第46行
        $act_attachname=substr($act_attachname,-60);
新版php就变成空值了。。

lanny at freemail dot hu
26-Jun-2007 06:31
Starting from version 5.2.3 if $start is negative and larger then the length of the string, the result is an empty string, while in earlier versions the result was the string itself!

substr ("abcdef", -1000);

result in 5.2.0
'abcdef'

result in 5.2.3
''

This is a small inconsistency, one of those things that makes the life of a PHP programmer like hell.
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