JSON instance (I)

PHP JSON

In this chapter, we will show you how to use PHP Language to encode and decode JSON object .

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Environment configuration

stay php5.2.0 And above versions have been built in JSON Expand .

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JSON function

function	describe
json_encode	On variables JSON code
json_decode	Yes JSON Format of the string , Convert to PHP Variable
json_last_error	Returns the last error that occurred

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json_encode

PHP json_encode() Used to modify variables JSON code , If the function is executed successfully, it returns JSON data , Otherwise return to FALSE .

grammar

string json_encode ( $value [, $options = 0 ] )

Parameters

• value: The value to encode . This function only applies to UTF-8 The encoded data is valid .

• options: Binary mask consisting of the following constants JSON_HEX_QUOT, JSON_HEX_TAG, JSON_HEX_AMP, JSON_HEX_APOS, JSON_NUMERIC_CHECK, JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, JSON_FORCE_OBJECT, JSON_PRESERVE_ZERO_FRACTION, JSON_UNESCAPED_UNICODE, JSON_PARTIAL_OUTPUT_ON_ERROR.

  It should be noted that JSON_UNESCAPED_UNICODE Options , If we don't want Chinese to be encoded , You can add this option .

example

The following example demonstrates how to PHP Array to JSON Format data ：

<?php
   $arr = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5);
   echo json_encode($arr);
?>

The execution result of the above code is ：

{"a":1,"b":2,"c":3,"d":4,"e":5}

The following example demonstrates how to PHP Object to JSON Format data ：

example

<?php
   class Emp {
       public $name = "";
       public $hobbies  = "";
       public $birthdate = "";
   }
   $e = new Emp();
   $e->name = "sachin";
   $e->hobbies  = "sports";
   $e->birthdate = date('m/d/Y h:i:s a', "8/5/1974 12:20:03 p");
   $e->birthdate = date('m/d/Y h:i:s a', strtotime("8/5/1974 12:20:03"));

   echo json_encode($e);
?>

The execution result of the above code is ：

{"name":"sachin","hobbies":"sports","birthdate":"08\/05\/1974 12:20:03 pm"}

Use JSON_UNESCAPED_UNICODE Options

<?php
   $arr = array('runoob' => ' Novice tutorial ', 'taobao' => ' TaoBao ');
   echo json_encode($arr); //  Coded Chinese
   echo PHP_EOL;  //  A newline
   echo json_encode($arr, JSON_UNESCAPED_UNICODE);  //  No coding Chinese
?>

The execution result of the above code is ：

{"runoob":"\u83dc\u9e1f\u6559\u7a0b","taobao":"\u6dd8\u5b9d\u7f51"}
{"runoob":" Novice tutorial ","taobao":" TaoBao "}

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json_decode

PHP json_decode() Function is used for JSON Format of the string , And converted to PHP Variable .

grammar

mixed json_decode ($json_string [,$assoc = false [, $depth = 512 [, $options = 0 ]]])

Parameters

• json_string: To be decoded JSON character string , Must be UTF-8 Encoding data

• assoc: When the parameter is TRUE when , Will return an array ,FALSE Returns the object .

• depth: Parameter of integer type , It specifies the recursion depth

• options: Binary mask , Currently only supported JSON_BIGINT_AS_STRING .

example

The following example demonstrates how to decode JSON data ：

example

<?php
   $json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';

   var_dump(json_decode($json));
   var_dump(json_decode($json, true));
?>

The execution result of the above code is ：

object(stdClass)#1 (5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
}

array(5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
}