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NAME 
        replace - generic replace function 
 
SYNTAX 
        string replace(string s, string from, string to); 
        or 
        string replace(string s, string *from, string *to); 
        or 
        array replace(array a, mixed from, mixed to); 
        or 
        mapping replace(mapping a, mixed from, mixed to); 
 
DESCRIPTION 
        This function can do several kinds replacement operations, the 
        different syntaxes do different things as follow: 
 
        1) string replace(string s, string from, string to); 
           When given strings as second and third argument, a copy of 
           s with every occurance of 'from' return 'to'. 
 
        2) string replace(string s, string *from, string *to); 
           When given arrays of strings as second and third argument, 
           every occurance of from[0] in s is replaced by to[0], 
           from[1] is replaced by to[1] and so on... 
 
        3) array replace(array a, mixed from, mixed to); 
        4) mapping replace(mapping a, mixed from, mixed to); 
           When the first argument is an array or mapping, the values in 
           a are searched for values equal to from, which are replaced by 
           to destructively.