I'm unserializing a large object using the following test script:

for ($i = 0; $i < 20; $i++)
{
	echo "$i\n";
	$ObjectToCreate = array();
	if (!$fp = fopen('test.ser', 'r'))
		return false;
	$ObjectToCreate = unserialize(fread ($fp, filesize ('test.ser')));
	fclose($fp);
}

I get the following output:

0
1
2
3
4
5
6
PHP Warning:  unserialize() failed at offset 2150380 of 3601223 bytes in test.inc on line 8
<font color=ff0000><br>
<b>Warning</b>:  unserialize() failed at offset 2150380 of 3601223 bytes in <b>test.inc</b> on line <b>8</b><br>
</font>7
8
9
10
11
PHP Warning:  unserialize() failed at offset 2822123 of 3601223 bytes in test.inc on line 8
<font color=ff0000><br>
<b>Warning</b>:  unserialize() failed at offset 2822123 of 3601223 bytes in <b>test.inc</b> on line <b>8</b><br>
</font>12
13
14
15
16
17
18
19

Repeatedly running the script produces different output each time with different numbers of failures at different offsets.  So far the lowest offset at which I have had a problem is about 650000.

I can supply the 'test.ser' file on request but for obvious reasons do not wish to include it in this error report!