php遍歷關聯數組方法大全(foreach,list,each,list)

在PHP中陣列分為兩類： 數字索引陣列和關聯陣列。

其中數字索引數組和C語言中的陣列一樣，下標是為0，1，2…
而關聯數組下標可能是任意類型，與其它語言中的hash，map等結構相似。

下面介紹PHP中遍歷關聯數組的幾種方法：
方法1：foreach

foreach ()是用來遍歷陣列中資料的最簡單有效的方法。

<?php 
$sports = array( 
&#39;football&#39; => &#39;good&#39;, 
&#39;swimming&#39; => &#39;very well&#39;, 
&#39;running&#39; => &#39;not good&#39;); 
foreach ($sports as $key => $value) { 
echo $key.": ".$value."<br />"; 
?>

輸出結果：

football: good 
swimming: very well 
running: not good

方法2：each

<?php 
$sports = array( 
&#39;football&#39; => &#39;good&#39;, 
&#39;swimming&#39; => &#39;very well&#39;, 
&#39;running&#39; => &#39;not good&#39;); 
while ($elem = each($sports)) { 
echo $elem[&#39;key&#39;].": ".$elem[&#39;value&#39;]."<br />"; 
?>

方法3：list & each 

<?php 
$sports = array( 
&#39;football&#39; => &#39;good&#39;, 
&#39;swimming&#39; => &#39;very well&#39;, 
&#39;running&#39; => &#39;not good&#39;); 
while (list($key, $value) = each($sports)) { 
echo $key.": ".$value."<br />"; 
?>

方法4：while() 和list()，each()配合使用。

<?php
    $urls= array(&#39;aaa&#39;,&#39;bbb&#39;,&#39;ccc&#39;,&#39;ddd&#39;);
    while(list($key,$val)= each($urls)) {
      echo "This Site url is $val.<br />";
    }
?>

顯示結果：

This Site url is aaa
This Site url is bbb
This Site url is ccc
This Site url is ddd

方法5：for()

<?php
    $urls= array(&#39;aaa&#39;,&#39;bbb&#39;,&#39;ccc&#39;,&#39;ddd&#39;);
    for ($i= 0;$i< count($urls); $i++){
      $str= $urls[$i];
      echo "This Site url is $str.<br />";
    }
?>

顯示結果：

This Site url is aaa
This Site url is bbb
This Site url is ccc
This Site url is ddd

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