PHP指针相关函数

1.each

each — 返回数组中当前的键／值对并将数组指针向前移动一步

$arr = array("one", "two", "three");
reset($arr); ##记得重置数据指针
while (list($key, $value) = each($arr)) {
    echo "Key: $key; Value: $value<br />\n";
}
# 两者代码功能相同
foreach ($arr as $key => $value) {
    echo "Key: $key; Value: $value<br />\n";
}

2.list

list — 把数组中的值赋给一组变量 array list ( mixed $var1 [, mixed $... ] )   ,与array一样,同是语言结构.

$result = $pdo->query("SELECT id, name, salary FROM employees");

while (list($id, $name, $salary) = $result->fetch(PDO::FETCH_NUM)) {
    echo " <tr>\n" .
          "  <td><a href=\"info.php?id=$id\">$name</a></td>\n" .
          "  <td>$salary</td>\n" .
          " </tr>\n";
}