How to understand php json and xml serialization / deserialization

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Serialization and deserialization of objects are often used in web development. The mainstream ones are serialization and deserialization of json format and xml format. Today, I want to write a small demo of jsop, but I found that I can't use php serialization. I checked the data and took notes on simple array json format serialization / deserialization.

Php provides json_encode and json_decode functions to serialize / deserialize objects in json format

$data=array ('Name'= >' Byron','Age'= > 24 Male','Friends'= > array ('Casper','Frank','Vincent')); $json=json_encode ($data); / / serialize the array into the json string echo $json.''; $array_json= json_decode ($json); / / deserialize the json string into the array while (list ($key,$value) = each ($array_json)) {if (! is_array ($value)) {echo "$key: $value" } else {echo "$key:"; foreach ($value as $current) {echo "$current  ";} echo';}}

Simple array xml format serialization / deserialization

Php provides wddx_serialize_value and wddx_deserialize functions to serialize / deserialize objects in xml format

$data=array ('Name'= >' Byron','Age'= > 24 Male','Friends'= > array ('Casper','Frank','Vincent')); $xml=wddx_serialize_value ($data); / / serialize the array into the xml string echo $xml.''; $array_xml=wddx_deserialize ($xml); / / deserialize the xml string into the array while (list ($key,$value) = each ($array_xml)) {if (! is_array ($value)) {echo "$key: $value" } else {echo "$key:"; foreach ($value as $current) {echo "$current  ";} echo';}}

Although the output format is strange due to HTML transcoding, the serialized string looks like this

Compared with json format, there are many more fields.

Complex object json format serialization / deserialization many times when we operate, the object we deal with is not a simple array, but an array of objects that we customize, and json_encode and json_decode are also competent. Customize an object similar to the contents of the array above

Class Me {public $name; public $age; public $friends; function _ construct ($name,$age,$friends) {$this- > name=$name; $this- > age=$age; $this- > friends=$friends;}} $me1=new Me ('Byron',24,array (' Casper','Frank','Vincent')); $me2=new Me ('Casper',25,array (' Byron','Frank','Vincent')); $me3=new Me ('Frank',26,array (' Casper','Byron','Vincent')) / / create a complex array with child elements of a custom class that contains array fields $array_me=array ($me1,$me2,$me3); $json=json_encode ($array_me); / / serializes the object array as the json string echo $json.''; $a=json_decode ($json); / / deserializes the json string into the object array foreach ($an as $aa) {echo $aa- > name.'';}

You can see that the serialized string format works well as expected. Serialization / deserialization of complex objects in xml format similarly wddx_serialize_value and wddx_deserialize functions are also competent for serialization / deserialization of complex objects in xml format, using the object just mentioned as an example

$me1=new Me ('Byron',24,array (' Casper','Frank','Vincent')); $me2=new Me ('Casper',25,array (' Byron','Frank','Vincent')); $me3=new Me ('Frank',26,array (' Casper','Byron','Vincent')); / / create a complex array with subelements of a custom class that contains array fields $array_me=array ($me1,$me2,$me3); $xml=wddx_serialize_value ($array_me) / serialize the object array as the xml string echo $xml.''; $a=wddx_deserialize ($xml); / / deserialize the xml string into the object array foreach ($an as $aa) {echo $aa- > name.'';}

The generated xml string structure looks like this

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