Online PHP editor | output for np1p0

<?php //old code function v1($first, $last) { $result = trim($first); $lastName = trim($last); if ($lastName) { if (!empty($result)) { $result .= ' '; } $result .= $lastName; } return $result; } //@Big-Shark function v2($first, $last) { return trim(implode(" ", [$first, $last])); } //@Hunternnm function v3($first, $last) { if(strlen(trim($first)) > 0 && strlen(trim($last)) > 0) { return $first." ".$last; } if(strlen(trim($first)) > 0) { return trim($first); } else { return trim($last); } } //@NelinD function v4($first, $last) { return implode(' ', array_filter([$first, $last], function ($string) { return trim($string); })); } //@NelinD function v5($first, $last) { return trim(trim($first).' '.trim($last)); } //@Big-Shark function v6($first, $last) { return trim($first.' '.$last); } function v($first, $last) { var_dump( v1($first, $last) ); var_dump( v2($first, $last) ); var_dump( v3($first, $last) ); var_dump( v4($first, $last) ); var_dump( v5($first, $last) ); var_dump( v6($first, $last) ); echo PHP_EOL; echo PHP_EOL; } v('first', 'last'); v('first', ''); v('first', ' '); v('', ' в last'); v(' ', ' в last'); v(' ', ' в last');