JavaScript Object symbol of php (JSON)

The JavaScript Object symbol (JSON) of PHP extensions starts with PHP 5.2.0. JSON extensions are built in and compiled into PHP by default.

JSON serialization interface JsonSerializable

Classes that implement JsonSerializable can customize their JSON representation in json_encode.

JsonSerializable: jsonSerialize-specifies the data to be serialized into JSON

Example #1 returns an array

 array = $array;        }        public function jsonSerialize() {            return $this->array;        }    }    $array = [1, 2, 3];    echo json_encode(new ArrayValue($array), JSON_PRETTY_PRINT);?>

The above routine will output:

[    1,    2,    3]

Example #2 returns an associated array

 array = $array;        }        public function jsonSerialize() {            return $this->array;        }    }    $array = ['foo' => 'bar', 'quux' => 'baz'];    echo json_encode(new ArrayValue($array), JSON_PRETTY_PRINT);?>

The above routine will output:

{    "foo": "bar",    "quux": "baz"}

Example #3 returns an integer.

 number = (integer) $number;        }        public function jsonSerialize() {            return $this->number;        }    }    echo json_encode(new IntegerValue(1), JSON_PRETTY_PRINT);?>

The above routine will output:

1

Example #4 returns a string

 string = (string) $string;        }        public function jsonSerialize() {            return $this->string;        }    }    echo json_encode(new StringValue('Hello!'), JSON_PRETTY_PRINT);?>

The above routine will output:

"Hello! "

JSON Functions

Json_decode-encode strings in JSON format

Json_encode-JSON encoding of variables

Json_last_error_msg-Returns the error string of the last json_encode () or json_decode () call

Json_last_error-return the final error