Programming PHP

Attempts to lock the file path of the file specified by handle. The operation is one of the
following values:
If specified, would_block is set to true if the operation would cause a block on the file. The
function returns false if the lock could not be obtained, and true if the operation
succeeded.
Because file locking is implemented at the process level on most systems, flock( ) cannot
prevent two PHP scripts running in the same web server process from accessing a file at the
same time.
floor
double floor(double number)
Returns the largest integer value less than or equal to number.
flush
void flush( )
Sends the current output buffer to the client and empties the output buffer. See Chapter 13
for more information on using the output buffer.
fopen
LOCK_SH Shared lock (reader)
LOCK_EX Exclusive lock (writer)
LOCK_UN Release a lock (either shared or exclusive)
LOCK_NB Add to LOCK_SH or LOCK_EX to obtain a non-blocking lock
int fopen(string path, string mode[, bool include])
Opens the file specified by path and returns a file resource handle to the open file. If path
begins with http://, an HTTP connection is opened and a file pointer to the start of the
response is returned. If path begins with ftp://, an FTP connection is opened and a file
pointer to the start of the file is returned; the remote server must support passive FTP.
If path is php://stdin, php://stdout, or php://stderr, a file pointer to the appropriate
stream is returned.
The parameter mode specifies the permissions to open the file with. It must be one of the
following:
r Open the file for reading; file pointer will be at beginning of file.
r+ Open the file for reading and writing; file pointer will be at beginning of
file.
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