Count items in a json string

[craigward]

Hi,

 

I am fairly new to PHP and have been messing around trying different things out.

 

One thing I am stuck with is being able to count the elements of a json string so I can create a loop. I can't find anything on the official PHP site and have been looking on Google for ages.

 

Would love it if someone could help me out.

 

Cheers

 

Craig

[salathe]

You can convert the JSON string into a PHP array (or object, if you want) then count and/or loop over that. Take a look at the json_decode function. 

[taquitosensei]

you'll have to decode it.

If you have php 5.1 ( I think it might be 5.2 ) you can use the built in function

 

 
$array=json_decode($arraywithyourjsonconents); 
foreach($array as $k=>$v)
{

}
//or 
for($a=0;$a<count($array);$a++)
{

}

if it's before that version of php then you'll have to find a php class.  I'm pretty sure there's a pear class available.

 

[craigward]

Thanks for the replies.

 

Here is the code I am using.

 

$flickrfeed = json_decode($filecontents);

$i = 0;
$total = count($flickerfeed);

while ($i <= $total) 
{ 
$farm = $flickrfeed->photos->photo[$i]->farm;
$id = $flickrfeed->photos->photo[$i]->id;
$server = $flickrfeed->photos->photo[$i]->server;
$secret = $flickrfeed->photos->photo[$i]->secret;

echo "<img src=\"http://farm$farm.static.flickr.com/$server/$id"._."$secret.jpg\" alt=\"Flickr Image\" />";

$i++;
}

?>

 

I have tried to use the foreach loop but havent had luck yet. but I am probably doing something wrong.

[craigward]

I can't get the for loop to work.

$flickrfeed = json_decode($filecontents);

for($a=0;$a<count($flickrfeed);$a++)
{ 
$farm = $flickrfeed->photos->photo[$a]->farm;
$id = $flickrfeed->photos->photo[$a]->id;
$server = $flickrfeed->photos->photo[$a]->server;
$secret = $flickrfeed->photos->photo[$a]->secret;
echo "<img src=\"http://farm$farm.static.flickr.com/$server/$id"._."$secret.jpg\" alt=\"Flickr Image\" />";
}

?>

 

But it does work if I use

for($a=0;$a<10;$a++)

 

[salathe]

You'll probably want to count($flickrfeed->photos->photo) 

[craigward]

Cheers salathe

 

Your a star, everything working. Been looking for that answer for ages.