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<?php $list = [ '10-20', '12-14', '-5-10', '-10--2' ]; foreach ($list as $item) { list($first, $second) = preg_split('/(?<=\d)-/', $item); echo "\$first = $first, \$second = $second\n"; }
Output for 7.1.25 - 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
$first = 10, $second = 20 $first = 12, $second = 14 $first = -5, $second = 10 $first = -10, $second = -2

preferences:
221.91 ms | 403 KiB | 184 Q