(PHP 5 >= 5.2.0, PHP 7, PECL json >= 1.2.0)
json_encode — �Ա������� JSON ����
�����ַ����������� value ֵ JSON ��ʽ�ı�ʾ��
�����ܴ���� options ����Ӱ�죬���⸡��ֵ�ı��������� serialize_precision��
value
������� value ������resource
����֮�⣬����Ϊ�κ��������͡�
�����ַ������ݵı�������� UTF-8��
Note:
PHP implements a superset of JSON as specified in the original » RFC 7159.
options
�����³�����ɵĶ��������룺 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��
���� JSON ��������ο�JSON ����ҳ�档
depth���������ȡ� �������0��
�ɹ��� JSON ����� string ������ʧ��ʱ���� FALSE ��
| �汾 | ˵�� |
|---|---|
| 7.1.0 | �� Double ��ֵ���б���ʱ��ʹ�� serialize_precision ���� precision�� |
| 5.6.6 |
options �������ӳ�����
JSON_PRESERVE_ZERO_FRACTION
|
| 5.5.0 |
���� depth ������
|
| 5.5.0 |
������ JSON_PARTIAL_OUTPUT_ON_ERROR ѡ�
|
| 5.5.0 |
ʧ��ʱ���ص�ֵ�� null �ַ����ij� FALSE��
|
| 5.4.0 |
options �������ӳ�����
JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, �� JSON_UNESCAPED_UNICODE��
|
| 5.3.3 |
options �������ӳ�����JSON_NUMERIC_CHECK��
|
| 5.3.0 |
���� options ����.
|
Example #1 json_encode() ����
<?php
$arr = array ('a'=>1,'b'=>2,'c'=>3,'d'=>4,'e'=>5);
echo json_encode($arr);
?>
�������̻������
{"a":1,"b":2,"c":3,"d":4,"e":5}
Example #2 json_encode() ������ options �������÷�
<?php
$a = array('<foo>',"'bar'",'"baz"','&blong&', "\xc3\xa9");
echo "Normal: ", json_encode($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 "Unicode: ", json_encode($a, JSON_UNESCAPED_UNICODE), "\n";
echo "All: ", json_encode($a, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE), "\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";
?>
�������̻������
Normal: ["<foo>","'bar'","\"baz\"","&blong&","\u00e9"]
Tags: ["\u003Cfoo\u003E","'bar'","\"baz\"","&blong&","\u00e9"]
Apos: ["<foo>","\u0027bar\u0027","\"baz\"","&blong&","\u00e9"]
Quot: ["<foo>","'bar'","\u0022baz\u0022","&blong&","\u00e9"]
Amp: ["<foo>","'bar'","\"baz\"","\u0026blong\u0026","\u00e9"]
Unicode: ["<foo>","'bar'","\"baz\"","&blong&","��"]
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"}
Example #3 ѡ�� JSON_NUMERIC_CHECK ����
<?php
echo "Strings representing numbers automatically turned into numbers".PHP_EOL;
$numbers = array('+123123', '-123123', '1.2e3', '0.00001');
var_dump(
$numbers,
json_encode($numbers, JSON_NUMERIC_CHECK)
);
echo "Strings containing improperly formatted numbers".PHP_EOL;
$strings = array('+a33123456789', 'a123');
var_dump(
$strings,
json_encode($strings, JSON_NUMERIC_CHECK)
);
?>
�������̵���������ڣ�
Strings representing numbers automatically turned into numbers
array(4) {
[0]=>
string(7) "+123123"
[1]=>
string(7) "-123123"
[2]=>
string(5) "1.2e3"
[3]=>
string(7) "0.00001"
}
string(28) "[123123,-123123,1200,1.0e-5]"
Strings containing improperly formatted numbers
array(2) {
[0]=>
string(13) "+a33123456789"
[1]=>
string(4) "a123"
}
string(24) "["+a33123456789","a123"]"
Example #4 ���������������ʾ��
<?php
echo "��������".PHP_EOL;
$sequential = array("foo", "bar", "baz", "blong");
var_dump(
$sequential,
json_encode($sequential)
);
echo PHP_EOL."����������".PHP_EOL;
$nonsequential = array(1=>"foo", 2=>"bar", 3=>"baz", 4=>"blong");
var_dump(
$nonsequential,
json_encode($nonsequential)
);
echo PHP_EOL."ɾ��һ����������ֵ�ķ�ʽ�����ķ���������".PHP_EOL;
unset($sequential[1]);
var_dump(
$sequential,
json_encode($sequential)
);
?>
�������̻������
��������
array(4) {
[0]=>
string(3) "foo"
[1]=>
string(3) "bar"
[2]=>
string(3) "baz"
[3]=>
string(5) "blong"
}
string(27) "["foo","bar","baz","blong"]"
����������
array(4) {
[1]=>
string(3) "foo"
[2]=>
string(3) "bar"
[3]=>
string(3) "baz"
[4]=>
string(5) "blong"
}
string(43) "{"1":"foo","2":"bar","3":"baz","4":"blong"}"
ɾ��һ����������ֵ�ķ�ʽ�����ķ���������
array(3) {
[0]=>
string(3) "foo"
[2]=>
string(3) "baz"
[3]=>
string(5) "blong"
}
string(33) "{"0":"foo","2":"baz","3":"blong"}"
Example #5 ѡ�� JSON_PRESERVE_ZERO_FRACTION ������
<?php
var_dump(json_encode(12.0, JSON_PRESERVE_ZERO_FRACTION));
var_dump(json_encode(12.0));
?>
�������̻������
string(4) "12.0" string(2) "12"
Note:
���ִ��ʧ�ܣ�����ͨ�� json_last_error() ��������ȡ��ϸ������Ϣ��
Note:
���Ҫ���������ļ����Ǵ�0��ʼ�����֣����еļ����ᱻ�����ַ���������ȷ����Ϊ key-value �ԡ�
Note:
Like the reference JSON encoder, json_encode() will generate JSON that is a simple value (that is, neither an object nor an array) if given a string, integer, float or boolean as an input
value. While most decoders will accept these values as valid JSON, some may not, as the specification is ambiguous on this point.�ܶ���֮��Ӧ�ò����� JSON decoder �ܷ��� json_encode() ���ɵ����ݡ