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<?php $input = [ ['01','03','02','15'], ['05','04','06','10'], ['07','09','08','11'], ['12','14','13','16'], ]; var_export( implode( '|', array_map( fn(...$column) => implode(',', $column), ...$input ) ) );
Output for rfc.property-hooks, git.master, git.master_jit
'01,05,07,12|03,04,09,14|02,06,08,13|15,10,11,16'

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