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<?php $array = [ ['1923', 'apr', 'a'], ['2001', 'apr', 'a'], ['2010', 'apr', 'a'], ['1956', 'apr', 'a'], ['1923', 'apr', 'a'], ['2001', 'apr', 'a'], ['2001', 'apr', 'a'], ]; var_dump(array_count_values(array_column($array, 0)));
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [1923]=> int(2) [2001]=> int(3) [2010]=> int(1) [1956]=> int(1) }

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