to get the file

String functions
Function Parameter Returns
strlen A string The no. of characters in the string
strcmp Two strings 0, negative, or positive number
strpos Two strings The character position...
substr
A string and
an integer
The substring of the string, starting from
the second parameter (possibly, third
parameter for length)
chop A string Remove all whitespace from its end
trim A string Remove all whitespace from both ends
ltrim A string Remove all whitespace from its begin
strtolower A string All uppercase letters converted to
lowercase
strtoupper A string All lowercase letters converted to
uppercase
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