How To Remove White Spaces from the Beginning and/or the End of a String in PHP

There are 4 PHP functions you can use remove white space characters from the beginning and/or the end of a string:
* trim() - Remove white space characters from the beginning and the end of a string.
* ltrim() - Remove white space characters from the beginning of a string.
* rtrim() - Remove white space characters from the end of a string.
* chop() - Same as rtrim()

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White space characters are defined as:
* " " (ASCII 32 (0x20)), an ordinary space.
* " " (ASCII 9 (0x09)), a tab.
* "
" (ASCII 10 (0x0A)), a new line (line feed).
* "
" (ASCII 13 (0x0D)), a carriage return.

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