What considerations should be made when setting the minimum and maximum character limits for user input validation in PHP?

When setting minimum and maximum character limits for user input validation in PHP, it is important to consider the expected input length, the usability of the form, and the potential impact on database storage. It is also crucial to provide clear error messages to users if their input does not meet the specified limits. 

$input = $_POST['input'];

$min_length = 5;
$max_length = 50;

if(strlen($input) < $min_length || strlen($input) > $max_length) {
    echo "Input must be between $min_length and $max_length characters.";
    // handle error, redirect back to form, etc.
} else {
    // input is valid, continue processing
}

Keywords

PHP user input validation character limits strlen() error handling

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