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Warning: Undefined array key "salary_year" in C:\xampp\htdocs\SHIVSALARY2\save_salary.php on line 5

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Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in C:\xampp\htdocs\SHIVSALARY2\save_salary.php:11 Stack trace: #0 {main} thrown in C:\xampp\htdocs\SHIVSALARY2\save_salary.php on line 11