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<?php $string = '3-6,8,12,14-20'; var_export( json_decode( '[' . preg_replace_callback( '/(\d+)-(\d+)/', fn($m) => implode(',', range($m[1], $m[2])), $string ) . ']' ) );
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0
array ( 0 => 3, 1 => 4, 2 => 5, 3 => 6, 4 => 8, 5 => 12, 6 => 14, 7 => 15, 8 => 16, 9 => 17, 10 => 18, 11 => 19, 12 => 20, )
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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