php man page for sqlite_popen

SQLITE_POPEN(3) 														   SQLITE_POPEN(3)

sqlite_popen - Opens a persistent handle to an SQLite database and create the database if it does not exist

SYNOPSIS
       resource sqlite_popen (string  $filename, [int  $mode = 0666], [string  &$error_message])

DESCRIPTION
	This  function	behaves  identically to sqlite_open(3) except that is uses the persistent resource mechanism of PHP. For information about
       the meaning of the parameters, read the sqlite_open(3) manual page.

       sqlite_popen(3) will first check to see if a persistent handle has already been opened for the given $filename. If it finds one, it returns
       that handle to your script, otherwise it opens a fresh handle to the database.

	The  benefit  of  this	approach is that you don't incur the performance cost of re-reading the database and index schema on each page hit
       served by persistent web server SAPI's (any SAPI except for regular CGI or CLI).

       Note

	       If you use persistent handles and have the database updated by a background process (perhaps via a crontab), and that  process  re-
	      creates  the  database  by  overwriting it (either by unlinking and rebuilding, or moving the updated version to replace the current
	      version), you may experience undefined behaviour when a persistent handle on the old version of the database is recycled.

	       To avoid this situation, have your background processes open the same database file and perform their updates in a transaction.

PARAMETERS
	      o $filename
		- The filename of the SQLite database. If the file does not exist, SQLite will attempt to create it. PHP must have  write  permis-
		sions to the file if data is inserted, the database schema is modified or to create the database if it does not exist.

	      o $mode
		-  The	mode  of the file. Intended to be used to open the database in read-only mode. Presently, this parameter is ignored by the
		sqlite library. The default value for mode is the octal value 0666 and this is the recommended value.

	      o $error_message
		- Passed by reference and is set to hold a descriptive error message explaining why the database could not be opened if there  was
		an error.

RETURN VALUES
	Returns a resource (database handle) on success, FALSE on error.

SEE ALSO
       sqlite_open(3), sqlite_close(3), sqlite_factory(3).

PHP Documentation Group 													   SQLITE_POPEN(3)