php - a:0:{} is replaced into database as s:6:"a:0:{}";

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When I try to add user meta to empty array as: a:0:{} it's replaced into database as s:6:"a:0:{}";

I just need to save it as I written as a:0:{}

this is my code:

$sassada = get_user_meta($current_user, 'custom_system');   
if(empty($sassada)){
    add_user_meta($sassada, 'custom_system', 'a:0:{}');
}

When I try to add user meta to empty array as: a:0:{} it's replaced into database as s:6:"a:0:{}";

I just need to save it as I written as a:0:{}

this is my code:

$sassada = get_user_meta($current_user, 'custom_system');   
if(empty($sassada)){
    add_user_meta($sassada, 'custom_system', 'a:0:{}');
}

• php
• user-meta

Share Improve this question edited Jun 2, 2017 at 4:12 CodeMascot 4,53722 gold badges1515 silver badges2525 bronze badges asked Jun 2, 2017 at 3:37 YoguYogu 8555 silver badges1414 bronze badges 1

• 1 Why you are putting $sassada as the first parameter of add_user_meta function ? It is wrong cause it should be user ID and secondly you are checking $sassada is empty. That means only empty $sassada goes there. – CodeMascot Commented Jun 2, 2017 at 4:21

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1 Answer 1

Sorted by: Reset to default 3

API calls are API calls, not database writes. What and how information is stored in the DB is usually best left as an unknown since, unless explicitly defined in the API, it might change.

Specifically in this case, wordpress will serialize the value being passed, and since you are passing a string it is serialized as a string.

And if what you are after is storing an empty array, just pass an empty array as the value.

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