json_decode deals with arrays and objects - php

Question

Here's the function I created to grab Delicious recent bookmarks via cURL auth and then XML->JSON conversion:
<?php
// JSON URL which should be requested
$json_url = 'https://api.del.icio.us/v1/posts/recent';
$username = 'myusername'; // authentication
$password = 'mypassword'; // authentication
// Initializing curl
$ch = curl_init( $json_url );
// Configuring curl options
$options = array(
CURLOPT_RETURNTRANSFER => true,
CURLOPT_USERPWD => $username . ":" . $password // authentication
);
// Setting curl options
curl_setopt_array( $ch, $options );
$cache_delicious = '/BLAHBLAH/'.sha1($json_url).'.json';
if(file_exists($cache_delicious) && filemtime($cache_delicious) > time() - 1000){
// if a cache file newer than 1000 seconds exist, use it
$data_delicious = file_get_contents($cache_delicious);
} else {
$delicious_result = simplexml_load_string(curl_exec($ch));
$data_delicious = json_encode($delicious_result);
file_put_contents($cache_delicious, $data_delicious);
}
$obj = $data_delicious['post']['#attributes'];
foreach (array_slice(json_decode($data_delicious, true), 0, 5) as $obj) {
$delicious_title = str_replace('"', '\'', $obj['description']);
$delicious_url = htmlentities($obj['href'], ENT_QUOTES, "UTF-8");
$output = "<li><a rel=\"external nofollow\" title=\"$delicious_title\" href=\"$delicious_url\">$delicious_title</a></li>";
echo $output;
}
?>
Here's the JSON if I do a print_r($data_delicious);, reduced only to one entry for readability:
{
"#attributes":{
"tag":"",
"user":"myusername"
},
"post":[
{
"#attributes":{
"description":"Fastweb: fibra o VDSL? Disinformazione alla porta",
"extended":"",
"hash":"d00d03acd6e01e9c2e899184eab35273",
"href":"http:\/\/storify.com\/giovannibajo\/fastweb-fibra-o-vdsl",
"private":"no",
"shared":"yes",
"tag":"",
"time":"2013-06-14T10:30:08Z"
}
}
]
}
Unfortunately there's something wrong with the variables ($delicious_title and $delicious_url) in foreach, as I get Undefined index: description and href.

Answer 1

try to catch the error by using json-last-error

Answer 2

If you read the manual for json_decode you can see the second parameter. If you set it to true the output will be an array. So simply use array_slice(json_decode($data_delicious, true), 0, 5).
Better would be to get some error checking before hand.
<?php
$result = json_decode($data_delicious, true);
if (is_array($result)) {
foreach (array_slice($result, 0, 5) as $obj) {
$delicious_title = str_replace('"', '\'', $obj->description);
$delicious_url = htmlentities($obj->href, ENT_QUOTES, "UTF-8");
$output = "<li><a rel=\"external nofollow\" title=\"$delicious_title\" href=\"$delicious_url\">$delicious_title</a></li>";
echo $output;
}
}
?>

Answer 3

error clearly saying
your variable obj is undefined
try this
$obj_delicious = json_decode($data_delicious, true);
foreach (array_slice($obj_delicious, 0, 5) as $obj)
{ $delicious_title = str_replace('"', '\'', $obj['post']['#attributes']['description']);
$delicious_url = htmlentities($obj['post']['#attributes']['href'], ENT_QUOTES, "UTF-8");
$output = "<li><a rel=\"external nofollow\" title=\"$delicious_title\" href=\"$delicious_url\">$delicious_title</a></li>";
echo $output;
}
}