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HomeBackend DevelopmentPHP TutorialPHP针对JSON操作实例分析_php技巧

本文实例分析了PHP针对JSON操作。分享给大家供大家参考。具体分析如下:

由于JSON可以在很多种程序语言中使用,所以我们可以用来做小型数据中转,如:PHP输出JSON字符串供JavaScript使用等。在PHP中可以使用 json_decode() 由一串规范的字符串解析出 JSON对象,使用 json_encode() 由JSON 对象生成一串规范的字符串。

例:

复制代码 代码如下:
$json = '{"a":1, "b":2, "c":3, "d":4, "e":5 }';
var_dump(json_decode($json));
var_dump(json_decode($json,true));

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:
$arr = array ('a'=>1,'b'=>2,'c'=>3,'d'=>4,'e'=>5);
echo json_encode($arr);

输出:{"a":1,"b":2,"c":3,"d":4,"e":5}

1. json_decode(),字符转JSON,一般用在接收到Javascript 发送的数据时会用到。

复制代码 代码如下:
$s='{"webname":"homehf","url":"www.homehf.com","contact":{"qq":"123456789","mail":"nieweihf@163.com","xx":"xxxxxxx"}}';
$web=json_decode($s);
echo '网站名称:'.$web->webname.'
网址:'.$web->url.'
联系方式:QQ-'.$web->contact->qq.' MAIL:'.$web->contact->mail;
?>

上面的例子中,我们首先定义了一个变量s,然后用json_decode()解析成JSON对象,之后可以按照JSON的方式去使用,从使用情况看,JSON和XML以及数组实现的功能类似,都可以存储一些相互之间存在关系的数据,但是个人觉得JSON更容易使用,且可以使用JSON和JavaScript实现数据共享。

2. json_encode(),JSON转字符,这个一般在AJAX 应用中,为了将JSON对象转化成字符串并输出给 Javascript 时会用到,而向数据库中存储时也会用到。

复制代码 代码如下:
$s='{"webname":"homehf","url":"www.homehf.com","contact":{"qq":"123456789","mail":"nieweihf@163.com","xx":"xxxxxxx"}}';
$web=json_decode($s);
echo json_encode($web);
?>

二 .PHP JSON 转数组

复制代码 代码如下:
$s='{"webname":"homehf","url":"www.homehf.com","qq":"123456789"}';
$web=json_decode($s); //将字符转成JSON
$arr=array();
foreach($web as $k=>$w) $arr[$k]=$w;
print_r($arr);
?>

上面的代码中,已经将一个JSON对象转成了一个数组,可是如果是嵌套的JSON,上面的代码显然无能为力了,那么我们写一个函数解决嵌套JSON,

复制代码 代码如下:
$s='{"webname":"homehf","url":"www.homehf.com","contact":{"qq":"123456789","mail":"nieweihf@163.com","xx":"xxxxxxx"}}';
$web=json_decode($s);
$arr=json_to_array($web);
print_r($arr);

function json_to_array($web){
$arr=array();
foreach($web as $k=>$w){
    if(is_object($w)) $arr[$k]=json_to_array($w); //判断类型是不是object
    else $arr[$k]=$w;
}
return $arr;
}
?>

希望本文所述对大家的php程序设计有所帮助。

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