3v4l.org

run code in 300+ PHP versions simultaneously
<?php $first = 'GivenName'; $mid = 'Middle'; $surname = 'Surname'; $f_initial = substr($first, 0, 1); $m_initial = substr($mid, 0, 1); echo $f_initial . ' ' . $m_initial . ' ' . $surname;
Output for 7.0.0 - 7.0.25, 7.1.0 - 7.1.20, 7.2.5 - 7.2.33, 7.3.16 - 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 - 8.3.26, 8.4.1 - 8.4.13
G M Surname
preferences:
97.67 ms | 408 KiB | 5 Q