dbqueries = 0;
$PERF->logwrites = 0;
if (function_exists('microtime')) {
$PERF->starttime = microtime();
}
if (function_exists('memory_get_usage')) {
$PERF->startmemory = memory_get_usage();
}
if (function_exists('posix_times')) {
$PERF->startposixtimes = posix_times();
}
if (function_exists('apd_set_pprof_trace')) {
// APD profiling
if ($USER->id > 0 && $CFG->perfdebug >= 15) {
$tempdir = $CFG->dataroot . '/temp/profile/' . $USER->id;
mkdir($tempdir);
apd_set_pprof_trace($tempdir);
$PERF->profiling = true;
}
}
}
/**
* Function to raise the memory limit to a new value.
* Will respect the memory limit if it is higher, thus allowing
* settings in php.ini, apache conf or command line switches
* to override it
*
* The memory limit should be expressed with a string (eg:'64M')
*
* @param string $newlimit the new memory limit
* @return bool
*/
function raise_memory_limit ($newlimit) {
if (empty($newlimit)) {
return false;
}
$cur = @ini_get('memory_limit');
if (empty($cur)) {
// if php is compiled without --enable-memory-limits
// apparently memory_limit is set to ''
$cur=0;
} else {
if ($cur == -1){
return true; // unlimited mem!
}
$cur = get_real_size($cur);
}
$new = get_real_size($newlimit);
if ($new > $cur) {
ini_set('memory_limit', $newlimit);
return true;
}
return false;
}
/**
* Function to reduce the memory limit to a new value.
* Will respect the memory limit if it is lower, thus allowing
* settings in php.ini, apache conf or command line switches
* to override it
*
* The memory limit should be expressed with a string (eg:'64M')
*
* @param string $newlimit the new memory limit
* @return bool
*/
function reduce_memory_limit ($newlimit) {
if (empty($newlimit)) {
return false;
}
$cur = @ini_get('memory_limit');
if (empty($cur)) {
// if php is compiled without --enable-memory-limits
// apparently memory_limit is set to ''
$cur=0;
} else {
if ($cur == -1){
return true; // unlimited mem!
}
$cur = get_real_size($cur);
}
$new = get_real_size($newlimit);
// -1 is smaller, but it means unlimited
if ($new < $cur && $new != -1) {
ini_set('memory_limit', $newlimit);
return true;
}
return false;
}
/**
* Converts numbers like 10M into bytes.
*
* @param mixed $size The size to be converted
* @return mixed
*/
function get_real_size($size=0) {
if (!$size) {
return 0;
}
$scan['MB'] = 1048576;
$scan['Mb'] = 1048576;
$scan['M'] = 1048576;
$scan['m'] = 1048576;
$scan['KB'] = 1024;
$scan['Kb'] = 1024;
$scan['K'] = 1024;
$scan['k'] = 1024;
while (list($key) = each($scan)) {
if ((strlen($size)>strlen($key))&&(substr($size, strlen($size) - strlen($key))==$key)) {
$size = substr($size, 0, strlen($size) - strlen($key)) * $scan[$key];
break;
}
}
return $size;
}
/**
* Create a directory.
*
* @uses $CFG
* @param string $directory a string of directory names under $CFG->dataroot eg stuff/assignment/1
* param bool $shownotices If true then notification messages will be printed out on error.
* @return string|false Returns full path to directory if successful, false if not
*/
function make_upload_directory($directory, $shownotices=true) {
global $CFG;
$currdir = $CFG->dataroot;
umask(0000);
if (!file_exists($currdir)) {
if (! mkdir($currdir, $CFG->directorypermissions)) {
if ($shownotices) {
echo '
ERROR: You need to create the directory '.
$currdir .' with web server write access
'."
\n";
}
return false;
}
}
// Make sure a .htaccess file is here, JUST IN CASE the files area is in the open
if (!file_exists($currdir.'/.htaccess')) {
if ($handle = fopen($currdir.'/.htaccess', 'w')) { // For safety
@fwrite($handle, "deny from all\r\nAllowOverride None\r\nNote: this file is broken intentionally, we do not want anybody to undo it in subdirectory!\r\n");
@fclose($handle);
}
}
$dirarray = explode('/', $directory);
foreach ($dirarray as $dir) {
$currdir = $currdir .'/'. $dir;
if (! file_exists($currdir)) {
if (! mkdir($currdir, $CFG->directorypermissions)) {
if ($shownotices) {
echo 'ERROR: Could not find or create a directory ('.
$currdir .')
'."
