json_encode
Returns the JSON representation of a value
&reftitle.description;
stringjson_encode
mixedvalue
intoptions0
Returns a string containing the JSON representation of
value.
&reftitle.parameters;
value
The value being encoded. Can be any type except
a resource.
This function only works with UTF-8 encoded data.
options
Bitmask consisting of JSON_HEX_QUOT,
JSON_HEX_TAG,
JSON_HEX_AMP,
JSON_HEX_APOS,
JSON_FORCE_OBJECT.
&reftitle.returnvalues;
Returns a JSON encoded string on success.
&reftitle.changelog;
&Version;
&Description;
5.3.0
The options parameter was added.
5.2.1
Added support for JSON encoding of basic types.
&reftitle.examples;
A <function>json_encode</function> example
1,'b'=>2,'c'=>3,'d'=>4,'e'=>5);
echo json_encode($arr);
?>
]]>
&example.outputs;
A <function>json_encode</function> example showing all the options in action
',"'bar'",'"baz"','&blong&');
echo "Normal: ", json_encode($a), "\n";
echo "Tags: ", json_encode($a,JSON_HEX_TAG), "\n";
echo "Apos: ", json_encode($a,JSON_HEX_APOS), "\n";
echo "Quot: ", json_encode($a,JSON_HEX_QUOT), "\n";
echo "Amp: ", json_encode($a,JSON_HEX_AMP), "\n";
echo "All: ", json_encode($a,JSON_HEX_TAG|JSON_HEX_APOS|JSON_HEX_QUOT|JSON_HEX_AMP), "\n\n";
$b = array();
echo "Empty array output as array: ", json_encode($b), "\n";
echo "Empty array output as object: ", json_encode($b, JSON_FORCE_OBJECT), "\n\n";
$c = array(array(1,2,3));
echo "Non-associative array output as array: ", json_encode($c), "\n";
echo "Non-associative array output as object: ", json_encode($c, JSON_FORCE_OBJECT), "\n\n";
$d = array('foo' => 'bar', 'baz' => 'long');
echo "Associative array always output as object: ", json_encode($d), "\n";
echo "Associative array always output as object: ", json_encode($d, JSON_FORCE_OBJECT), "\n\n";
?>
]]>
&example.outputs;
","'bar'","\"baz\"","&blong&"]
Tags: ["\u003Cfoo\u003E","'bar'","\"baz\"","&blong&"]
Apos: ["","\u0027bar\u0027","\"baz\"","&blong&"]
Quot: ["","'bar'","\u0022baz\u0022","&blong&"]
Amp: ["","'bar'","\"baz\"","\u0026blong\u0026"]
All: ["\u003Cfoo\u003E","\u0027bar\u0027","\u0022baz\u0022","\u0026blong\u0026"]
Empty array output as array: []
Empty array output as object: {}
Non-associative array output as array: [[1,2,3]]
Non-associative array output as object: {"0":{"0":1,"1":2,"2":3}}
Associative array always output as object: {"foo":"bar","baz":"long"}
Associative array always output as object: {"foo":"bar","baz":"long"}
]]>
&reftitle.notes;
In the event of a failure to encode, json_last_error
can be used to determine the exact nature of the error.
&reftitle.seealso;
json_decode
json_last_error