MySQLI query result (multi-lines) to JSON in PHP - php

Question

I can not manage to see all the lines of my mysql query result returned as JSON Object using JSON_encode() php function.
Here is my code :
$Sql_Query = "SELECT * FROM Users";
$result = mysqli_query($dbc,$Sql_Query);
$ligne = array();
$bilan = array();
while ($rowr = mysqli_fetch_assoc($result)) {
$ligne = array (
"User_ID" => $rowr['User_ID']
);
$bilan[$ligne['User']] = $ligne[[
['User_ID'][$rowr['User_ID']]
]];
array_push($bilan, $ligne);
}
echo json_encode($bilan, JSON_FORCE_OBJECT);
It returns me :
{"":null,"0":{"User_ID":"1"},"1":{"User_ID":"19"},"2":{"User_ID":"78"},"3":{"User_ID":"79"},"4":{"User_ID":"85"},"5":{"User_ID":"86"},"6":{"User_ID":"87"},"7":{"User_ID":"88"},"8":{"User_ID":"91"},"9":{"User_ID":"92"},"10":{"User_ID":"93"},"11":{"User_ID":"94"},"12":{"User_ID":"95"},"13":{"User_ID":"96"},"14":{"User_ID":"97"},"15":{"User_ID":"98"},"16":{"User_ID":"99"},"17":{"User_ID":"100"},"18":{"User_ID":"101"},"19":{"User_ID":"102"},"20":{"User_ID":"103"},"21":{"User_ID":"104"},"22":{"User_ID":"105"},"23":{"User_ID":"106"},"24":{"User_ID":"107"},"25":{"User_ID":"108"},"26":{"User_ID":"109"},"27":{"User_ID":"110"},"28":{"User_ID":"111"},"29":{"User_ID":"112"},"30":{"User_ID":"113"},"31":{"User_ID":"114"},"32":{"User_ID":"115"},"33":{"User_ID":"116"}}
Now, I am trying to associate the other fields of each record in the json output. But when adding this to me code, there is no more output.
while ($rowr = mysqli_fetch_assoc($result)) {
$ligne = array (
"User_ID" => $rowr['User_ID'],
"User_Nom" => $rowr['User_Nom']
);
$bilan[$ligne['User']] = $ligne[[
['User_ID'][$rowr['User_ID']]
][
['User_Nom'][$rowr['User_Nom']]
]];
array_push($bilan, $ligne);
}
echo json_encode($bilan, JSON_FORCE_OBJECT);
It seems like on numerical values can be displayed and not alpha characters.
Please help me mixing in the same output both numerical and alpha contents.
Thanks
Arnaud

Answer 1

$ligne['User'] is not initialised, could you try this:
while ($rowr = mysqli_fetch_assoc($result)) {
$ligne = array (
"User_ID" => $rowr['User_ID'],
"User_Nom" => $rowr['User_Nom']
);
array_push($bilan, $ligne);
}
echo json_encode($bilan, JSON_FORCE_OBJECT);
I tested it with this code
$result[] = ['User_ID' => 1, 'User_Nom' => 'Nom1'];
$result[] = ['User_ID' => 2, 'User_Nom' => 'Nom2'];
$result[] = ['User_ID' => 3, 'User_Nom' => 'Nom3'];
$bilan = [];
while ($rowr = array_pop($result)) {
$ligne = array (
"User_ID" => $rowr['User_ID'],
"User_Nom" => $rowr['User_Nom']
);
array_push($bilan, $ligne);
}
echo json_encode($bilan, JSON_FORCE_OBJECT);
It provides this result:
{"0":{"User_ID":3,"User_Nom":"Nom3"},"1":{"User_ID":2,"User_Nom":"Nom2"},"2":{"User_ID":1,"User_Nom":"Nom1"}}
Note the result has a different start, it does not contain
"":null,
any more. This was the result of the strange $bilan[undefined] = undefined line

