PHP Functions Essential Reference

trim

string trim(string string) 

Removes whitespace from the left and right ends of a string.

Returns:

String

Description:

trim() removes all whitespace characters from both the left and right ends of a string. The function considers the following characters to be whitespace:

Character Name	ASCII Value	PHP Character Escape Sequence
null	0	\0
tab	9	\t
newline	10	\n
vertical tab	11	none
carriage return	13	\r
space	32	none

Version:

PHP 3+, PHP 4+

See also:

To strip whitespace from the start or end of a string:

chop() 
ltrim() 
rtrim() 

Example:

Ensure that a value submitted contains characters other than whitespace

<?php if (count ($HTTP_POST_VARS)) { $name = trim ($HTTP_POST_VARS['name']); if ($name) { echo ("<b>$name</b>: There are some who ...