Question

I’m really stuck trying to resolve what should be quite simple.

I Have this

<?php 

$json = json_decode('{
                      "33540116":
                                 {"person":
                                           {"name":"John", "age":"36"}},
                      "33541502":
                                 {"person":                                                                                      
                                           {"name":"Jack", "age":"23"}}
                     }
        ');

 $id = array('33540116', '33541502');


foreach($id as $id) {

        echo $json->$id->person->{'name'}. '<br />';
        echo $json->$id->person->{'age'}. '<br />';


        }
?>

So the code is decoding a json string then using foreach to echo each result.

This json file is rather large and I’m only interested in certain records that match the id’s stored in a mysql table.

To do this I have replaced the id array string above with mysql select statement.

<?php
$json = json_decode('{
                      "33540116":
                                 {"person":
                                           {"name":"John", "age":"36"}},
                      "33541502":
                                 {"person":                                                                                      
                                           {"name":"Jack", "age":"23"}}
                     }
        ');

$result = mysql_query("SELECT id FROM people");
$row = mysql_fetch_array($result);

$id = array($row['id']);

foreach($id as $id) {

            echo $json->$id->person->{'name'}. '<br />';
            echo $json->$id->person->{'age'}. '<br />';


            }
?>

Although this works, it only gives me 1 result.
What I really need is to loop through the results.
Unfortunately I don’t know how to construct a while loop together with foreach.

I will greatly appreciate your assistance.

UPDATE (extra question)

Thanks everyone. You have helped me solve the problem.

However, I have another question that relates to this matter.

I mentioned above that I merely wanted to echo the results.
But this isn’t exactly true.
What I really want to do is update the same mysql table with the results retreived from the json file.

I have a table called people with fields id, name and age.

How can I update this table with these results?

Thanks again.

Answer 1

mysql_fetch_array only fetches one row at a time. You can use a while loop to continue fetching rows. The mysql_fetch_array function returns false once the whole result set has been fetched, so that will cause the while loop to terminate as desired.

Also, I removed the foreach loop on $ids. Since there will only be one element in the array it’s unnecessary to put the code in a loop.

<?php
$json = json_decode('{
                      "33540116":
                                 {"person":
                                           {"name":"John", "age":"36"}},
                      "33541502":
                                 {"person":                                                                                      
                                           {"name":"Jack", "age":"23"}}
                     }
        ');

$result = mysql_query("SELECT id FROM people");

while ( ( $row = mysql_fetch_array($result) ) ) {
    $id = $row['id'];

    echo $json->$id->person->{'name'}. '<br />';
    echo $json->$id->person->{'age'}. '<br />';
}

?>