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中遍历关联数组的几种方法:
方法1:foreach
foreach()是一个用来遍历数组中数据的最简单有效的方法。
<?php $sports = array( 'football' => 'good', 'swimming' => 'very well', 'running' => 'not good'); foreach ($sports as $key => $value) { echo $key.": ".$value."<br />"; ?>
输出结果:
football: good swimming: very well running: not good
方法2:each
<?php $sports = array( 'football' => 'good', 'swimming' => 'very well', 'running' => 'not good'); while ($elem = each($sports)) { echo $elem['key'].": ".$elem['value']."<br />"; ?>
方法3:list & each
<?php $sports = array( 'football' => 'good', 'swimming' => 'very well', 'running' => 'not good'); while (list($key, $value) = each($sports)) { echo $key.": ".$value."<br />"; ?>
方法4:while() 和 list(),each()配合使用。
<?php $urls= array('aaa','bbb','ccc','ddd'); while(list($key,$val)= each($urls)) { echo "This Site url is $val.<br />"; } ?>
显示结果:
This Site url is aaa This Site url is bbb This Site url is ccc This Site url is ddd
方法5:for()
<?php $urls= array('aaa','bbb','ccc','ddd'); for ($i= 0;$i< count($urls); $i++){ $str= $urls[$i]; echo "This Site url is $str.<br />"; } ?>
显示结果:
This Site url is aaa This Site url is bbb This Site url is ccc This Site url is ddd
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