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<?php class Pet { public $name; public function __construct ( $name ) { $this->name = $name; } public function speak ($what) { return $what; } } class Dog extends Pet { // Le he metido el null para que el parametro sea opcional public function speak ( $what ) { return $what ? parent::speak($what) : 'Woof Woof!'; /* // Otra alternativa para meter codigo mas complicado seria: if($what) return parent::speak($what); return 'Woof Woof'; */ } public function plays() { return 'fetch'; } } $charlie = new Dog ( 'Charlie' ); echo 'The dog\'s name is ' . $charlie->name . PHP_EOL; echo 'Speak of the super class: ' . $charlie->speak('hello, my name is ' . $charlie->name) . PHP_EOL; echo 'Speak of the dog class: ' . $charlie->speak() . PHP_EOL;
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 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
The dog's name is Charlie Speak of the super class: hello, my name is Charlie Fatal error: Uncaught ArgumentCountError: Too few arguments to function Dog::speak(), 0 passed in /in/hT55g on line 47 and exactly 1 expected in /in/hT55g:23 Stack trace: #0 /in/hT55g(47): Dog->speak() #1 {main} thrown in /in/hT55g on line 23
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33
The dog's name is Charlie Speak of the super class: hello, my name is Charlie Warning: Missing argument 1 for Dog::speak(), called in /in/hT55g on line 47 and defined in /in/hT55g on line 23 Notice: Undefined variable: what in /in/hT55g on line 25 Speak of the dog class: Woof Woof!
Output for 5.2.3 - 5.2.17
The dog's name is Charlie Speak of the super class: hello, my name is Charlie Warning: Missing argument 1 for Dog::speak(), called in /in/hT55g on line 47 and defined in /in/hT55g on line 23 Speak of the dog class: Woof Woof!
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.2
The dog's name is Charlie Speak of the super class: hello, my name is Charlie <br /> <b>Warning</b>: Missing argument 1 for Dog::speak(), called in /in/hT55g on line 47 and defined in <b>/in/hT55g</b> on line <b>23</b><br /> Speak of the dog class: Woof Woof!
Output for 5.0.2 - 5.0.5
The dog's name is Charlie Speak of the super class: hello, my name is Charlie <br /> <b>Warning</b>: Missing argument 1 for Dog::speak() in <b>/in/hT55g</b> on line <b>23</b><br /> Speak of the dog class: Woof Woof!
Output for 5.0.0 - 5.0.1
The dog's name is CharliePHP_EOLSpeak of the super class: hello, my name is CharliePHP_EOL<br /> <b>Warning</b>: Missing argument 1 for Dog::speak() in <b>/in/hT55g</b> on line <b>23</b><br /> Speak of the dog class: Woof Woof!PHP_EOL
Output for 4.4.2 - 4.4.9
<br /> <b>Parse error</b>: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in <b>/in/hT55g</b> on line <b>5</b><br />
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
<br /> <b>Parse error</b>: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in <b>/in/hT55g</b> on line <b>5</b><br />
Process exited with code 255.
Output for 4.3.2 - 4.3.4
<br /> <b>Parse error</b>: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in <b>/in/hT55g</b> on line <b>5</b><br />
Process exited with code 255.
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