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”;
?>

以上例程会输出：

代码如下:

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&”,”é”]
All: [“\u003Cfoo\u003E”,”\u0027bar\u0027″,”\u0022baz\u0022″,”\u0026blong\u0026″,”é”]

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 连续与非连续数组示例

代码如下:

<?php
echo “连续数组”.PHP_EOL;
$sequential = array(“foo”, “bar”, “baz”, “blong”);
var_dump(
$sequential,
json_encode($sequential)
);

echo PHP_EOL.”非连续数组”.PHP_EOL;
$nonsequential = array(1=>”foo”, 2=>”bar”, 3=>”baz”, 4=>”blong”);
var_dump(
$nonsequential,
json_encode($nonsequential)
);

echo PHP_EOL.”删除一个连续数组值的方式产生的非连续数组”.PHP_EOL;
unset($sequential[1]);
var_dump(
$sequential,
json_encode($sequential)
);
?>

以上例程会输出：

代码如下:

连续数组
array(4) {
[0]=>
string(3) “foo”
[1]=>
string(3) “bar”
[2]=>
string(3) “baz”
[3]=>
string(5) “blong”
}
string(27) “[“foo”,”bar”,”baz”,”blong”]”

非连续数组
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”}”

删除一个连续数组值的方式产生的非连续数组
array(3) {
[0]=>
string(3) “foo”
[2]=>
string(3) “baz”
[3]=>
string(5) “blong”
}
string(33) “{“0″:”foo”,”2″:”baz”,”3″:”blong”}”

代码如下:

$obj->Name= ‘a1′;$obj->Number =’123’;
$obj->Contno= ‘000’;
echo json_encode($obj);

结果为：

代码如下:

{“Name”:”a1″,
“Number”:”123″,
“Contno”:”000″
}

可以看出json_encode()和json_decode()是编译和反编译过程，注意json只接受utf-8编码的字符，所以json_encode()的参数必须是utf-8编码，否则会得到空字符或者null。