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OPcache served the old version of a script for up to 2 seconds after a change, so the page fetched by the hot reload client could be stale. The value is set through the SAPI INI defaults: php.ini files and php_ini directives still take precedence.
henderkes
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Oct 2, 2026
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| /* php.ini files and php_ini directives override these defaults. */ | ||
| static void frankenphp_ini_defaults(HashTable *configuration_hash) { | ||
| if (go_is_hot_reload_enabled()) { | ||
| /* Otherwise, a page reloaded right after a change may run the old code. */ | ||
| zval tmp; | ||
| ZVAL_NEW_STR(&tmp, zend_string_init("0", sizeof("0") - 1, 1)); | ||
| zend_hash_str_update(configuration_hash, "opcache.revalidate_freq", | ||
| sizeof("opcache.revalidate_freq") - 1, &tmp); | ||
| } | ||
| } | ||
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I'm not a fan of this. Can we not just do this for tests?
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I'm not sure to follow. It's not to fix our tests but making hot reload reliable.
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Oh, I thought this was only needed for tests. Have you benchmarked the impacts of this? Especially on Windows this could be a severe performance degradation.
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With the default
opcache.revalidate_freq=2, OPcache keeps serving the old version of a changed script for up to 2 seconds. The hot reload client fetches the page right after the Mercure update, so it often receives stale HTML: the morph is a no-op, or the full reload displays the old content. In an end-to-end test with headless Chrome and frankenphp-hot-reload, every PHP change was missed with the default settings.When
hot_reloadis configured,opcache.revalidate_freqnow defaults to0. The value is set through theini_defaultsSAPI hook (the one the CLI SAPI uses fordisplay_errors), which runs before the INI files are parsed: a value set inphp.ini, in a file ofPHP_INI_SCAN_DIR, or with thephp_inidirective takes precedence.Worker mode with
watchisn't affected, as it reboots PHP on every change.