Changes

Important note:

Important note:

* single quoted strings don't recognize most special character codes like \n <ref name="sitepoint">[http://www.sitepoint.com/article/advanced-email-php/3/ Advanced PHP from Sitepoint]</ref> and don't expand variables, however they do recognize \' and \\

* single quoted strings don't recognize most special character codes like \n <ref name="sitepoint">[http://www.sitepoint.com/article/advanced-email-php/3/ Advanced PHP from Sitepoint]</ref> and don't expand variables, however they do recognize \' and \\ <ref name="phpstrings">PHP: [http://www.php.net/manual/en/language.types.string.php#language.types.string.syntax.single Strings]</ref>

===Concatenation ===

===Concatenation ===