(PHP 4, PHP 5, PHP 7)
Strip whitespace (or other characters) from the beginning and end of a string
string trim ( string $str [, string $character_mask = " \t\n\r\0\x0B" ] )
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 1