Description:
------------
Using str_ireplace on array elements passed to a function causes PHP crash or apache(2.2.4) crash if the needle is not found.

In the repo code, if you use the line:

$record = array('DocumentDate' => '2007-03-02');

It will function correctly.

Workaround: use str_replace

Reproduce code:
---------------
function test($rec)
{
    $preped = array();
    $preped['DocumentDate'] = str_ireplace('-','',$rec['DocumentDate']);

    print ' prep okay? ';
    return $preped;
}


$record = array('DocumentDate' => '20070302');

print ' alive ';

$record = test($record);

print_r($record);

print ' alive ';

Expected result:
----------------
alive prep okay? Array ( [DocumentDate] => 20070302 ) alive 

Actual result:
--------------
php crash or apache crash referencing php5ts.dll