(PHP 5, PHP 7, PECL OCI8 >= 1.1.0)
OCI-Lob::erase — Erases a specified portion of the internal LOB data
$offset
[, int $length
]] )
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.
offset
length
Returns the actual number of characters/bytes erased 或者在失败时返回 FALSE.