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<?php class Carro { protected $productos = array (); public function add ( $producto, $cantidad ) { $this->productos[$producto] = $cantidad; } public function what_inside_cart () { $cadena = ""; $callback = function ( $cantidad, $producto ) use ( $cadena ) { echo $producto; $cadena += $producto . "\r\n"; }; array_walk ( $this->productos, $callback ); return $cadena; } } $mi_carro = new Carro; // Añadir algunos artículos al carro $mi_carro->add ( 'mantequilla', 1 ); $mi_carro->add ( 'leche', 3 ); $mi_carro->add ( 'huevos', 6 ); echo $mi_carro->what_inside_cart (); //echo $mi_carro->productos[0];
Output for git.master, git.master_jit, rfc.property-hooks
mantequilla Fatal error: Uncaught TypeError: Unsupported operand types: string + string in /in/SgV1S:19 Stack trace: #0 [internal function]: Carro->{closure}(1, 'mantequilla') #1 /in/SgV1S(22): array_walk(Array, Object(Closure)) #2 /in/SgV1S(34): Carro->what_inside_cart() #3 {main} thrown in /in/SgV1S on line 19
Process exited with code 255.

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