How can PHP variables be used effectively to extract variable words from fixed text patterns?

To extract variable words from fixed text patterns in PHP, you can use variables and string functions such as `preg_match` to extract the dynamic parts of the text. By defining placeholders in the fixed text pattern and using variables to store the extracted values, you can effectively extract the variable words.

$fixedText = "Hello, my name is John.";
$pattern = "/Hello, my name is (\w+)/";
preg_match($pattern, $fixedText, $matches);
$variableWord = $matches[1];

echo $variableWord; // Output: John