PHP Array to JSON - php

Question

I'm trying to build a JSON object from a mysql query. The JSON structure that I'm striving for should look like this:
{
"a": [
{
"user": "alb",
"time": "2011-09-12 05:56:36"
},
{
"user": "arg",
"time": "2011-09-12 05:56:36"
}
]
"b": [
{
"user": "blah",
"time": "2011-09-12 05:56:36"
},
{
"user": "bleh",
"time": "2011-09-12 05:56:36"
}
]
}
However, my code always returns a JSON object wrapped in an array like so:
[
{
"a": [
{
"user": "alb",
"time": "2011-09-12 05:56:36"
},
{
"user": "arg",
"time": "2011-09-12 05:56:36"
}
]
"b": [
{
"user": "blah",
"time": "2011-09-12 05:56:36"
},
{
"user": "bleh",
"time": "2011-09-12 05:56:36"
}
]
}
]
Here is the php code I'm using:
<?php
$json_data = array();
foreach($blogs as $blog)
{
$sql = "SELECT * from users";
$query = mysql_query($sql);
$ablog = array();
while ($row = mysql_fetch_assoc($query))
{
$json_element = array(
"user"=> $row[username] ,
"time"=> $row[time]
);
array_push($ablog,$json_element);
}
$eblog = array($blog => $ablog);
array_push($json_data,$eblog);
}
$json_output = json_encode($json_data);
print $json_output;
?>
I was wondering: Why am I getting a JSON object wrapped in an array? What am I doing incorrectly in the code above?
Thank you.

Answer 1

The following two lines are creating one-element associative arrays and appending the one-element array to your larger $json_data array:
$eblog = array($blog => $ablog);
array_push($json_data,$eblog);
Instead, just add a new key/value pair to your original array:
$json_data[$blog] = $ablog;