You can check with this code:
$sqlite = extension_loaded('sqlite');
if ($sqlite)
{
echo 'SQLITE IS INSTALLED';
}
You can also check which version is installed:
$sqlite2 = extension_loaded('sqlite2');
$sqlite3 = extension_loaded('sqlite3');
if ($sqlite2 || $sqlite3)
{
if ($sqlite2)
{
echo 'SQLITE2 IS INSTALLED';
}
if ($sqlite3)
{
echo 'SQLITE3 IS INSTALLED';
}
} else
{
echo 'SQL IS NOT INSTALLED';
}