在多维数组中搜索特定键并输出其数据 - Search multidimensional arrays for specific keys and output their data

Search multidimensional arrays for specific keys and output their data

本文关键字：输出数据数组搜索 | 更新日期: 2023-09-27

我有以下数组结构： $array[$certain_key][some_text_value]

在 while 循环中，我想打印数组中的数据，其中 $certain_key 是一个特定的值。

我知道如何遍历多维数组，这不是这个问题的完整解决方案：

foreach ($a as $v1) {
    foreach ($v1 as $v2) {
        echo "$v2'n";
    }
}

我不想每次都循环整个数组，而只是在匹配$certain_key时循环。

编辑：更准确地说，这就是我要做的：

$array[$array_key][some_text];
while reading from db {
  //print array where a value returned from the db = $array_key
}

while ($row = fetch()) {
   if (isset($array[$row['db_id']])) {
      foreach ($array[$row['db_id']] as $some_text_value => $some_text_values_value) {
         echo ...
      }
   }
}

foreach ($array as $certain_key => $value) {
    if($certain_key == $row['db_id']) {
        foreach ($value as $some_text_value) {
            echo "$v2'n";
        }
    }
}

你的意思是像

foreach($array[$certain_key] as $k => $v)
{
     do_stuff();
}

？

也许你正在寻找array_key_exists？它的工作原理是这样的：

if(array_key_exists($certain_key, $array)) {
   // do something
}

<?php
foreach ($a as $idx => $value) {
    // replace [search_value] with whatever key you are looking for
    if ('[search_value]' == $idx) {
        // the key you are looking for is stored as $idx
        // the row you are looking for is stored as $value
    }
}