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<?php function floorDiff(string $input): int { $positiveMatches = preg_match_all ('/\(/', $input); $negativeMatches = preg_match_all ('/\)/', $input); return $positiveMatches - $negativeMatches; } assert(floorDiff('(') === 1); assert(floorDiff(')') === -1); assert(floorDiff('()') === 0); assert(floorDiff('(()))))') === -3); var_dump (floorDiff('(()))))') );
Output for git.master, git.master_jit, rfc.property-hooks
int(-3)

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