Description:
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lasterrormsg() shows only "constraint failed" but could also show constraint name like in sqlite command-line client:
sqlite> insert into test values(null,null,null);
Error: constraint val1 or val2 must be specified failed
sqlite>
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From manual page: http://www.php.net/sqlite3.lasterrormsg#refsect1-sqlite3.lasterrormsg-returnvalues
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Test script:
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$db = new SQLite3('test.db', SQLITE3_OPEN_READWRITE);
$db->exec('CREATE TABLE test (id INTEGER NOT NULL PRIMARY KEY, val1 INTEGER val2 INTEGER, CONSTRAINT "val1 or val2 must be specified" CHECK (val1 NOT NULL OR val2 NOT NULL))');
$db->exec('INSERT INTO test VALUES (NULL,NULL,NULL)');
echo $db->lasterrormsg();