encode()的利用要领

1.json_decode()

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

json_decode — 对 JSON 名目标字符串举办编码

说明
mixed json_decode ( string $json [, bool $assoc ] )
接管一个 JSON 名目标字符串而且把它转换为 PHP 变量

参数

json
待解码的 json string 名目标字符串。

assoc
当该参数为 TRUE 时,将返回 array 而非 object 。


返回值
Returns an object or if the optional assoc parameter is TRUE, an associative array is instead returned.

典型

Example #1 json_decode() 的例子

复制代码 代码如下:


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


上例将输出:

复制代码 代码如下:


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)
}


复制代码 代码如下:


$data='[{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""}]';
echo json_decode($data);


功效为:

复制代码 代码如下:


Array ( [0] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) )


可以看出颠末json_decode()编译出来的是工具,此刻输出json_decode($data,true)试下

复制代码 代码如下:


echo json_decode($data,true);


功效:

复制代码 代码如下:


Array ( [0] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) )


可以看出 json_decode($data,true)输出的一个关联数组,由此可知json_decode($data)输出的是工具,而json_decode("$arr",true)是把它强制生成PHP关联数组.

2.json_encode()

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

json_encode — 对变量举办 JSON 编码

Report a bug 说明
string json_encode ( mixed $value [, int $options = 0 ] )
返回 value 值的 JSON 形式

Report a bug 参数

value
待编码的 value ,除了resource 范例之外,可觉得任何数据范例

该函数只能接管 UTF-8 编码的数据

options
由以下常量构成的二进制掩码: 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_UNESCAPED_UNICODE.

Report a bug 返回值
编码乐成则返回一个以 JSON 形式暗示的 string 可能在失败时返回 FALSE 。

Report a bug 更新日志
版本 说明
5.4.0 options 参数增加常量: JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, 和 JSON_UNESCAPED_UNICODE。
5.3.3 options 参数增加常量:JSON_NUMERIC_CHECK。
5.3.0 增加 options 参数.


Report a bug 典型

Example #1 A json_encode() 的例子

复制代码 代码如下:


<?php
$arr = array ('a'=>1,'b'=>2,'c'=>3,'d'=>4,'e'=>5);

echo json_encode($arr);
?>


以上例程会输出:

复制代码 代码如下:


{"a":1,"b":2,"c":3,"d":4,"e":5}


Example #2 json_encode() 函数中 options 参数的用法

复制代码 代码如下:


<?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";
?>


以上例程会输出:

复制代码 代码如下:

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