(PHP 5, PECL OCI8 >= 1.1.0)
OCI-Lob->erase — Erases a specified portion of the internal LOB data
Erases a specified portion of the internal LOB data starting at a specified offset. If called without parameters, it erases all LOB data.
For BLOBs, erasing means that the existing LOB value is overwritten with zero-bytes. For CLOBs, the existing LOB value is overwritten with spaces.
Returns the actual number of characters/bytes erased or FALSE on failure.