OPcache Config Generator

How it works

What it does

The OPcache Config Generator proposes a conservative starting opcache.ini based on host hints such as available RAM and workload style. It is explicitly a starting point—not a claim of a perfect production tune for every application.

When to use it

• Enabling OPcache on a new PHP-FPM pool
• Replacing cargo-cult copy/paste from outdated blog posts
• Preparing values before validating with opcache_get_status() on the target SAPI

How input is processed safely

Only numeric/text hints are accepted. The tool returns configuration text for download/copy. It does not restart PHP, does not read other vhosts’ status, and does not invent non-existent directives.

Examples

• Small VPS shared among few apps → modest memory_consumption
• Larger dedicated app server → higher interned strings and max accelerated files
• Reminders to disable risky revalidate settings in production without a deploy strategy

Common mistakes

• Copying huge cache sizes onto tiny hosts until the OOM killer appears
• Forgetting CLI and FPM have separate SAPIs/configs
• Never measuring hit rates after deployment

OPcache stores compiled opcodes so PHP does not recompile scripts on every request. Undersized caches thrash; oversized caches waste RAM that FPM workers could use. Interned strings and max accelerated files matter on large frameworks with thousands of PHP files.

After applying a generated starting point, inspect opcache_get_status() (through a protected admin script) on the correct SAPI. Watch hit rate, cached scripts, and memory usage over a realistic traffic window—not only immediately after deploy.

Avoid enabling dangerous validate timestamps settings in production without a coordinated deploy strategy. Stale code after release is a common cause of “I deployed but nothing changed” incidents.

Practical tips

• Keep inputs small and representative; huge pastes slow feedback and raise risk of accidental secret disclosure.
• After using OPcache Config Generator, verify the result in your own environment (correct SAPI, correct host, correct project root).
• Cross-link findings to ZendStudio.net PHP error guides and IDE setup pages when the next step is configuration rather than code edits.
• Prefer repeatable project tooling (CI, Composer scripts, IDE inspections) for repo-wide enforcement; this page is for interactive problem-solving.

Privacy note

No application source is required. Avoid pasting full production phpinfo output when gathering RAM figures—use admin metrics instead.

Safety notes

• Submitted tool contents are not written to analytics or search logs.
• This site never evaluates arbitrary PHP from the browser.
• Generated configs are starting points—validate on a staging host before production.