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<?php $array = [ 'index' => 'value', 'mutex' => 'foo', 'dexter' => 'morgan' ]; $matches = array_filter($array, function ($key) { return false !== strpos($key, 'dex'); }, ARRAY_FILTER_USE_KEY); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["index"]=> string(5) "value" ["dexter"]=> string(6) "morgan" }

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