keyword_in()

    
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Performs a keyword_extract() on the string parameter, and determines if the value in the keywords parameter is contained in the keyword list, and returns a boolean 1 or 0 to signify that the keyword is or is not in the string. If the keywords parameter is an array of strings, checks each value in the array, and returns an array of booleans specifying whether the array element is or is not in the string.
Syntax 
keyword_in( keywords_array var, search_string )
If keywords is an array, returns an array of booleans specifying if a given keyword element is in the keyword list. -- If keywords is a string, returns a boolean specifying if the given keyword is in the keyword list.
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