Repairs the given file and returns it as a string.
Parameters
filename
The file to be repaired.
config
The config config can be passed either as an
array or as a string. If a string is passed, it is interpreted as the
name of the configuration file, otherwise, it is interpreted as the
options themselves.
Check http://tidy.sourceforge.net/docs/quickref.html for an
explanation about each option.
encoding
The encoding parameter sets the encoding for
input/output documents. The possible values for encoding are:
ascii, latin0, latin1,
raw, utf8, iso2022,
mac, win1252, ibm858,
utf16, utf16le, utf16be,
big5, and shiftjis.