preg_replace 无法在循环内工作

Question

我正在解析一个 RSS 提要，我正在尝试删除其中一项的特定位以使其不显示。

<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>

基本上我想删除 <pre> 标签和它们之间的任何内容。

我正在使用以下 preg_replace:

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

它工作当我有包含我想删除的位的字符串作为 静态变量 ，但是当我尝试在RSS输出循环中替换它时，它不会:

    $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++;
    }

你可能会从上面写得不好的代码中看出我完全不知所措并且已经尝试了很多方法来完成这项工作。

描述（$desc）节点保持不变，即使我尝试将整个输出保存为变量（$htm） 然后运行 preg_replace.

有什么想法吗？

提前致谢。

Answer 1

要保存更改，您必须通过引用将其用作 &$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
}

应该可以。让我知道它是否仍然没有。

已编辑： 只需在上面的循环末尾添加 $item['description'] = $desc;。

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