PHP isset and empty funtion.
![php - if (isset($_POST["submit"])) - Stack Overflow](https://i.stack.imgur.com/RmKne.jpg "php - if (isset($_POST[\"submit\"])) - Stack Overflow")
php - if (isset($_POST["submit"])) - Stack Overflow
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html - Php isset not running - Stack Overflow
![javascript - if(isset($_POST['btn-save'])) doesn't return true - Stack Overflow](https://i.stack.imgur.com/dZ7Vn.png "javascript - if(isset($_POST['btn-save'])) doesn't return true - Stack Overflow")
javascript - if(isset($_POST['btn-save'])) doesn't return true - Stack Overflow
PHP : Validating forms and loops. Some things for helping you to validate input The isset function can be used to test if a php variable is passed. - ppt download
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PHP - isset() Function to Verify if a Variable Has a Value
![javascript - if(isset($_POST['btn-save'])) doesn't return true - Stack Overflow](https://i.stack.imgur.com/GPEP0.png "javascript - if(isset($_POST['btn-save'])) doesn't return true - Stack Overflow")