Tests if row is existing. Syntax:
$object->exists(string $table, mixed $array, bool $all)

Object

- Object of extension.

Table

- Table name.

Array

- String of SQL condition or array, where key is column name and value is its value. When all respectively one is true, returns TRUE.

All

- If it’s TRUE, this method will return true only when all conditions are true, else this method will return true when whichever condition is true.

Return value: This method returns TRUE or FALSE, if the row is right now existing.