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Opened 5 weeks ago

#61263 new defect (bug)

Nested hook removal removes remaining hooks with higher priority

Reported by: vendidero's profile vendidero Owned by:
Milestone: Awaiting Review Priority: normal
Severity: normal Version:
Component: General Keywords:
Focuses: Cc:


Hi there,

imagine the following nested hook code:

add_action( 'wp_loaded', function() {
    var_dump("loaded @ 1000");
}, 1000 );

add_action( 'wp_loaded', function() {
    var_dump("loaded @ 999");

    remove_all_actions( 'wp_loaded', 999 );
}, 999 );

What would the expected output be? I was expecting to see the "loaded @ 999" and the "loaded @ 1000" output followed by a break/exit. What actually happens is that there is only the "loaded @ 999" output print and nothing else. This seems to be related with the WP_Hook::resort_active_iterations() method which gets called right after removing a nested filter. It seems to be resetting the array keys of the priorities skips all the remaining, still registered filters when calling remove_filter(s) from inside a filter with the same priority as the current executed filter.

The example above doesn't make much sense as the wp_loaded hook is applied once per request only. There do exist other hooks that may be applied more than one time and therefor need to be cleared this way.

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