PHP Manual: Erases a specified portion of the internal LOB data

public intfalse OCILob::erase(intnull $offset = null, intnull $length = null)

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.

Version	Description
8.0.0, PECL OCI8 3.0.0	`offset` and `length` are now nullable.
8.0.0, PECL OCI8 3.0.0	The OCI-Lob class was renamed to OCILob to align with PHP naming standards.

OCILob::erase