As of 2.0.3: "Warning: array_key_exists(): The first argument should be either a string or an integer" when encountering page titled via TranslatableMarkup [#3293237] | Drupal.org
Error: array_key_exists(): The first argument should be either a string or an integer · Issue #1015 · nWidart/laravel-modules · GitHub
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Warning: array_key_exists() expects parameter 2 to be array, null given · Issue #73 · php-http/cache-plugin · GitHub
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array_key_exists() expects parameter 2 to be array, null given | FireFly-III 5.5.6 · Issue #4625 · firefly-iii/firefly-iii · GitHub
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PHP array_key_exists() Function
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PHP array_key_exists() Function
PHP array_key_exists() Function
PHP array_key_exists() - Check if Key Exists in Array
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PHP array_key_exists() Function
array_key_exists() expects parameter 2 to be array, null given · Issue #81 · Edujugon/PushNotification · GitHub