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<?php $arr = array ( 1 => 'one', 2 => 'two', 3 => 'three', 4 => 'four' ); $comma_separated = implode(", ", $arr); echo preg_replace('/\,([^,]+)$/', ' and $1', $comma_separated);

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107.16 ms | 1612 KiB | 5 Q