Clean function in php

/*** clean FUNCTION IN PHP
PHP provides functions that help to clean up strings by removing
unwanted whitespace or other characters from the beginning and/or
end of the string: trim , rtrim , and ltrim.
***/

Example
clean($request->description)
  
/*** strip_tags FUNCTION IN PHP
PHP also provides another type of cleanup function: strip_tags
which removes HTML and PHP tags from strings.
***/

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