preg_replace内部循环不工作

Question

我正在解析一个RSS提要，我试图删除其中一个条目的一个特定部分，这样就不会显示它。

<pre>M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q1.htm M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q10.htm M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q11.htm M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q12.htm M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q13.htm M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q14.htm M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q15.htm M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q2.htm M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q3.htm M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q4.htm M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q5.htm M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q6.htm M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q7.htm M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q8.htm M /WITHHELD/WITHHELD/dist/gameserver/data/html-en/quests/_419_GetaPet/419_q9.htm M /WITHHELD/WITHHELD/dist/gameserver/data/scripts/quests/_128_PailakaSongofIceandFire.java M /WITHHELD/WITHHELD/dist/gameserver/data/scripts/quests/_129_PailakaDevilsLegacy.java M /WITHHELD/WITHHELD/dist/gameserver/data/scripts/quests/_144_PailakaInjuredDragon.java M /WITHHELD/WITHHELD/dist/gameserver/data/scripts/quests/_311_ExpulsionOfEvilSpirits.java M /WITHHELD/WITHHELD/dist/gameserver/data/scripts/quests/_312_TakeAdvantageOfTheCrisis.java M /WITHHELD/WITHHELD/dist/gameserver/data/scripts/quests/_642_APowerfulPrimevalCreature.java M /WITHHELD/WITHHELD/dist/gameserver/data/scripts/quests/_643_RiseAndFallOfTheElrokiTribe.java M /WITHHELD/WITHHELD/dist/gameserver/data/stats/items/15400-15499.xml M /WITHHELD/WITHHELD/dist/gameserver/data/stats/items/700-799.xml M /WITHHELD/WITHHELD/dist/gameserver/data/stats/npc/22600-22699.xml</pre>

本质上，我想移除<pre>标记和它们之间的任何东西。

我正在使用以下preg_replace

preg_replace("/(<pre>.*<\/pre>)/", "", $str);

当我的字符串包含我想作为静态变量删除的位时，它确实能工作，但是当我试图在RSS输出循环中替换它时，不工作。

    $i = 1;

    foreach($rs['items'] as &$item) {
    $arr = array($i);
    $a = array_fill_keys($arr, (string)$item['description']);
    $desc = (string)$a[$i];
    $desc = preg_replace("/(<pre>.*<\/pre>)/", "", $desc);

    echo "\t<li><a href=\"$item[link]\">(".$i.")".$item['title']."</a><br />";
    echo $desc;
    echo "</li>\n";
    $i++;
    }

从上面写得不好的代码可以看出，我完全不知所措，并且尝试过许多方法来完成这项工作。

description ($desc)节点保持不变，即使我试图将整个输出保存为变量($htm)，然后运行preg_replace。

有什么想法吗？

提前谢谢你。

Answer 1

要保存更改，您必须引用它作为&$item而不是$item，如下所示：

foreach($rs['items'] as &$item) //Pass by reference using "&"
{
 $arr = array($i);
 $a = array_fill_keys($arr, (string)$item['description']);
 $desc = (string)$a[$i];
 $desc = preg_replace("/(<pre>.*<\/pre>)/", "", $desc);

 $htm .= "\t<li><a href=\"$item[link]\">(".$i.")".$item['title']."</a><br />";
 $htm .= replace($desc);
 $htm .= "</li>\n";
 $i++;
 $item['description'] = $desc; //Add this
}

那应该管用。让我知道，如果它仍然没有。

编辑：只是在循环的末尾添加$item‘’description‘= $desc;，如上面所示。