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<?php $factors = '(x-5)(x+2)(x-1)(x+2)'; $factors = preg_split('/(?<=\))(?=\()/', $factors); print_r($factors); if (count($factors) != count(array_unique($factors))) { echo "duplicate factors found!"; };
Output for 5.6.38, 7.0.33, 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 - 8.3.4, 8.3.6 - 8.3.7
Array ( [0] => (x-5) [1] => (x+2) [2] => (x-1) [3] => (x+2) ) duplicate factors found!
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] => (x-5) [1] => (x+2) [2] => (x-1) [3] => (x+2) ) duplicate factors found!
preferences:
177.83 ms | 402 KiB | 187 Q