How can PHP developers implement control functions to validate input data when passing variables between pages?

PHP developers can implement control functions to validate input data by creating custom functions that check the input data for specific criteria such as data type, length, format, etc. These functions can be called before passing variables between pages to ensure that the data is valid and secure. By implementing control functions, developers can prevent potential security vulnerabilities and ensure that only safe and valid data is passed between pages. 

function validateInput($input) {
    // Perform validation checks on the input data
    // Return true if input is valid, false otherwise
}

// Example usage
$input = $_POST['input_data'];
if(validateInput($input)) {
    // Proceed with passing the variable to another page
} else {
    // Handle invalid input data
}

Keywords

PHP input validation control functions data validation variable passing.

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