Windows上的Apache/PHP与正则表达式崩溃

Question

我发现以下PHP代码在Windows Apache服务器上运行时崩溃:

<?php

$test = "0,4,447,11329,316,415,142,5262,6001,9527,11259,11236,1140,9770,9177,9043,11090,268,5270,9907,9196,10226,".
        "9399,1476,9368,6929,1659,11074,10869,8774,739,11344,10482,6399,8910,8997,11198,137,10148,10371,5128,767,2483,".
        "211,9973,10726,9299,778,11157,9497,275,9418,11141,241,5288,11324,776,10960,9289,7944,222,10686,11428,9723,".
        "10615,11399,9869,9083,10180,10043,9957,9387,9215,8869,9667,10174,10902,6607,9282,1259,395,10411,152,9344,8949,".
        "10923,8976,11042,11519,10704,10979,216,10044,9201,1721,5831,881,9721,1757,11054,1335,6151,9526,9081,111,498,".
        "2960,438,5313,206,318,10820,8192,6039,9161,11012,1717,1360,10757,4314,11280,9647,9346,10546,11006,9553,10365,".
        "6148,10565,4532,2776,4124,8853,6145,478,4539,540,9981,726,7186,11122,324,10524,1139,7900,9581,6869,1724,10851,".
        "10059,10018,11032,1290,3818,782,796,917,8740,6935,11439,10799,10948,249,2068,8778,6289,295,2766,9425,791,309,".
        "4753,10418,771,260,10835,10441,6434,10164,10475,10842,9013,11224,2247,8972,2141,2078,2152,475,9077,6291,10285,".
        "8067,753,6660,10889,431,2503,6007,9180,810,11447,2461,3689,7104,10150,10921,895,10598,747,10570,305,4497,11055,".
        "11496,10938,10722,8761,10086,11482,6780,6685,6918,10286,10659,9996,4074,9118,907,5192,283,2230,8884,6966,".
        "8820,8132,3598,9599,6796,11257,7049,5992,8637,4168,9017,7950,7165,10721,10037,1071,8044,759,11429,6380,".
        "10239,1593,9455,9704,10357,6737,2958,4051,9754,6564,11407,8716,7485,1528,6857,7406,9579,7259,1609,7820,".
        "4448,10289,1123,7005,8123,9316,914,9655,5280,9710,7822,510,10795,10476,8706,6160,8248,6978,9300,10643,".
        "7106,10250,519,7860,4733,904,8773,4714,8695,8633,6105,3312,11548,9580,10389,4886,4587,513,8485,4606,".
        "6471,581,526,637,3523,3772,3153,9336,9120,7633,3755,10087,524,10015,8563,556,1230,570,3652,569"
        .",8473,10209,3886,573,5363,4715,3865,9452,1218,7066,575,577,4724,7655"
        ;

$hest = preg_match('/^\d+(?:,\d+)+$/', $test);
var_dump($hest);
?>

有趣的是,如果字符串更短,代码就可以工作 - 如果我注释掉字符串的最后一部分(行),代码就会运行并按预期工作.

但是,由于代码在此处显示,代码会导致Apache崩溃并重新生成 - 不记录任何错误.如果我尝试直接通过PHP运行代码,它按预期工作,所以问题与Apache有某种关系.

我已经尝试了"pcre.recursion_limit"设置,并发现如果我将其降低到689它不会死,而是preg_match()调用失败并带有PREG_RECURSION_LIMIT_ERROR.对于更高的pcre.recursion_limit值,Apache死了.

Apache 2.2.11 PHP 5.3.0

我也在Debian服务器上测试了这个,我没有看到错误,并且在Windows上使用不同版本的PHP和Apache,如上所述发生错误,因此它似乎与Windows相关.

以前有人看过这个吗？我真的想要某种暗示!

更新:我是因为Apache for Windows中的一个"错误" - 好吧,不是真正的错误,但似乎Apache使用小堆栈编译,并且当PHP使用它时导致PCRE中出现此错误.见http://bugs.php.net/bug.php?id=47689

Answer 1

降低“pcre.recursion_limit”总是一个好主意，因为默认的高值可能会损坏进程堆栈（请参阅http://php.net/manual/en/pcre.configuration.php） - 这正是发生的情况你的 mod_php 安装。由于 preg 函数在达到递归/回溯限制时不会抛出错误，因此拥有像这样的包装器可能会很有用

function match($re, $text) {
    preg_match($re, $text, $m);
    if(preg_last_error())
         trigger_error("preg: " . preg_last_error());
    return $m;
 }

至少，当出现问题时，这可以让您知道。

除此之外，尽可能尝试简化您的模式，例如/^\d[\d,]*\d$/与上面相同，但零递归。