7 三章 控制结构 if else while for foreach

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控制结构
1.条件语句 if elseif else switch
2.循环语句 while for foreach

if elseif else

$secretNumber = 453;
    if($_POST['guess'] == $secretNumber)
    {
        echo "Congratulation!";
    }
    elseif($_POST['guess' == 412])
    {
        echo "xx";
    }
    else
    {
        echo "sorry !!";
    }

switch

$category = "news";
    switch($category)
    {
        case "news":
            echo "hello news ";
            break;
        case "sports":
            echo "hello sports ";
            break;
        default:
            echo "welocome to my web site";
    }

while for

$count = 1;
    while($count < 5)
    {
        printf("%d squard is %d ",$count,pow($count,2));
        $count++;
    }

    echo "";

    $count = 1;
    for($count=1;$count < 5; $count++)
    {
        printf("%d squard is %d ",$count,pow($count,2));
    }

foreach

$links = array("","");
    echo "online resources";
    foreach($links as $link)
    {
        echo "link is $link ";
    }

online resources
link is www.chinaunix.net
link is www.csdn.net