PHP 关联数组遍历方法大全
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
4 |
'swimming' => 'very well' , |
5 |
'running' => 'not good' ); |
6 |
foreach ( $sports as $key => $value ) { |
7 |
echo $key . ": " . $value . "<br />" ; |
输出结果:
football: goodswimming: very wellrunning: not good
方法2:each
4 |
'swimming' => 'very well' , |
5 |
'running' => 'not good' ); |
6 |
while ( $elem = each( $sports )) { |
7 |
echo $elem [ 'key' ]. ": " . $elem [ 'value' ]. "<br />" ; |
方法3:list & each
4 |
'swimming' => 'very well' , |
5 |
'running' => 'not good' ); |
6 |
while (list( $key , $value ) = each( $sports )) { |
7 |
echo $key . ": " . $value . "<br />" ; |