OP_Explain       1784 ext/pdo_sqlite/sqlite/src/vdbe.c case OP_Explain:
OP_Explain        708 ext/pdo_sqlite/sqlite/src/vdbeaux.c   }while( i<p->nOp && p->explain==2 && p->aOp[i].opcode!=OP_Explain );
OP_Explain       2153 ext/pdo_sqlite/sqlite/src/where.c       sqlite3VdbeOp3(v, OP_Explain, i, pLevel->iFrom, zMsg, P3_DYNAMIC);