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<?php class ExpressionCalculator { public function calc($expression) { $operands = array(); while (($token = strtok($expression, ' ')) !== false) { if (isOperator($token)) { $rightOperand = array_pop($operands); $leftOperand = array_pop($operands); $result = $this->execute($token, $leftOperand, $rightOperand); array_push($operands, $result); continue; } array_push($operands, $token); } return $result; } } $calc = new ExpressionCalculator(); echo $calc->calc('5 1 2 + 4 * + 3 -'); // 14
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.12 - 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 - 8.3.6
Fatal error: Uncaught Error: Call to undefined function isOperator() in /in/ZE8NM:9 Stack trace: #0 /in/ZE8NM(26): ExpressionCalculator->calc('5 1 2 + 4 * + 3...') #1 {main} thrown in /in/ZE8NM on line 9
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.1 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
Fatal error: Call to undefined function isOperator() in /in/ZE8NM on line 9
Process exited with code 255.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/ZE8NM on line 26
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/ZE8NM on line 5
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
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/ZE8NM on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/ZE8NM on line 5
Process exited with code 255.
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263.76 ms | 401 KiB | 357 Q