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PHP 数组遍历方法大全(foreach,list,each)

WBOY
Release: 2016-06-06 20:34:35
Original
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php下最灵活的东西都是数组,很多数据都是通过数组的方式显示,这里整理下数组的遍历方法,大家可以根据需要选用。

在PHP中数组分为两类: 数字索引数组和关联数组。
其中数字索引数组和C语言中的数组一样,下标是为0,1,2…
而关联数组下标可能是任意类型,与其它语言中的hash,map等结构相似。

下面介绍PHP中遍历关联数组的三种方法:

方法1:foreach

代码如下:
$sports = array(
'football' => 'good',
'swimming' => 'very well',
'running' => 'not good');
foreach ($sports as $key => $value) {
echo $key.": ".$value."
";
?>

输出结果:

football: good
swimming: very well
running: not good

方法2:each

代码如下:
$sports = array(
'football' => 'good',
'swimming' => 'very well',
'running' => 'not good');
while ($elem = each($sports)) {
echo $elem['key'].": ".$elem['value']."
";
?>


方法3:list & each
代码如下:
$sports = array(
'football' => 'good',
'swimming' => 'very well',
'running' => 'not good');
while (list($key, $value) = each($sports)) {
echo $key.": ".$value."
";
?>
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