot activate until declared dependencies are active.
Active dependents also restrict dependency deactivation and deletion.
WordPress displays notices when requirements become unmet.
Understand dependency version limitations
Requires Plugins does not declare minimum or maximum dependency versions.
It also does not control plugin loading order.
The WordPress 6.5 dependency note documents both limitations.
Look for dependency versions elsewhere
Documentation or runtime checks may require particular dependency releases.
Read installation, upgrade, and developer documentation.
Test the exact dependency combination proposed for production.
Understand WordPress.org dependency limits
Directory-hosted dependents can declare only WordPress.org-hosted dependencies.
Third-party prerequisites may therefore exist only in documentation.
Review the complete installation path, not merely the header.
Understand third-party dependency handling
Non-directory plugins can declare dependencies hosted elsewhere.
WordPress cannot provide automatic installation links for those packages.
Operators must obtain and maintain them manually.
Understand must-use plugin limits
Core Plugin Dependencies does not officially support must-use dependencies.
A normal header may not represent that relationship.
Document and test must-use assumptions separately.
Understand theme dependency limits
Core Plugin Dependencies does not manage themes requiring plugins.
Theme and plugin authors use separate checks and messages.
Test the actual production theme combination.
Watch for circular dependencies
Circular requirements create a loop among dependent plugins.
WordPress detects the invalid relationship and blocks activation.
Plugin authors must correct the declarations.
Understand update-added dependencies
An update can introduce a dependency absent from the previous release.
WordPress currently allows the update and displays a notice.
Review target-version dependencies before applying updates.
Look for soft plugin requirements
A plugin may recommend another plugin without requiring it.
Optional integrations can enable only selected features.
Separate mandatory dependencies from feature-specific recommendations.
Look for PHP extension requirements
Requires PHP expresses a version, not required extensions.
Documentation may require image, encryption, internationalisation, or archive extensions.
Confirm those extensions exist on every target server.
Look for database requirements
Some plugins depend on database versions, engines, features, or collations.
These conditions lack a standard plugin header field.
Read documentation and compare the actual database environment.
Look for server resource requirements
Imports or media processing may need substantial memory and execution time.
Storage, process, and request limits can also matter.
Compare documented workloads with hosting limits.
Look for web server requirements
Some features depend on rewrite rules, headers, modules, or file access.
Apache and Nginx configurations can behave differently.
Follow the plugin’s supported server guidance.
Look for browser requirements
Interactive public output or editor controls may require modern browser features.
Plugin headers cannot express browser support.
Compare documentation with actual visitor and editor needs.
Look for external service requirements
Features may require vendor accounts, API versions, keys, or webhooks.
Service plans can impose usage and regional limits.
Those conditions belong inside the compatibility decision.
Look for licensing requirements
A commercial plugin may require an active licence for updates.
Specific features may require particular plans or add-ons.
Confirm the proposed licence supports the target environment.
Treat missing headers as unknowns
An absent requirement does not prove support for every old version.
It means the package provides less machine-readable evidence.
Seek current documentation or maintainer clarification.
Resolve header and documentation conflicts
Documentation can lag behind package metadata.
Record the contradiction and ask the maintainer.
Use stricter limits until authoritative evidence resolves it.
Resolve directory and package conflicts
The installed package is the code the site will execute.
Directory pages can reflect parsing delays or release mistakes.
Delay consequential adoption when identity or requirements remain unclear.
Check requirements before downloading
Directory and vendor pages provide an initial requirement screen.
Reject known hard mismatches before code reaches staging.
This saves time and reduces unnecessary package handling.
Check requirements again before activation
Inspect the exact installed candidate and dependency notices.
Confirm environment facts did not change during preparation.
Do not activate through unresolved hard failures.
Test above the declared floor
A qualifying version only clears the first screen.
Test the exact WordPress, PHP, dependencies, and configuration proposed.
Verify critical workflows and failure recovery on staging.
Record a requirement matrix
List each requirement, declared value, actual value, source, and result.
Include documented conditions outside standard headers.
Mark unknowns separately from confirmed matches.
Automate requirement checks where useful
Deployment tooling can compare declared floors with target environments.
Fail early on known incompatible WordPress or PHP versions.
