json_decode

(PHP 5 >= 5.2.0, PECL json >= 1.2.0)

json_decode — 对 JSON 格式的字符串进行编码

说明 ¶

mixed json_decode ( string $json [, bool $assoc = false [, int $depth = 512 [, int $options = 0 ]]] )

接受一个 JSON 格式的字符串并且把它转换为 PHP 变量

参数 ¶

json

待解码的 json string 格式的字符串。

This function only works with UTF-8 encoded data.

assoc

当该参数为 TRUE 时，将返回 array 而非 object 。

depth

User specified recursion depth.（递归深度）

options

Bitmask of JSON decode options. Currently only JSON_BIGINT_AS_STRING is supported (default is to cast large integers as floats)（目前只支持JSON_BIGINT_AS_STRING，默认是将大整数强制转换为浮点数。）

返回值 ¶

Returns the value encoded in json in appropriate PHP type. Values true, false and null (case-insensitive) are returned as TRUE, FALSE and NULL respectively. NULL is returned if the json cannot be decoded or if the encoded data is deeper than the recursion limit.

范例 ¶

Example #1 json_decode() 的例子

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

?>

以上例程会输出：

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)
}

Example #2 Accessing invalid object properties

Accessing elements within an object that contain characters not permitted under PHP’s naming convention (e.g. the hyphen) can be accomplished by encapsulating the element name within braces and the apostrophe.（当访问对象的元素时，如果元素名是字符串，需要用大扩号和但引号扩起来）

<?php
 $json = '{"foo-bar": 12345}';
 $obj = json_decode($json);
 print $obj->{
        'foo-bar'}; // 12345

?>

Example #3 common mistakes using json_decode()

<?php
 // the following strings are valid JavaScript but not valid JSON
 // the name and value must be enclosed in double quotes
 // single quotes are not valid 
 $bad_json = "{ 'bar': 'baz' }";
 json_decode($bad_json); // null
 // the name must be enclosed in double quotes
 $bad_json = '{ bar: "baz" }';
 json_decode($bad_json); // null
 // trailing commas are not allowed
 $bad_json = '{ bar: "baz", }';
 json_decode($bad_json); // null

?>

Example #4 depth errors

<?php
 // Encode the data.
 $json = json_encode(
     array(
         1 => array(
             'English' => array(
                 'One',
                 'January'
             ),
             'French' => array(
                 'Une',
                 'Janvier'
             )
         )
     )
 );
 // Define the errors.
 $constants = get_defined_constants(true);
 $json_errors = array();
 foreach ($constants["json"] as $name => $value) {
        
     if (!strncmp($name, "JSON_ERROR_", 11)) {
        
         $json_errors[$value] = $name;
     }
 }

// Show the errors for different depths. foreach (range(4, 3, -1) as $depth) { var_dump(json_decode($json, true, $depth)); echo 'Last error: ', $json_errors[json_last_error()], PHP_EOL, PHP_EOL; } ?>

以上例程会输出：

array(1) {
  [1]=>
  array(2) {
    ["English"]=>
    array(2) {
      [0]=>
      string(3) "One"
      [1]=>
      string(7) "January"
    }
    ["French"]=>
    array(2) {
      [0]=>
      string(3) "Une"
      [1]=>
      string(7) "Janvier"
    }
  }
}
Last error: JSON_ERROR_NONE

NULL
Last error: JSON_ERROR_DEPTH

Example #5 json_decode() of large integers

<?php
 $json = '12345678901234567890';
 
 var_dump(json_decode($json));
 var_dump(json_decode($json, false, 512, JSON_BIGINT_AS_STRING));
 
 ?>

以上例程会输出：

float(1.2345678901235E+19)
string(20) "12345678901234567890"

注释 ¶

Note:

The JSON spec is not JavaScript, but a subset of JavaScript.

Note:

In the event of a failure to decode, json_last_error() can be used to determine the exact nature of the error.

更新日志 ¶

版本	说明
5.4.0	The `options` parameter was added.
5.3.0	Added the optional `depth`. The default recursion depth was increased from 128 to 512
5.2.3	The nesting limit was increased from 20 to 128
5.2.1	Added support for JSON decoding of basic types.