(Commented with '//' means it is not implemented yet)

ogrenvelope.cc:  PHP_ME(OGREnvelope, IsInit, NULL, ZEND_ACC_PUBLIC)
ogrenvelope.cc:  PHP_ME(OGREnvelope, Merge, NULL, ZEND_ACC_PUBLIC)
ogrenvelope.cc:  PHP_ME(OGREnvelope, MergeCoords, NULL, ZEND_ACC_PUBLIC)
ogrenvelope.cc:  PHP_ME(OGREnvelope, Intersect, NULL, ZEND_ACC_PUBLIC)
ogrenvelope.cc:  PHP_ME(OGREnvelope, Intersects, NULL, ZEND_ACC_PUBLIC)
ogrenvelope.cc:  PHP_ME(OGREnvelope, Contains, NULL, ZEND_ACC_PUBLIC)
ogrenvelope.cc:  PHP_ME(OGREnvelope, GetMinX, NULL, ZEND_ACC_PUBLIC)
ogrenvelope.cc:  PHP_ME(OGREnvelope, GetMinY, NULL, ZEND_ACC_PUBLIC)
ogrenvelope.cc:  PHP_ME(OGREnvelope, GetMaxX, NULL, ZEND_ACC_PUBLIC)
ogrenvelope.cc:  PHP_ME(OGREnvelope, GetMaxY, NULL, ZEND_ACC_PUBLIC)