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PHP:json_decode()的用法_JSON函数(php json)
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(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 = [, int $options = 0 ]]] )接受一个 JSON 格式的字符串并且把它转换为 PHP 变量
参数json
待解码的 json string 格式的字符串。
This function only works with UTF-8 encoded data.
assoc当该参数为 TRUE 时，将返回 array 而非 object 。
depthUser specified recursion depth.
optionsBitmask of JSON decode options. Currently only JSON_BIGINT_AS_STRING is supported (default is to cast large integers as floats)
返回值Returns the value encoded in json in appropriate PHP type. Values true, false and null (case-insensitive) are returned as TRUE, FALSE and NULL respectively. NULL is returned if the json cannot be decoded or if the encoded data is deeper than the recursion limit.
范例
Example #1 json_decode() 的例子
<?php$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：
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.
<?php$json='{"foo-bar":}';$obj=json_decode($json);print$obj->{'foo-bar'};//?>Example #3 common mistakes using json_decode()
<?php//thefollowingstringsarevalidJavaScriptbutnotvalidJSON//thenameandvaluemustbeenclosedindoublequotes//singlequotesarenotvalid$bad_json="{'bar':'baz'}";json_decode($bad_json);//null//thenamemustbeenclosedindoublequotes$bad_json='{bar:"baz"}';json_decode($bad_json);//null//trailingcommasarenotallowed$bad_json='{bar:"baz",}';json_decode($bad_json);//null?>Example #4 depth errors
<?php//Encodethedata.$json=json_encode(array(1=>array('English'=>array('One','January'),'French'=>array('Une','Janvier'))));//Definetheerrors.$constants=get_defined_constants(true);$json_errors=array();foreach($constants["json"]as$name=>$value){if(!strncmp($name,"JSON_ERROR_",)){$json_errors[$value]=$name;}}//Showtheerrorsfordifferentdepths.foreach(range(4,3,-1)as$depth){var_dump(json_decode($json,true,$depth));echo'Lasterror:',$json_errors[json_last_error()],PHP_EOL,PHP_EOL;}?>以上例程会输出：
Example #5 json_decode() of large integers
<?php$json='';var_dump(json_decode($json));var_dump(json_decode($json,false,,JSON_BIGINT_AS_STRING));?>以上例程会输出：
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 to 5.2.3 The nesting limit was increased from to 5.2.1 Added support for JSON decoding of basic types.
参见json_encode() - 对变量进行 JSON 编码 json_last_error() - 返回最后发生的错误
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