ftruncate Truncates a file to a given length boolftruncate resourcehandle intsize Takes the filepointer, handle, and truncates the file to length, size. &return.success; The file pointer is changed only in append mode. In write mode, additional fseek call is needed. Prior to PHP 4.3.3, ftruncate returns an integer value of 1 on success, instead of boolean &true;. See also fopen and fseek.