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run code in 200+ php & hhvm versions
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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('(()))))') );
based on Yv1Y7
Output for 7.0.0 - 7.2.0
int(-3)
Output for 5.3.20 - 5.6.28
Parse error: syntax error, unexpected ':', expecting '{' in /in/jT2gE on line 3
Process exited with code 255.