Grouping JSON output according to specific mysql column - php

Question

I have a mysql table (name:"messages") that has three columns as below:
messageID, fromUserID, content
I wish to have a json output using php script like following format; I need to seprate messages of each user (fromUserID column).
JSONOutput:
{
"newCount":"x",
"messages":
[
{
"fromUserID":"x",
"messagesArray":
[
{"messageID":"x","content":"xxx"},
{"messageID":"x","content":"xxx"},
{"messageID":"x","content":"xxx"}
]
},
{
"fromUserID":"y",
"messagesArray":
[
{"messageID":"x","content":"xxx"},
{"messageID":"x","content":"xxx"},
{"messageID":"x","content":"xxx"}
]
},
{
"fromUserID":"z",
"messagesArray":
[
{"messageID":"x","content":"xxx"},
{"messageID":"x","content":"xxx"},
{"messageID":"x","content":"xxx"}
]
}
]
}
My PHP Script:
$query = mysqli_query($con,"SELECT * FROM messages ORDER BY fromUserID");
$outputArray = array();
$outputArray['hasNew'] = mysqli_num_rows($query);
$messagesArray = array();
if($query)
{
while($row = mysqli_fetch_assoc($query))
{
$MSGArray = array();
$messagesArray['fromUserID'] = $row['fromUserID'];
$MSGArray['messageID'] = $row['messageID'];
$MSGArray['content'] = $row['content'];
$messagesArray['MessagesArray'][] = $MSGArray;
}
$outputArray['Messages'][] = $messagesArray;
}
echo json_encode($outputArray);
But with above script I give a wrong result as below:
{
"hasNew":6,
"Messages":
[
{
"fromUserID":"24",
"MessagesArray":
[
{"messageID":"4","content":"test"},
{"messageID":"3","content":"test"},
{"messageID":"6","content":"test"},
{"messageID":"5","content":"test"},
{"messageID":"1","content":"test"},
{"messageID":"2","content":"test"}
]
}
]
}
My PHP Script just using last fromUserID value to grouping messages !!!
Please let me know where I'm wrong ...

Answer 1

Try it
if($query)
{
while($row = mysqli_fetch_assoc($query))
{
$MSGArray = array();
$messagesArray[$row['fromUserID']]['fromUserID'] = $row['fromUserID'];
$MSGArray['messageID'] = $row['messageID'];
$MSGArray['content'] = $row['content'];
$messagesArray[$row['fromUserID']]['MessagesArray'][] = $MSGArray;
}
foreach($messagesArray as $value) {
$outputArray['Messages'][] = $value;
}
}