What are the common syntax errors to watch out for when concatenating strings in PHP functions?

Common syntax errors to watch out for when concatenating strings in PHP functions include forgetting to use the concatenation operator (.) between strings, missing quotation marks around strings, and not properly escaping special characters within the strings. To avoid these errors, make sure to properly concatenate strings using the (.) operator, enclose strings in quotation marks, and escape special characters when necessary.

// Example of concatenating strings in PHP function without syntax errors

$string1 = "Hello";
$string2 = "World";

$concatenatedString = $string1 . " " . $string2;

echo $concatenatedString;