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:
<?php $sports = array( 'football' => 'good', 'swimming' => 'very well', 'running' => 'not good' ); foreach ($sports as $key => $value) { echo $key.": ".$value."<br />"; } ?>
程序运行结果:
football: good swimming: very well running: not good
<?php $sports = array( 'football' => 'good', 'swimming' => 'very well', 'running' => 'not good' ); while ($elem = each($sports)) { echo $elem['key'].": ".$elem['value']."<br />"; } ?>
程序运行结果:
football: good swimming: very well running: not good
<?php $sports = array( 'football' => 'good', 'swimming' => 'very well', 'running' => 'not good' ); while (list($key, $value) = each($sports)) { echo $key.": ".$value."<br />"; } ?>
程序运行结果:
football: good swimming: very well running: not good