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<?php function isCorrect($string) { $len = strlen($string); $stack = []; for( $i = 0; $i < $len; ++$i) { if ($string[$i] == '(') array_push($stack, $string[i]); else if($string[$i] == ')') { if ( empty($stack) === false) array_pop($stack); else return false; } } return empty($stack); } $string = '((()))'; isCorrect($string); //var_dump(isCorrect($string)); //var_dump(strlen($string) % 2); //assert(isCorrect('') === true); //assert(isCorrect('()') === true); //assert(isCorrect('{()}') === true); //assert(isCorrect('{()}{}') === true); //assert(isCorrect('(())') === true); //assert(isCorrect('{({({({()})})})}') === true); //assert(isCorrect('{(})') === false);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Fatal error: Uncaught Error: Undefined constant "i" in /in/G96HY:7 Stack trace: #0 /in/G96HY(18): isCorrect('((()))') #1 {main} thrown in /in/G96HY on line 7
Process exited with code 255.
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 Fatal error: Uncaught Error: Undefined constant "i" in /in/G96HY:7 Stack trace: #0 /in/G96HY(18): isCorrect('((()))') #1 {main} thrown in /in/G96HY on line 7
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant i - assumed 'i' (this will throw an Error in a future version of PHP) in /in/G96HY on line 7 Warning: Illegal string offset 'i' in /in/G96HY on line 7 Warning: Use of undefined constant i - assumed 'i' (this will throw an Error in a future version of PHP) in /in/G96HY on line 7 Warning: Illegal string offset 'i' in /in/G96HY on line 7 Warning: Use of undefined constant i - assumed 'i' (this will throw an Error in a future version of PHP) in /in/G96HY on line 7 Warning: Illegal string offset 'i' in /in/G96HY on line 7
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33
Notice: Use of undefined constant i - assumed 'i' in /in/G96HY on line 7 Warning: Illegal string offset 'i' in /in/G96HY on line 7 Notice: Use of undefined constant i - assumed 'i' in /in/G96HY on line 7 Warning: Illegal string offset 'i' in /in/G96HY on line 7 Notice: Use of undefined constant i - assumed 'i' in /in/G96HY on line 7 Warning: Illegal string offset 'i' in /in/G96HY on line 7
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/G96HY on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/G96HY on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/G96HY on line 4
Process exited with code 255.
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