Handling form submissions and processing user input in PHP Mocktest

To access form data submitted via the POST method in PHP, you use the $_POST superglobal array followed by the name of the form field as the key.

The is_uploaded_file() function in PHP checks whether a file was uploaded via HTTP POST.

The move_uploaded_file() function in PHP is used to handle file uploads. It moves an uploaded file to a new location.

The filter_var() function in PHP can be used to validate email addresses using the FILTER_VALIDATE_EMAIL filter.

To check if a checkbox is checked in PHP when submitted via a form, you can use the isset() function with the checkbox name as the parameter.

The trim() function in PHP is used to remove whitespace from the beginning and end of a string.

The header() function in PHP is used to send raw HTTP headers. It is commonly used to redirect the user to another page by sending a Location header.

SQL injection attacks can be prevented in PHP by using prepared statements with parameterized queries. This approach separates SQL logic from data, preventing malicious SQL code from being injected into the SQL query.

The is_array() function in PHP is used to check if a variable is an array. It returns true if the variable is an array and false otherwise.

The explode() function in PHP is used to split a string into an array based on a specified delimiter.