loop through multidimensional array in php - php

Question

some time small things in programming get giants. I am working on 2 dimensional array but I am unable to get what I need.
below is my array structure.
Array
(
[0] => Array
(
[0] => 16
[id] => 16
[1] => 1
[userid] => 1
[2] => abc#gmail.com
[email] => abc#gmail.com
[3] => dffsdf
[message] => dffsdf
[4] => 0
[status] => 0
)
[1] => Array
(
[0] => 17
[id] => 17
[1] => 1
[userid] => 1
[2] => xyz#gmail.comnnn
[email] => xyz#gmail.comnnn
[3] => dffsdfnnnnnnnnnnn
[message] => dffsdfnnnnnnnnnnn
[4] => 0
[status] => 0
)
)
what I am doing here is getting the messages for a user with some id. I am doing it like that
if($get_mails[0]['userid'] == $_GET['userid'])
{
$last_key = end(array_keys($get_mails));
echo '{"Messages":[';
foreach($get_mails as $key => $get_each_mail){
$company_name = $get_each_mail['company_name'];
$email_id = $get_each_mail['id'];
$email_body = $get_each_mail['message'];
}
echo '{"CompanyName":"'.$company_name.'","MessageID":"'.$email_id.'","MessageBody":"'.$email_body.'"';
if ($key == $last_key)
{
echo '}]}';
}else{
echo'},';
}
}
what I am unable to do is so funny that I need a loop for [0] in this line of code
if($get_mails[0]['userid'] == $_GET['userid'])
like
if($get_mails[i]['userid'] == $_GET['userid']) and it give me all the records against specific user.
here is what I want to get for a specific user
{"Messages":[{"CompanyName":"newtech","MessageID":"14","MessageBody":"hi how are you"},{"CompanyName":"newtech","MessageID":"15","MessageBody":"hi how are you"},{"CompanyName":"newtech","MessageID":"24","MessageBody":"asfasdfsdfsdfsdfsdfsdfsdfsd"}]}
respose like that, it will add more and more if more records would available against specific user.

Answer 1

Assuming $get_mails contains the Array you posted above (including company_name), you can write something like this:
$output = Array( "Messages" => Array() );
foreach( $get_mails as $k => $arr ) {
$t = Array();
$t['CompanyName'] = $arr['company_name'];
$t['MessageID'] = $arr['id'];
$t['MessageBody'] = $arr['message'];
$output['Messages'][] = $t;
}
echo json_encode( $output );
First you prepare an Array with the structure of your JSON. The syntax $array[] = a will append a to $array. json_encode( ... ) at the end will take care of turning it into valid JSON, even if one of your keys included a quote or other special character that is invalid in JSON.
I believe you only want to display messages from a certain user, and try to accomplish that with if($get_mails[0]['userid'] == $_GET['userid']). I recommend to change your SQL-query to something that accomplishes that, because the performance of your page will greatly increase if you try to crawl through all messages with the following code:
$output = Array( "Messages" => Array() );
foreach( $get_mails as $k => $arr ) {
if( $arr['user_id'] == $_GET['userid'] ) {
$t = Array();
$t['CompanyName'] = $arr['company_name'];
$t['MessageID'] = $arr['id'];
$t['MessageBody'] = $arr['message'];
$output['Messages'][] = $t;
}
}
echo json_encode( $output );