What potential issues can arise when using str_replace() for pattern detection in PHP?

Using str_replace() for pattern detection in PHP can lead to unintended replacements if the search pattern appears within the replacement string. To avoid this issue, it is recommended to use the more robust preg_replace() function with regular expressions for pattern detection in PHP.

// Using preg_replace() with regular expressions for pattern detection
$string = "Hello, World!";
$pattern = "/Hello/";
$replacement = "Hi";
$new_string = preg_replace($pattern, $replacement, $string);

echo $new_string; // Output: Hi, World!