How can PHP developers ensure data normalization and proper structuring when dealing with string manipulation and search operations?

When dealing with string manipulation and search operations in PHP, developers can ensure data normalization and proper structuring by using functions like trim(), strtolower(), and preg_replace() to clean and format the data before performing any operations. This helps in standardizing the data and making search operations more accurate.

// Example code snippet for data normalization and structuring in PHP
$string = "  Hello World!  ";
$cleanedString = strtolower(trim(preg_replace('/\s+/', ' ', $string)));

echo $cleanedString;