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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);

This is an error 500

Value for `_results` contains invalid data `array`


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