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php中foreach和list循环语句实例

Jun 13, 2016 am 10:14 AM
foreach list php about and Example cycle article statement

文章重点讲到了关于foreach循环和list循环语句的用法,好了下面我们就来看实现吧,费话也不说多了有需要的同学可以参考一下。

最近买了本php和mysql web开发,看到数组循环语句。值得自己关注下,特此留点字迹,以便以后读阅。

一般foreach用的比较多

 代码如下 复制代码

    $price=array('apple'=>10,'orange'=>20,'banner'=>30);
    foreach($price as $key=>$value)
    {
        echo $key.'=>'.$value.'
';
    }
    echo '
';
?>

还有个更高级和常见的方法

 代码如下 复制代码

    $shuiguo=array('apple'=>10,'orange'=>20,'banner'=>30);
   
    while(list($changpin,$jiage)=each($shuiguo))
    {
        echo "$changpin=>$jiage".'
';
    }
?>

以前还真没怎么关注下,今天自己动手,还不错,又了解新的东西了,还是自己太菜了,哎

list()函数可以用来一个数组分解成一系列的值,允许为新变量命名。不懂list的
http://www.bKjia.c0m/phper/24/032a7c95555c423729b071aef4afd3c4.htm

两段代码输出是一样。

需要注意的是,当使用each()函数时候,数组将记录当前元素。如果希望在相同的脚本中使用两次该数组。就需要使用reset()降当前元素重新设置到数组开始处。

 代码如下 复制代码

    $price=array('apple'=>10,'orange'=>20,'banner'=>30);
    foreach($price as $key=>$value)
    {
        echo $key.'=>'.$value.'
';
    }
    echo '
';
    reset($price);
    while(list($key,$value)=each($price))
    {
        echo "$key=>$value","
";
    }
?>

这样就可以依然使用数组$price咯。 

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