fwrite Binary-safe file write intfwrite resourcehandle stringstring intlength fwrite writes the contents of string to the file stream pointed to by handle. If the length argument is given, writing will stop after length bytes have been written or the end of string is reached, whichever comes first. fwrite returns the number of bytes written, or &false; on error. Note that if the length argument is given, then the magic_quotes_runtime configuration option will be ignored and no slashes will be stripped from string. On systems which differentiate between binary and text files (i.e. Windows) the file must be opened with 'b' included in fopen mode parameter. If handle was fopened in append mode, fwrites are atomic (unless the size of string exceeds the filesystem's block size, on some platforms, and as long as the file is on a local filesystem). That is, there is no need to flock a resource before calling fwrite; all of the data will be written without interruption. ]]> See also fread, fopen, fsockopen, popen, and file_put_contents.