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Homephp教程PHP源码php foreach 遍历数组的例子

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foreach循环是一种变异的For循环,并允许您遍历数组中的元素。有两个不同版本的

foreach循环。 foreach循环的语法如下:

foreach (array as value)
{
   code to be executed;
}
   
foreach (array as key => value)
{
   code to be executed;
}
下面的例子演示了foreach循环,将打印给定数组的值:

$email = array('john.smith@example.com', 'alex@example.com');
foreach ($email as $value) {
   echo "Processing ".$value."
";
}
?>

PHP的执行每个元素美元,反过来电子邮件循环体一次,美元值设置为当前元素。元素

处理其国内秩序。循环继续,直到达到foreach循环的最后一个元素或上给定数组的约

束。

$person = array('name' => 'Andrew', 'age' => 21, 'address' => '77, Lincoln

st.');
foreach ($person as $key => $value) {
   echo $key." is ".$value."
";
}
?>

在这种情况下,对每个元素的关键是放置在$键和相应的值是$的重视。

在foreach构造不营业数组本身,而是它的一个副本。在每次循环中,变量$值的值可

以操作,但该数组的原始值保持不变。

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