Trim Whitespace in PHP

Trim is a nice built-in function for PHP.  My default it will trim off the whitespace from the beginning and end of a string.

Description

string trim ( string $str [, string $charlist ] )

This function returns a string with whitespace stripped from the beginning and end of str . Without the second parameter, trim() will strip these characters:

• " " (ASCII 32 (0x20)), an ordinary space.
• "\t" (ASCII 9 (0x09)), a tab.
• "\n" (ASCII 10 (0x0A)), a new line (line feed).
• "\r" (ASCII 13 (0x0D)), a carriage return.
• "\0" (ASCII 0 (0x00)), the NUL-byte.
• "\x0B" (ASCII 11 (0x0B)), a vertical tab.      

http://www.php.net/trim