使用串行逗号/array_pop时不满足if条件

Question

新手在做一个简单的回帖表单(实际上对我来说很复杂)。我的目标是，如果只选择了一项，'and‘这个词就不会打印出来。当选择了三个或更多的内容时，文件工作得很好，因为它去掉了最后一个逗号，但如果它只是最后一个元素，那么我想去掉'and...‘。所以只打印最后一个元素。

我试着计算出一个if else语句，但是我没有得到它。谢谢你的帮助--我只是想把我的小实验做得更好一点。

<?php
    define('THIS_PAGE', basename($_SERVER['PHP_SELF']));//shows webroot

    if(isset($_POST['submit3'])){ //proces form - catches the post info when submit clicked

    $arr = $_POST['sundae'];
    $lastElement = array_pop($arr);

    if ($arr == ""){$myReturn = "stuff"; echo $myReturn;}
    else
    {$myReturn = "<span style=\"color:red; font-weight: bold\">You have selected: " . implode(', ',$arr)." and ".$lastElement;
    $myReturn .= "</span> <br />";
    $myReturn .= '<input type="button" value="Reload page" onclick="reloadPage()" >';
    echo $myReturn;}
    }else{// show the form if no posties
        echo
        '
        <form action="myTest.php" method ="post">
            Select a size:<br />
            <input type="checkbox" name="sundae[]" value="One Scoop"> One Scoop<br />
            <input type="checkbox" name="sundae[]" value="Two Scoops"> Two Scoops<br />
            <input type="checkbox" name="sundae[]" value="Three Scoops"> Three Scoops<br />

            <hr ><br />

            Select a flavor:<br />
            <input type="checkbox" name="sundae[]" value="Chocolate">Chocolate<br />
            <input type="checkbox" name="sundae[]" value="Coffee">Coffee<br />
            <input type="checkbox" name="sundae[]" value="Double Fudge">Double Fudge<br />

            <hr ><br />

            Select your Toppings:<br />
            <input type="checkbox" name="sundae[]" value="Applesauce">Applesauce<br />
            <input type="checkbox" name="sundae[]" value="Blueberries">Blueberries<br />


            <input type="checkbox" name="sundae[]" value="Bubblegum">Bubblegum<br />

            <input type="checkbox" name="sundae[]" value="Caramel">Caramel<br />
            <input type="checkbox" name="sundae[]" value="Hot Fudge">Hot Fudge<br />
            <input type="checkbox" name="sundae[]" value="Gummy Bears">Gummy Bears<br />

            Select a Whip:<br />
            <input type="checkbox" name="sundae[]" value="Double Whipped Cream">Double Whipped Cream<br />
            <input type="checkbox" name="sundae[]" value="Marishino Cherry">Vanilla Whipped Cream<br />
            <input type="checkbox" name="sundae[]" value="Whipped Cream">Whipped Cream<br />

            <hr ><br />

            Select a Cherry:<br />
            <input type="checkbox" name="sundae[]" value="Black Cherry">Black Cherry<br />
            <input type="checkbox" name="sundae[]" value="Frozen Lake Cherry">Frozen Lake Cherry<br />
            <input type="checkbox" name="sundae[]" value="Marishino Cherry">Marishino Cherry<br />
            <br />
            <hr ><br />

            Wopuld you like to add one "waffer-thin" mint? (No charge)<br />
            <input type="checkbox" name="sundae[]" value="Wafer-Thin Mint">Yes<br />
            <br />
            <input type="submit" name="submit3" >
        </form>
        ';
    }
?>

Answer 1

我想你是在说，如果只有两个元素你不想要and？如果是这样的话：

else
{
  //> 1 because we already popped the last element
  if (count($arr) > 1) $lastElement = " and " . $lastElement;
  $myReturn = "<span style=\"color:red; font-weight: bold\">You have selected: " . implode(', ',$arr).$lastElement;