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<?php test('()'); test('())'); test('(())'); test('))(('); test(')('); test(')(('); test('((()('); test('((()()(())))'); test('((()()(()))'); test('foo((bar)is(((baz))and)quix)'); function test($str) { echo "$str is ".(is_balanced($str)?'balanced':'not balanced')."\n"; } function is_balanced($str) { $count = 0; for($i=0;$i<strlen($str);$i++) { switch($str[$i]) { case '(': $count++; break; case ')': $count--; if($count < 0) return false; // ignore everything else } } return $count == 0; }
Output for git.master, git.master_jit, rfc.property-hooks
() is balanced ()) is not balanced (()) is balanced ))(( is not balanced )( is not balanced )(( is not balanced ((()( is not balanced ((()()(()))) is balanced ((()()(())) is not balanced foo((bar)is(((baz))and)quix) is balanced

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