3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = ' \mathrm{ABCdef123} none ABCdef123 \mathit{ABCdef123} none \mathnormal{ABCdef123} none \mathcal{ABC} '; $x = array_filter(preg_split('/\s+/', $x)); usort($x, function ($a, $b) { return strcmp(strtolower($a), strtolower($b)); }); foreach ($x as $xx) { echo $xx, "\n"; }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
\mathcal{ABC} \mathit{ABCdef123} \mathnormal{ABCdef123} \mathrm{ABCdef123} ABCdef123 none none none
preferences:
283.94 ms | 404 KiB | 334 Q