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在PHP中循环访问此数组的最佳方法是什么？

php arrays loops printing

2022-08-30 06:44:49

我有这个阵列...如何打印每个文件路径和文件名？最好的方法是什么？

  Array (
    [0] => Array (
             [fid] => 14
             [list] => 1
             [data] => Array (
                         [alt] =>
                         [title] =>
                       )
             [uid] => 1
             [filename] => trucks_10785.jpg
             [filepath] => sites/default/files/trucks_10785.jpg
             [filemime] => image/jpeg
             [filesize] => 143648
             [status] => 1
             [timestamp] => 1291424171
             [nid] => 8
           )
    [1] => Array (
             [fid] => 19
             [list] => 1
             [data] => Array (
                         [alt] =>
                         [title] =>
                       )
             [uid] => 1
             [filename] => school.jpg
             [filepath] => sites/default/files/school.jpg
             [filemime] => image/jpeg
             [filesize] => 115355
             [status] => 1
             [timestamp] => 1292029563
             [nid] => 8
           )
    [2] => Array (
             [fid] => 20
             [list] => 1
             [data] => Array (
                         [alt] =>
                         [title] =>
                       )
             [uid] => 1
             [filename] => Life_is_wonderful_by_iNeedChemicalX.jpg
             [filepath] => sites/default/files/Life_is_wonderful_by_iNeedChemicalX_0.jpg
             [filemime] => image/jpeg
             [filesize] => 82580
             [status] => 1
             [timestamp] => 1292029572
             [nid] => 8
           )
    [3] => Array (
             [fid] => 21
             [list] => 1
             [data] => Array (
                         [alt] =>
                         [title] =>
                       )
             [uid] => 1
             [filename] => school_rural.jpg
             [filepath] => sites/default/files/school_rural.jpg
             [filemime] => image/jpeg
             [filesize] => 375088
             [status] => 1
             [timestamp] => 1292029582
             [nid] => 8
           )
  )

答案 1

使用不带键的循环：foreach

foreach($array as $item) {
    echo $item['filename'];
    echo $item['filepath'];

    // To know what's in $item
    echo '<pre>'; var_dump($item);
}

使用带键的循环：foreach

foreach($array as $i => $item) {
    echo $array[$i]['filename'];
    echo $array[$i]['filepath'];

    // $array[$i] is same as $item
}

使用循环：for

for ($i = 0; $i < count($array); $i++) {
    echo $array[$i]['filename'];
    echo $array[$i]['filepath'];
}

var_dump是获取数组或对象快照的非常有用的函数。

答案 2

对于更特殊的情况，您也可以使用以下方法：

array_map(function($n) { echo $n['filename']; echo $n['filepath'];}, $array);

或者以更不复杂的方式：

function printItem($n){
    echo $n['filename'];
    echo $n['filepath'];
}

array_map('printItem', $array);

这将允许您以更简单的方式操作数据。

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