can not get an element from an array - php

Question

I'm trying to get a list of values for the Manufacturer field, but I do not get anything other than a white screen, no bugs, everything seems to be right, but nothing works
<?php
function removeBomUtf8($s){
if(substr($s,0,3)==chr(hexdec('EF')).chr(hexdec('BB')).chr(hexdec('BF'))){
return substr($s,3);
}else{
return $s;
}
}
$url = "http://www.pureexample.com/backend/data/car-sale.json";
$content = file_get_contents($url);
$clean_content = removeBomUtf8($content);
$decoded = json_decode($clean_content);
while ($el_name = current($decoded)) {
if ($el_name == 'Manufacturer') {
echo key($decoded).'<br />';
}
next($decoded);
}
?>

Answer 1

$decoded is an array of objects (type StdClass): when you call current you are returning that object which has three properties: Manufacturer, Sold and Month. If you just want to print out the Manufacturer name, edit your code as follows:
while ($el_name = current($decoded)) {
echo $el_name->Manufacturer . '<br>';
next($decoded);
}
However, as one of the commenters mentioned, the current/next syntax is pretty obscure, and not as easy to follow. You'd be better off writing:
foreach($decoded as $el_name) {
echo $el_name->Manufacturer . '<br>';
}

Answer 2

Each entry in the $decoded array should be a stdclass object representation of something like
{
"Manufacturer": "Toyota",
"Sold": 1200,
"Month": "2012-11"
}
Going from your comment...
i expect to see all rows with Manufacturer part like 1 "Manufacturer": "Toyota", 2 "Manufacturer": "Ford"3 "Manufacturer": "BMW" etc
what you're probably after is
$manufacturers = array_map(function($el) {
return sprintf('"Manufacturer": "%s"', $el->Manufacturer);
}, $decoded);
echo '<ol><li>', implode('</li><li>', $manufacturers), '</li></ol>';
Demo ~ https://eval.in/866131
Alternatively, just loop over $decoded with a foreach...
?>
<ol>
<?php foreach ($decoded as $el) : ?>
<li>"Manufacturer": "<?= htmlspecialchars($el->Manufacturer) ?>"</li>
<?php endforeach ?>
</ol>

Answer 3

You are dealing with an Object, and to make it more simple, try running this to get the results you said you wanted:
<?php
function removeBomUtf8($s){
if(substr($s,0,3)==chr(hexdec('EF')).chr(hexdec('BB')).chr(hexdec('BF'))){
return substr($s,3);
}else{
return $s;
}
}
$url = "http://www.pureexample.com/backend/data/car-sale.json";
$content = file_get_contents($url);
$clean_content = removeBomUtf8($content);
$decoded = json_decode($clean_content);
foreach ($decoded as $car) {
echo "Manufacturer is: $car->Manufacturer" . "<BR>";
echo "Sold is: $car->Sold" . "<BR>";
echo "Month is: $car->Month" . "<BR>";
echo "<P>";
}
?>
Here is the output from the PHP code above:
Manufacturer is: Toyota
Sold is: 1200
Month is: 2012-11
Manufacturer is: Ford
Sold is: 1100
Month is: 2012-11
Manufacturer is: BMW
Sold is: 900
Month is: 2012-11
Manufacturer is: Benz
Sold is: 600
Month is: 2012-11
Manufacturer is: GMC
Sold is: 500
Month is: 2012-11
Manufacturer is: HUMMER
Sold is: 120
Month is: 2012-11