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<?php $releaseName = "1.345.2"; [$base, $suffix] = \explode('_', $releaseName, 2); var_dump($base, $suffix);
Output for 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Warning: Undefined array key 1 in /in/IZdOF on line 4 string(7) "1.345.2" NULL

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42.29 ms | 704 KiB | 4 Q