Parsing json in PHP, how to solve

Parsing json in PHP
I get a JSON string from a page and then convert it to a JSON array and then insert it into the database, but all that is inserted is NULL, and I'm sure I can get to the JSON string.
Include_once (' inc/conn.php ');
$json _string=$_request["Visitor"];
$addressInfo =json_decode ($json _string,true);
$name = $addressInfo [' name '];
$idcard = $addressInfo [' IDCRD '];
$visitedphone = $addressInfo [' Visitedphone '];
$address = $addressInfo [' Address '];
$visitedorganization = $addressInfo [' visitedorganization '];
echo "1$visitedphone";
echo "2$address";
echo "3$visitedorganization";
$sql = "INSERT into Adress_list (name,idcrad,tel,adress,visitorganization) VALUES (' $name ', ' $idcard ', ' $visitedphone ', ' $address ', ' $visitedorganization '); ";
$rest = 0;
$rest = mysql_query ($sql);
Echo Mysql_error ();
if ($rest) {
echo "Congratulations, upload success!";
}else{
echo "Upload failed, please re-upload!";
}
Close the database
Mysql_close ($con);

?>
This is my code to seek the Great God Guide, urgent beg ...
------Solution--------------------
$name = $addressInfo [' Visitors '][0][' name ']; That's fine.
------Solution--------------------
One less layer of foreach, and you'll see.
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It should be written.
$addressInfo =json_decode ($json _string,true);
$addressInfo =[' visitors '][0];
It's your original code.

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