substring_var()

   Also See:   substring  
Also See:   asciichar asciivalue crypto_base64_decode crypto_base64_encode decodeattribute decodeentities encodeattribute encodeentities encodejavascriptstring gettoken glosub glosub_array indexof indexofi indexofl indexofli isalnum isalpha isascii iscntrl isdigit isgraph islower isprint ispunct isspace isupper isxdigit keyword_extract keyword_extract_merge keyword_extract_merge_init keyword_extract_merge_results keyword_in len len_var ltrim miva_cdata_encode miva_csv_encode miva_hex_decode miva_hex_encode miva_html_strip miva_joinstring miva_json_decode miva_json_decode_last_error miva_splitstring padl padr rtrim slugify 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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