How can one address the issue of replacing specific words without affecting similar words in PHP?

When replacing specific words in PHP, you can use regular expressions with word boundaries to ensure that only the exact word is replaced and not similar words. By using \b before and after the word in the regular expression pattern, you can match only whole words and avoid replacing partial matches.

$text = "The quick brown fox jumps over the lazy dog.";
$word_to_replace = "over";
$replacement_word = "above";

$pattern = "/\b" . $word_to_replace . "\b/";
$replaced_text = preg_replace($pattern, $replacement_word, $text);

echo $replaced_text;