Keep human review for undocumented operational requirements.
Recheck requirements before every upgrade
A later plugin release can raise minimum versions.
It can also introduce new plugin dependencies.
Read the target package requirements, not only the installed package.
Plan platform upgrades deliberately
Do not raise WordPress or PHP merely to silence one warning.
Inventory compatibility across themes, plugins, custom code, and infrastructure.
Test the complete platform change on staging.
Do not override requirements casually
Editing headers does not make incompatible code compatible.
It can bypass useful warnings and confuse future updates.
Use a supported package or change the environment properly.
Know the honest weak case
A simple plugin may depend only on WordPress and PHP.
Its requirement review can remain short.
Still test the exact environment before production adoption.
Understand installation enforcement
WordPress can warn or block actions when declared requirements fail.
The behaviour depends on requirement type and installation path.
Read the actual message before choosing a response.
Understand activation enforcement
Activation runs plugin code and therefore carries greater consequence.
WordPress blocks dependent activation when declared dependencies remain inactive.
Do not bypass that boundary through manual file edits.
Use the Plugins screen as evidence
The screen shows plugin names, versions, authors, states, and notices.
It can identify missing dependencies and activation failures.
Preserve screenshots when investigating requirement problems.
Use Site Health as environment evidence
Site Health information lists WordPress, plugins, server, and database details.
Export relevant facts before changing the environment.
Protect sensitive diagnostic information when sharing it.
Treat maximum versions separately
Standard headers focus on minimum WordPress and PHP versions.
A plugin may document unsupported newer platforms elsewhere.
Investigate explicit upper bounds before platform upgrades.
Treat pre-release requirements cautiously
Alpha, beta, and release-candidate platforms can change before stability.
A plugin’s stable requirements may not cover those builds.
Use isolated testing and explicit maintainer guidance.
Check command-line runtime differences
Scheduled commands can execute under another PHP binary.
That binary needs compatible versions and extensions too.
Test command-line workflows using their real execution environment.
Check deployment tooling requirements
Composer packages, build steps, or deployment scripts may add constraints.
They exist outside ordinary WordPress plugin headers.
Document them beside the production deployment procedure.
Check runtime feature detection
Plugins may test for classes, functions, interfaces, or constants.
These checks can express conditions absent from metadata.
Review resulting notices and disabled features during staging.
Check all dependencies as an AND set
Every listed Requires Plugins slug is mandatory.
The field does not express alternative dependency choices.
Read documentation for optional or substitutable integrations.
Preserve requirement evidence
Store package version, header values, documentation, and environment facts.
Add the review date and responsible decision owner.
This record explains later activation or upgrade decisions.
Use the plugin-requirements checklist
- Identify the exact candidate plugin package.
- Read its main plugin header.
- Record the plugin Version value.
- Record Requires at least.
- Record Requires PHP.
- Record every Requires Plugins slug.
- Note Network and Update URI separately.
- Do not confuse Tested Up To with a minimum.
- Do not confuse Stable Tag with WordPress support.
- Read requirements from the correct source.
- Compare exact versions using software rules.
- Record WordPress and PHP versions per environment.
- Confirm dependencies are installed and active.
- Find dependency-version requirements in documentation.
- Review third-party and must-use dependency limits.
- Review theme and circular dependency risks.
- Check target releases for new dependencies.
- Find soft and feature-specific requirements.
- Check PHP extensions and database conditions.
- Check server, browser, and external service conditions.
- Check licensing and plan requirements.
- Treat missing or conflicting declarations as unknowns.
- Build a complete requirement matrix.
- Reject hard mismatches before activation.
- Test the qualified environment on staging.
Frequently asked questions
What does Requires at least mean?
It declares the lowest WordPress version the plugin supports.
What does Requires PHP mean?
It declares the minimum PHP runtime version required.
What does Requires Plugins mean?
It lists WordPress.org-formatted slugs for mandatory plugin dependencies.
Can Requires Plugins specify dependency versions?
No. Core currently supports neither minimum nor maximum dependency versions.
Do matching requirements guarantee compatibility?
No. They clear declared floors but cannot prove complete site behaviour.
The verdict
Clear requirements reduce surprises. Compare the $299 lifetime suite against your actual environment.
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