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<?php $array = array_flip(['foo_bar', 'foo_baz', 'foo_bat', 'bar_baz', 'bar_bat', 'bat_bat']); var_export($array); echo "\n"; var_export(array_filter($array, function($k) { return strpos($k, "_bat") !== FALSE; }, ARRAY_FILTER_USE_KEY));
Output for git.master, git.master_jit, rfc.property-hooks
array ( 'foo_bar' => 0, 'foo_baz' => 1, 'foo_bat' => 2, 'bar_baz' => 3, 'bar_bat' => 4, 'bat_bat' => 5, ) array ( 'foo_bat' => 2, 'bar_bat' => 4, 'bat_bat' => 5, )

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