Array of JSON data types and object depth analysis

In JSON, there are two types of structures: objects and arrays.

1. An object begins with "{" (opening parenthesis), and "}" (closing parenthesis) ends. Each "name" is followed by a ":" (a colon), and the ' name/value ' pair is separated by a ', ' (comma). The name is enclosed in quotation marks; If the value is a string, it must be in parentheses, and the numeric type does not need

Son is an exceptionally straightforward data format, and the JSON rules are just as follows:

1 The data is separated by commas (",").
2) The mapping is represented by a colon (":").
3 the Set (array) of parallel data is represented by square brackets ("[]").
4 the Mapped collection (object) is represented by braces ("{}").

For example:

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{"Xlid": "Cxh", "Xldigitid": 123456, "Topscore": ", Topplaytime": "2009-08-20"}

2. An array is an ordered set of values (value). An array begins with "[" (left bracket), and "]" (right bracket) ends. Values are separated by the "," (comma) value.
For example:

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var jsonranklist=[{"Xlid": "Cxh", "Xldigitid": 123456, "Topscore": ", Topplaytime": "2009-08-20"},{"Xlid": "Zd", " Xldigitid ": 123456," Topscore ": 1500," Topplaytime ":" 2009-11-20 "}];

JSON has two structure arrays and objects: An array represents a collection of ordered data, while an object represents a collection of unordered data.
Look at the following example:

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$arr = array (A, ' AAA ', ' BBB ');   $arr 1 = array (     ' a ' => ' aaa ',     ' B ' => 222 ); &nb Sp $arr 2 = array (     ' a ' => ' aaa ',     ' other ' => array (   &N bsp;     ' BBB ', 1111    ) ); Echo Json_encode ($arr);//[111, "AAA", "BBB"]   Echo Json_encode ($arr 1);//{"a": "AAA", "B": 222} &NBSP Echo Json_encode ($arr 2)//{"a": "AAA", "Other": [BBB, 1111]}

From the above: because JavaScript does not support associative arrays, json_encode () only converts an indexed array (indexed array) into an array format and an associative array (associative array) into object format.

About PHP support for JSON description:
Json_encode only supports UTF-8 encoded data;
Json_decode always reflects only one PHP object, with the second argument true to return an array:

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$json = ' {' A ': ' AAA ', ' other ': [BBB ', 1111]} '; Print_r (Json_decode ($json)); Print_r (Json_decode ($json, true));

JSON string converted to JSON object

To use the above str1, you must first convert to a JSON object by using the following method:

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//converted from JSON string to JS On object var obj = eval (' + str + '); (JS has its own) or var obj = Str.parsejson (); or var obj = json.parse (str);//convert from JSON string to JSON object And then read as follows: Alert (obj.name); Alert (obj.sex);