php如何修改json中指定的值

php修改json中指定的值

<?php
header("content-type:text/html;charset=utf-8");
$postid=$_REQUEST['postid'];
$url ="";
 $ch = curl_init();
 //设置选项，包括URL
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_HEADER, 0);
 //执行并获取HTML文档内容
 $output = curl_exec($ch);
$arr = json_decode($output,true);
 $getcom=$arr['auto'][0]['comCode'];
include_once("kuaidi_config.php");
$url ="";
 //设置选项，包括URL
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_HEADER, 0);
 //执行并获取HTML文档内容
 $output = curl_exec($ch);
 //释放curl句柄
 curl_close($ch);
$obj=json_decode($output, true);
foreach($obj as $key=>$value){
$obj['com']="中通";
}
echo json_encode($obj);
?>

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