//Qestions related to php language, just need answers to fill blanks

The concatenation operator in PHP is a ____________________

In PHP, the escape character is the ____________________

Using a ____________________ escape sequence at the end of an echo statement makes XHTML code easier to debug and read.

The argument you pass to the strlen() function is a literal string or string variable whose ____________________ you want to count.

The ucfirst() function and the lcfirst() function only change the ____________________ character of a string.

Thanks