<?php $resultSet = [ ['keyw' => 'sam , ram,shyam'], ['keyw' => 'sam,ram,shyam, mohan'], ['keyw' => 'sam, ram, shyam ,mohan,salman,babu , karan'], ]; $unique = []; foreach ($resultSet as $row) { $unique += array_flip(preg_split( '/ *, */', $row['keyw'], 0, PREG_SPLIT_NO_EMPTY )); } var_export(array_keys($unique));
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