\n";
}
return false;
}
//@chmod($currdir, $CFG->directorypermissions); // Just in case mkdir didn't do it
}
}
return $currdir;
}
/**
* This function will introspect inside DB to detect it it's a UTF-8 DB or no
* Used from setup.php to set correctly "set names" when the installation
* process is performed without the initial and beautiful installer
*/
function setup_is_unicodedb() {
global $CFG, $db, $INSTALL;
$unicodedb = false;
// Calculate $CFG->dbfamily
$dbfamily = set_dbfamily();
switch ($dbfamily) {
case 'mysql':
$rs = $db->Execute("SHOW LOCAL VARIABLES LIKE 'character_set_database'");
if ($rs && !$rs->EOF) { // rs_EOF() not available yet
$records = $rs->GetAssoc(true);
$encoding = $records['character_set_database']['Value'];
if (strtoupper($encoding) == 'UTF8') {
$unicodedb = true;
}
}
break;
case 'postgres':
/// Get PostgreSQL server_encoding value
$rs = $db->Execute("SHOW server_encoding");
if ($rs && !$rs->EOF) { // rs_EOF() not available yet
$encoding = $rs->fields['server_encoding'];
if (strtoupper($encoding) == 'UNICODE' || strtoupper($encoding) == 'UTF8') {
$unicodedb = true;
}
}
break;
case 'mssql':
/// MSSQL only runs under UTF8 + the proper ODBTP driver (both for Unix and Win32)
$unicodedb = true;
break;
case 'oracle':
/// Get Oracle DB character set value
$rs = $db->Execute("SELECT parameter, value FROM nls_database_parameters where parameter = 'NLS_CHARACTERSET'");
if ($rs && !$rs->EOF) { // rs_EOF() not available yet
$encoding = $rs->fields['value'];
if (strtoupper($encoding) == 'AL32UTF8') {
$unicodedb = true;
}
}
break;
}
return $unicodedb;
}
/**
* This internal function sets and returns the proper value for $CFG->dbfamily based on $CFG->dbtype
* It's called by preconfigure_dbconnection() and at install time. Shouldn't be used
* in other places. Code should rely on dbfamily to perform conditional execution
* instead of using dbtype directly. This allows quicker adoption of different
* drivers going against the same DB backend.
*
* This function must contain the init code needed for each dbtype supported.
*
* return string dbfamily value (mysql, postgres, oracle, mssql)
*/
function set_dbfamily() {
global $CFG, $INSTALL;
// Since this function is also used during installation process, i.e. during install.php before $CFG->dbtype is set.
// we need to get dbtype from the right variable
if (!empty($INSTALL['dbtype'])) {
$dbtype = $INSTALL['dbtype'];
} else {
$dbtype = $CFG->dbtype;
}
switch ($dbtype) {
case 'mysql':
case 'mysqli':
$CFG->dbfamily='mysql';
break;
case 'postgres7':
$CFG->dbfamily='postgres';
break;
case 'mssql':
case 'mssql_n':
case 'odbc_mssql':
$CFG->dbfamily='mssql';
break;
case 'oci8po':
$CFG->dbfamily='oracle';
break;
}
return $CFG->dbfamily;
}
/**
* This internal function, called from setup.php BEFORE stabilishing the DB
* connection, defines the $CFG->dbfamily global -by calling set_dbfamily()-
* and predefines some constants needed by ADOdb to switch some default
* behaviours.
*
* This function must contain all the pre-connection code needed for each
* dbtype supported.
*/
function preconfigure_dbconnection() {
global $CFG;
/// Define dbfamily
set_dbfamily();
/// Based on $CFG->dbfamily, set some ADOdb settings
switch ($CFG->dbfamily) {
/// list here family types where we know
/// the fieldnames will come in lowercase
/// so we can avoid expensive tolower()
case 'postgres':
case 'mysql':
case 'mssql':
define ('ADODB_ASSOC_CASE', 2);
break;
case 'oracle':
define ('ADODB_ASSOC_CASE', 0); /// Use lowercase fieldnames for ADODB_FETCH_ASSOC
/// (only meaningful for oci8po, it's the default
/// for other DB drivers so this won't affect them)
/// Row prefetching uses a bit of memory but saves a ton
/// of network latency. With current AdoDB and PHP, only
/// Oracle uses this setting.
define ('ADODB_PREFETCH_ROWS', 1000);
break;
default:
/// if we have to lowercase it, set to 0
/// - note that the lowercasing is very expensive
define ('ADODB_ASSOC_CASE', 0); //Use lowercase fieldnames for ADODB_FETCH_ASSOC
}
}
function init_memcached() {
global $CFG, $MCACHE;
include_once($CFG->libdir . '/memcached.class.php');
$MCACHE = new memcached;
if ($MCACHE->status()) {
return true;
}
unset($MCACHE);
return false;
}
function init_eaccelerator() {
global $CFG, $MCACHE;
include_once($CFG->libdir . '/eaccelerator.class.php');
$MCACHE = new eaccelerator;
if ($MCACHE->status()) {
return true;
}
unset($MCACHE);
return false;
}
?>