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<?php $string = 'abcd[efg]hi[jkl]m'; var_export( preg_split( '~(?:\[([^\]]+)])?~', $string, 0, PREG_SPLIT_NO_EMPTY|PREG_SPLIT_DELIM_CAPTURE ) );
Output for 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 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
array ( 0 => 'a', 1 => 'b', 2 => 'c', 3 => 'd', 4 => 'efg', 5 => 'h', 6 => 'i', 7 => 'jkl', 8 => 'm', )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 array ( 0 => 'a', 1 => 'b', 2 => 'c', 3 => 'd', 4 => 'efg', 5 => 'h', 6 => 'i', 7 => 'jkl', 8 => 'm', )

preferences:
99.88 ms | 402 KiB | 182 Q