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<?php interface NodeInterface { public function eval() : int; } class Node implements NodeInterface { public int $value; public string $sign; public Node $rightChild; public Node $leftChild; public function eval() { if ($rightChild != null) { return $this->value; } switch ($this->sign) { case "+": return $this->leftChild->value + $this->rightChild->value; //... } } } $root = new Node(); $root->value = 10; echo $root->eval();
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.4, 8.3.6 - 8.3.13
Fatal error: Declaration of Node::eval() must be compatible with NodeInterface::eval(): int in /in/GM05J on line 15
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Fatal error: Declaration of Node::eval() must be compatible with NodeInterface::eval(): int in /in/GM05J on line 15
Process exited with code 255.
Output for 7.3.13 - 7.3.33
Parse error: syntax error, unexpected 'int' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST) in /in/GM05J on line 10
Process exited with code 255.
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