PHP的 foreach each list

<?php
 
/*foreach (函数名 as 地址下标 => 该下标对应的数值)
$arr = [&#39;a&#39;,&#39;b&#39;,&#39;c&#39;,&#39;d&#39;,&#39;e&#39;,&#39;f&#39;,&#39;g&#39;];
foreach( $arr as $key=>$val) {
var_dump($key.&#39;--------&#39;.$val.&#39;<br  />&#39;);

}

  $arr = ['a','b','c','d','e','f','g'];

   list($a,$b,$c,$d,$e) = $arr;

   var_dump($a,$b,$c,$d,$e);

  $arr = ['abc','b','c','d','e','f','g'];
  var_dump(each($arr));
    var_dump(each($arr));
  var_dump(each($arr));
    var_dump(each($arr));
  var_dump(each($arr));

 $arr = ['abc','b','c','d','e','f','g'];
list($key,$val) = each($arr);
var_dump($key,$val);
    list($key,$val) = each($arr);
var_dump($key,$val);
list($key,$val) = each($arr);
var_dump($key,$val);
list($key,$val) = each($arr);
var_dump($key,$val);
?>
*/