Answer 2

Converted to PHP >= 5.5 for clarity.
I am guessing and making assumptions, but what else can I do? The main issue I see is that you may be tripping over your feet with the array syntax. It appears that you want to re-index the results by 'User_ID', which I assume is some string identifier found in each table record.
Modularized, in the procedural form ...
/*
Assuming you are attempting to re-index by the 'User_ID' field
of each record before encoding as JSON.
*/
function getDb($ip, $user, $password, $database) {
$db = mysqli_connect($ip, $user, $password, $database);
//error checking etc ...
return $db;
}
function selectRecords(mysqli $db, $sql) {
$result = mysqli_query($db, $sql);
if (!$result) {
throw new UnexpectedValueException("Database query (read) was unsuccessful!");
}
return $result;
}
function getUserRecords(mysqli $db) {
$query = 'SELECT * FROM Users';
return selectRecords($db, $query);
}
function reindexByField($newIndex, $userResults) {
$reindexed = [];
while ($row = mysqli_fetch_assoc($userResults)) {
if (!isset($row[$newInded])) {
throw new OutofBoundsException("The index '" . $newIndex . "' does not exist in the tested record");
}
$redindexed[$row[$newIndex]] = $row;
}
return $reindexed;
}
function getJsonFromArray(array $records) {
$json = json_encode($records, JSON_FORCE_OBJECT);
if (!$json) {
throw new UnexpectedValueException("Records were not encoded into a JSON formatted string. Got boolean false, instead.");
}
return $json;
}
In the procedural form, then ...
try {
$db = getDb($ip, $user, $password, $db); // Just pretend for a moment.
echo getJsonFromArray(reindexByField('User_ID', getUserRecords($db));
} catch (e) {
// Your handler code here.
} finally {
mysqli_close($db);
}
An object-oriented approach can make your code more organized.

Answer 3

You're right, since the orginal clean plan, because it was not working, I made too many modifications which finally added complexity where there is no need...
I found in php doc the possibility to learn more about the error generated when adding the other fields in the json conversion. json_last_error() was the key for understanding the issue.
So I added :
switch (json_last_error()) {
case JSON_ERROR_NONE:
echo ' - Aucune erreur';
break;
case JSON_ERROR_DEPTH:
echo ' - Profondeur maximale atteinte';
break;
case JSON_ERROR_STATE_MISMATCH:
echo ' - Inadéquation des modes ou underflow';
break;
case JSON_ERROR_CTRL_CHAR:
echo ' - Erreur lors du contrôle des caractères';
break;
case JSON_ERROR_SYNTAX:
echo ' - Erreur de syntaxe ; JSON malformé';
break;
case JSON_ERROR_UTF8:
echo ' - Caractères UTF-8 malformés, probablement une erreur d\'encodage';
break;
default:
echo ' - Erreur inconnue';
break;
}
This returns me a UTF-8 encoding issue. So I modified my code adding some
utf8_encode($rowr['Fieldname'])
First working solution is very near from #PaulH one's, just, in my specific case, I definetely have to add (utf8_encode()) statement :
$Sql_Query = "SELECT * FROM Users";
$result = mysqli_query($dbc,$Sql_Query);
$ligne =array();
$bilan = array();
while ($rowr = mysqli_fetch_assoc($result)) {
$ligne = array ("User_ID" => $rowr['User_ID'],
"User_Nom" => utf8_encode($rowr['User_Nom']),
"User_Prenom" =>utf8_encode($rowr['User_Prenom']));
array_push ($bilan, $ligne);
}
echo json_encode($bilan, JSON_FORCE_OBJECT);
and it now displays all the fields, all the lines. But there were still some "é" transformed to "\u00e9". So this post put the final brick to the solution.
I modified :
JSON_FORCED_OBJECT
to
JSON_UNESCAPED_UNICODE
as json_encode() parameter.
Finally, code delivering exactly what I want is the following :
$Sql_Query = "SELECT * FROM Users";
$result = mysqli_query($dbc,$Sql_Query);
$bilan = array();
while ($rowr = mysqli_fetch_assoc($result)) {
$ligne = array ("User_ID" => $rowr['User_ID'],
"User_Nom" => utf8_encode($rowr['User_Nom']),
"User_Prenom" =>utf8_encode($rowr['User_Prenom']));
array_push ($bilan, $ligne);
}
echo json_encode($bilan, JSON_UNESCAPED_UNICODE);