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<?php class A {} class Test { //public function hello(A $a, $hi) public function hello($hi) { echo "Hi!\n"; } } class Child extends Test { public function hello(A $a, $hi) { echo "Hi!\n"; } } $test = new Test; $child = new Child; $a = new A; $test->hello($a, "Hi"); // Original signature $test->hello("Hi"); // Modified signature $child->hello($a, "Hi"); // Original signature $child->hello($a, "Hi"); // Child extending original signature $child->hello($a, "a", A::class, "Hi", 1, 2, 3, "no php doesn't do strict checks on user functions");
Output for 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: Declaration of Child::hello(A $a, $hi) must be compatible with Test::hello($hi) in /in/VvNKc on line 16
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Warning: Declaration of Child::hello(A $a, $hi) should be compatible with Test::hello($hi) in /in/VvNKc on line 16 Hi! Hi! Hi! Hi! Hi!
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Warning: Declaration of Child::hello(A $a, $hi) should be compatible with Test::hello($hi) in /in/VvNKc on line 20 Hi! Hi! Hi! Hi! Hi!
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Strict Standards: Declaration of Child::hello() should be compatible with Test::hello($hi) in /in/VvNKc on line 20 Hi! Hi! Hi! Hi! Hi!
Output for 5.4.0 - 5.4.45
Strict Standards: Declaration of Child::hello() should be compatible with Test::hello($hi) in /in/VvNKc on line 20 Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /in/VvNKc on line 30
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Strict Standards: Declaration of Child::hello() should be compatible with that of Test::hello() in /in/VvNKc on line 20 Parse error: syntax error, unexpected T_CLASS, expecting T_STRING or T_VARIABLE or '$' in /in/VvNKc on line 30
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Strict Standards: Declaration of Child::hello() should be compatible with that of Test::hello() in /in/VvNKc on line 20 Parse error: parse error, unexpected T_CLASS, expecting T_STRING or T_VARIABLE or '$' in /in/VvNKc on line 30
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/VvNKc on line 8
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/VvNKc on line 8
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/VvNKc on line 8
Process exited with code 255.

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