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What are common mistakes to avoid when retrieving values from input fields in PHP forms?

One common mistake to avoid when retrieving values from input fields in PHP forms is not properly sanitizing user input, which can leave your application vulnerable to SQL injection attacks. To solve this issue, always sanitize user input before using it in database queries or other operations.

php 
// Retrieve value from input field and sanitize it
$input_value = isset($_POST['input_field']) ? htmlspecialchars($_POST['input_field']) : '';

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