convert php array to javascript literal object - php

Question

I have a php page which returns a php array as the following
array(6) {
[0]=>
array(2) {
["cityName"]=>
string(10) "Ananindeua"
[0]=>
string(10) "Ananindeua"
}
[1]=>
array(2) {
["cityName"]=>
string(8) "An�polis"
[0]=>
string(8) "An�polis"
}
[2]=>
array(2) {
["cityName"]=>
string(8) "Anderson"
[0]=>
string(8) "Anderson"
}
[3]=>
array(2) {
["cityName"]=>
string(6) "Angers"
[0]=>
string(6) "Angers"
}
[4]=>
array(2) {
["cityName"]=>
string(9) "Angoul�me"
[0]=>
string(9) "Angoul�me"
}
[5]=>
array(2) {
["cityName"]=>
string(6) "Anshan"
[0]=>
string(6) "Anshan"
}
}
I want to use this array in another page to do some ajax, and I want to encode the resulat into a JSON as the following :
{
"cityName": "Anshan",
"cityName": "Angoul�me",
"cityName": "Anderson",
"cityName": "An�polis",
"cityName": "Ananindeua"
}
but Instead I get only one value, which is the last value :
{
"cityName": "Anshan"
}
This is the code I tried :
<?php
$connexion = new PDO("mysql:host=localhost;dbname=world", 'root', 'toor');
$statement = $connexion->prepare("SELECT cityName FROM cities WHERE cityName LIKE '" . $_POST['cityName'] . "%'");
$statement->execute();
$resultats = $statement->fetchAll();
foreach($resultats as $city) {
$output[key($city)] = current($city);
}
echo json_encode($output, 128);
?>
So how can I solve this problem ?
Edit :
I tried to get only cities names, and push them into an array, when I do a var_dump() for this array this is what I get :
array(6) {
[0]=>
string(10) "Ananindeua"
[1]=>
string(8) "An�polis"
[2]=>
string(8) "Anderson"
[3]=>
string(6) "Angers"
[4]=>
string(9) "Angoul�me"
[5]=>
string(6) "Anshan"
}
But when I did a json_encode() I don't get anything, so I tried to do a var_dump(json_encode($output)); and I get this :
bool(false)
In the second time I tried to create a table manually :
$a = array("Ananindeua","Anápolis","Anderson","Angers","Angoulême","Anshan" );
and it worked.
But why the first array won't encode !

Answer 1

Your desired output is not valid/conceivable either as a PHP associative array or JSON because in both cases, you have duplicate keys.
You're just overwriting the cityName key with each iteration. Push to an array instead:
foreach($resultats as $city) {
$output[] = current($city);
}
echo json_encode($output, 128);
Output:
[
"Anshan",
"Angoulme",
"Anpolis"
]
Or if you want an object for each city, which is useful if you want other properties:
foreach($resultats as $city) {
$output[] = array(
'cityName' => current($city)
);
}
echo json_encode($output, 128);
Output:
[
{
"cityName" : "Anshan",
},
{
"cityName" : "Angoulme",
},
{
"cityName" : "Anpolis"
}
]
Side note: if you don't need the numerical keys from the PDO fetch call, consider using the PDO::FETCH_ASSOC fetch style, to bring back only associative keys:
$resultats = $statement->fetchAll(PDO::FETCH_ASSOC);

Answer 2

The json you're expecting doesn't look right. It should be:
[
{"cityName": "Anshan"},
{"cityName": "Angoul�me"},
{"cityName": "Anderson"},
{"cityName": "An�polis"},
{"cityName": "Ananindeua"}
]
and to generate this you need code like this:
foreach($resultats as $city) {
$item = new stdClass();
$item.cityName = current($city);
$output[] = item;
}

Answer 3

Your array's key is same (cityName), so the value getting replaced on each assignment.
use a numeric array, or another method that differentiating the key
e.g.,
foreach($resultats as $city) {
$output['cityName'][] = current($city);
}
output will be
{"cityName":
[
"Anshan",
"Angoulme",
"Anpolis"
]
}

Answer 4

The problem was that the table which I populate from database contains some accented characters, so the json_encode() failing.
The solution was to add charset=UTF8 in the first parameter of the PDO instance.
$connexion = new PDO("mysql:host=localhost;dbname=world;charset=UTF8", 'root', 'toor');