This bug is similar to already resolved bugs 14558 and 15419, but problem is still persists when there is available some code to work with BLOBs. 

 Here is example:

CREATE TABLE TEST_TABLE (
    ID INTEGER NOT NULL,
    STR_CONTENT VARCHAR(100),
    BLOB_CONTENT BLOB SUB_TYPE 1 SEGMENT SIZE 80
);

$db = ibase_connect($database,$user,$password);

$result = ibase_query($db,'select * from test_table');
while($row = ibase_fetch_row($result))
{
    $info = ibase_blob_info($row[2]);
    $data = '';
    $blob = ibase_blob_open($bid);
    for($i=0;$i<$info[1];$i++)
        $data .= ibase_blob_get($blob,$info[2]);
    ibase_blob_close($blob);
    echo $data;
};
ibase_free_result($result);

ibase_close();

 This code works fine, but if i remove ibase_blob_close() function call (and therefore leave BLOB open) - PHP will crash on calling ibase_close().