substring_var()

   Also See:   substring  
Also See:   asciichar asciivalue gettoken glosub glosub_array indexof indexofi keyword_extract keyword_extract_merge keyword_extract_merge_init keyword_extract_merge_results keyword_in len len_var ltrim padl padr rtrim substring tokenize tolower toupper trim

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Returns the substring of string, beginning at position start, length characters long. This function is identical to substring() but its first parameter is passed by reference, improving performance when dealing with large strings.
Syntax 
substring_var( string var, position, length )
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