PHP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:
var_dump(json_decode($json));
var_dump(json_decode($json,true));
输出:
["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)
}
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。
$web=json_decode($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。
$web=json_decode($s);
echo json_encode($web);
?>
二 .PHP JSON 转数组
$web=json_decode($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,
$web=json_decode($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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