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<?php class ExpressionCalculator { private $operators = array(); public function __construct() { $operators['+'] = function ($leftOperand, $rightOperand) { return $leftOperand + $rightOperand; }; $operators['-'] = function ($leftOperand, $rightOperand) { return $leftOperand - $rightOperand; }; $operators['*'] = function ($leftOperand, $rightOperand) { return $leftOperand * $rightOperand; }; $operators['/'] = function ($leftOperand, $rightOperand) { return $leftOperand / $rightOperand; }; } public function calc($expression) { $operands = array(); while (($token = strtok($expression, ' ')) !== false) { if ($this->isOperator($token)) { $rightOperand = array_pop($operands); $leftOperand = array_pop($operands); $result = $this->execute($token, $leftOperand, $rightOperand); array_push($operands, $result); } else if (is_numeric($token)) { array_push($operands, $token); } else { throw new InvalidArgumentException('Expression has invalid token: ' + $token); } } return $result; } private function isOperator($token) { return isset($operators[$token]); } private function execute($operator, $leftOperand, $rightOperand) { return call_user_func($operators[$operator], $leftOperand, $rightOperand); } } $calc = new ExpressionCalculator(); echo $calc->calc('5 1 2 + 4 * + 3 -'); // 14
Output for 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Out of memory (allocated 27267072 bytes) (tried to allocate 16777224 bytes) in /in/cAHiS on line 31 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 8.1.2 - 8.1.27
Fatal error: Out of memory (allocated 18878464) (tried to allocate 16777224 bytes) in /in/cAHiS on line 31 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.1
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 33554440 bytes) in /in/cAHiS on line 31
Process exited with code 255.
Output for 7.3.32 - 7.3.33, 7.4.26, 8.0.13
Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 67108872 bytes) in /in/cAHiS on line 31
Process exited with code 255.
Output for 5.4.0 - 5.4.9, 5.6.0 - 5.6.28
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 72 bytes) in /in/cAHiS on line 31
Process exited with code 255.
Output for 5.4.10 - 5.4.45, 5.5.0 - 5.5.38
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 32 bytes) in /in/cAHiS on line 24
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 71 bytes) in /in/cAHiS on line 31
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/cAHiS on line 7
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/cAHiS on line 7
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/cAHiS 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
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/cAHiS on line 4
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/cAHiS on line 4
Process exited with code 255.

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