循环通过数组PHP

Question

我有这个数组...你怎么打印每个文件路径和文件名？这样做的最佳方式是什么？

  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 
           ) 
  ) 

Answer 1

使用不带密钥的foreach循环

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

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

使用带密钥的foreach循环

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

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

使用for循环

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。

Answer 2

好的，我知道有一个已接受的答案但是...对于更多特殊情况，你也可以使用这个：

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

或者以更复杂的方式：

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。

Answer 3

从简单开始，没有HTML：

foreach($database as $file) {
    echo $file['filename'] . ' at ' . $file['filepath'];
}

你可以操纵foreach中的字段。

Answer 4

foreach($array as $item=>$values){
     echo $values->filepath;
    }

Answer 5

您也可以使用此方法而无需创建其他变量，也无需像foreach（）那样将数据复制到内存中。

while (false !== (list($item, $values) = each($array)))
{
    ...
}