CODEWITHSUNDEEP
phparraysjson
Shawn Cooke
Shawn Cooke

Reputation: 967

PHP delete an array inside an array

I am trying to open a .json file and check if the file contains an array identified by its key. If so, I want to delete it and write the file back to the server. However, I am not having any luck and I think it is my misunderstanding of arrays of arrays in PHP:

PHP:

$song_id = "j8sUV-ykOB";
$file = "file.json";
$song_list = json_decode(file_get_contents($file),true);

foreach($song_list as $song){
  if(in_array($song_id,$song_list)){
    unset($song);   
    file_put_contents($file,json_encode($song_list,JSON_NUMERIC_CHECK | JSON_PRETTY_PRINT));          
  } 
}

file.json:

{
    "uKrb3eNCf": [
        "Thunder Rolls",
        "c"
    ],
    "kdOzCKjKN-": [
        "Turn the Page",
        "a"
    ],
    "bDreHgZgxF": [
        "Wild Nights",
        "a"
    ],
    "oeNcwqZJS": [
        "Every day is a winding road",
        "b,j"
    ],
    "j8sUV-ykOB": [
        "Testin",
        "b"
    ]
}

Upvotes: 0

Views: 2943

Answers (3)

Sunil Sharma
Sunil Sharma

Reputation: 174

<?php
$song_id = "j8sUV-ykOB";
$file = "file.json";
$song_list = json_decode(file_get_contents($file),true);
$new_array = array();

foreach($song_list as $key => $song){
    if($key != $song_id){
        $new_array[$key] = $song; 
    }  
}

file_put_contents($file,json_encode($new_array,JSON_NUMERIC_CHECK | JSON_PRETTY_PRINT));
?>

This code is successfully work foe me. In foreach check $song_id is equal to Key of array or not. if not insert this array in new array. So after complete all loop of foreach, new array created. So write json file again after decoded this new array. Thanks

Upvotes: 0

MinistryOfChaps
MinistryOfChaps

Reputation: 1484

In your case you can avoid a for loop because of the way your data is structured, we can directly call to the specific array of data in your $song_list array.

Your song ID are keys so you can go directly and check if the key exists in your song_list array, if it does exist then unset that key.

Here is it in action:

<?php
$song_id = "j8sUV-ykOB";
$file = "file.json";
$song_list = json_decode(file_get_contents($file),true);

if (array_key_exists($song_id, $song_list))
{
    unset($song_list[$song_id]);    
    file_put_contents($file,json_encode($song_list,JSON_NUMERIC_CHECK | JSON_PRETTY_PRINT));
}

Upvotes: 2

Dekel
Dekel

Reputation: 62676

What you want is to unset the $song_list[$key], not the $song variable:

foreach($song_list as $key => $song){
  if(in_array($song_id,$song_list)){
    unset($song_list[$key]);          
  } 
}
file_put_contents($file,json_encode($song_list,JSON_NUMERIC_CHECK | JSON_PRETTY_PRINT));

The $song variable in your code contains the value of the current element in your json file, doing unset on that value makes no sense.

Upvotes: 1

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