Filter the empty array in the array array_filter() - Programmer All
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php - Laravel - Removing object inside of array based on key value - array_filter - Stack Overflow
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PHP Tutorial - PHP array_filter() function
How Array_filter in previous Array (Text) question and Array question result - LimeSurvey forums
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array_filter() expects parameter 1 to be array, null given in Drupal\webform_mailchimp\Plugin\WebformHandler\WebformMailChimpHandler->postSave() [#3096797] | Drupal.org