3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [ 'x' => 'Laura Smith', 'y' => 'John. Smith', 'z' => 'John Doe' ]; foreach ($array as $key => $value) { $array[$key] = strstr($value, ' ', true); } var_export($array);
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array ( 'x' => 'Laura', 'y' => 'John.', 'z' => 'John', )

preferences:
101.49 ms | 407 KiB | 5 Q