douran7929 2014-08-05 08:58 采纳率: 100%
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使用PHP do / while语句

I'm attempting to write a simple do/while statement, that creates a random number and then checks if that number is below a certain threshold, if it is the while loop should be stopped. However it doesn't seem to work for me and i can't figure out why.

I'm guessing it's going to be something really simple but I have no clue at the moment.

Here is my code, help would be greatly appreciated!

<!DOCTYPE html>
<html>
    <head>
        <title>Your own do-while</title>
        <link type='text/css' rel='stylesheet' href='style.css'/>
    </head>
    <body>
    <?php
    $rayBans = rand(0,70);
    $correctPrice = false;
    do {
        echo "<p> Lets hope I can get ray bans for under £30! </p>";
    }
    while ($correctPrice == false);
        if ($rayBans > 30) {
        echo "<p> raybans at $rayBans are too expensive </p>";
        $correctPrice == false;
    }
    else if ($rayBans < 30){
        echo "<p> Finaly got my rayBans for $rayBans </p>";
        $correctPrice == true;
    }


    ?>
    </body>
</html>
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2条回答 默认 最新

  • douzhan1238 2014-08-05 09:18
    关注

    While Comparing we should be using == while assigning the value to a variable we need = so in your case 

    do 
{
//You should write something so that $correctPrice becomes true
//as of now it seems to be a infinite loop
echo "<p> Lets hope I can get ray bans for under £30! </p>";
}while ($correctPrice == false);

    I believe you need to do this

    <?php
    $correctPrice = false;
    do 
    {
        $rayBans = rand(0,70);
        echo "<p> Lets hope I can get ray bans for under £30! </p>";
        if ($rayBans > 30) 
        {
            echo "<p> raybans at $rayBans are too expensive </p>";
            $correctPrice = false;
        }
        else if ($rayBans < 30)
        {
            echo "<p> Finaly got my rayBans for $rayBans </p>";
            $correctPrice = true;
        }       
    }while ($correctPrice == false);

?>
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