Question

我是一个绿色的新手试图用PHP编写一个简单的程序。我使用HTML表单来询问＆＃34;晚餐＆＃34;选择一个主菜，将选择发送到PHP程序.PHP程序应该回应主菜选择，建议给餐馆喝一杯，然后告诉用餐者主菜，饮料的成本是多少 - 包括税和提示。

第一个功能select_beverage接受主菜的选择，并回应建议的饮料和饮料价格。然后调用函数wallet_buster来计算账单的纳税成本。然后，Wallet_buster()应该将纳税成本返回select_beverage()，而if/else又应将纳税成本返回给调用select_beverage的变量。

我可以得到这个程序的简化版本，但不是这个野兽。我的老师建议我将wallet_buster返回的值保存为变量，然后我会在return wallet_buster($steak_price, $steak_drink_price);级联结束时返回。我已尝试在此代码中遵循该建议，但它无效。我也试过了

if/else

在每个<?php echo "<h3>Thank you for dining at Elysium Excelsior</h3> "; function wallet_buster($entree_price, $drink_price) { $taxed_cost = 1.1 * ($entree_price + $drink_price); echo " "; return $taxed_cost; } function select_beverage($dinner) { $steak_price = 27.50; $steak_drink = "Justin Cabernet Sauvignon"; $steak_drink_price = 13.15; $salmon_price = 24.95; $salmon_drink = "Russian River Pinot Noir"; $salmon_drink_price = 12.25; $barbecue_pork_price = 22.99; $barbecue_pork_drink = "Dogfish Head 120 Minute IPA"; $barbecue_pork_drink_price = 7.99; $chicken_price = 21.50; $chicken_drink = "Blue Nun Sauvignon Blanc"; $chicken_drink_price = 12.25; if ($dinner == "1") { echo "The filet mignon pairs wonderfully with a glass of " . $steak_drink . at a price of $" . $steak_drink_price . ". "; echo " "; $receipt = wallet_buster($steak_price, $steak_drink_price); } else if ($dinner == "2") { echo "A glass of " . $salmon_drink . " for a luxuriously priced $" . $salmon_drink_price . " is a wonderful complement to our salmon."". "; echo " "; $receipt = wallet_buster($steak_price, $steak_drink_price); } else if ($dinner == "3") { echo "Try a pint of " . $barbecue_pork_drink . " for only $" . $barbecue_pork_drink_price . "."". "; echo " "; $receipt = wallet_buster($steak_price, $steak_drink_price); } else if ($dinner == "4") { echo "Stiller and Meara invite you to try " . $chicken_drink . " at $" . $chicken_drink_price . " per glass with the chicken!"". "; echo " "; $receipt = wallet_buster($steak_price, $steak_drink_price); } else { echo "Please select an entree from our drop-down menu and we will recommend a beverage suited to your choice."; echo " "; } return $receipt; } $dinner = $_GET["entree"]; $big_deal_meal = select_beverage($dinner); echo " "; echo "We encourage our patrons to tip well; given your menu selections, we ` `believe your bill should be : $" . (1.25 * $big_deal_meal); ?>函数中，但这两个函数都不起作用。

提前感谢您提供的任何启示！

wchar_t

Answer 1

这样的东西？

function select_beverage($dinner) {
    $steak_price = 27.50;
    $steak_drink = "Justin Cabernet Sauvignon"; 
    $steak_drink_price = 13.15; 

    $salmon_price = 24.95;
    $salmon_drink = "Russian River Pinot Noir"; 
    $salmon_drink_price = 12.25; 

    $barbecue_pork_price = 22.99;
    $barbecue_pork_drink = "Dogfish Head 120 Minute IPA";
    $barbecue_pork_drink_price = 7.99;

    $chicken_price = 21.50;
    $chicken_drink = "Blue Nun Sauvignon Blanc";
    $chicken_drink_price = 12.25;

    $selected_meal_price = NULL;
    $selected_drink_price = NULL;

    if ($dinner == "1") { 
        echo "The filet mignon pairs wonderfully with a glass of " . $steak_drink . "at a price of $" . $steak_drink_price . ".<br/>";
        echo "<br/>";
        $selected_meal_price = $steak_price;
        $selected_drink_price = $steak_drink_price;
    }
    else if ($dinner == "2") {    
        echo "A glass of " . $salmon_drink . " for a luxuriously priced $" .  $salmon_drink_price . " is a wonderful complement to our salmon<br/>"; 
        echo "<br/>";
        $selected_meal_price = $salmon_price;
        $selected_drink_price = $salmon_drink_price;
    }
    else if ($dinner == "3") { 
        echo "Try a pint of " . $barbecue_pork_drink . " for only $" . $barbecue_pork_drink_price . ".<br/>"; 
        echo "<br/>";
        $selected_meal_price = $barbecue_pork_price;
        $selected_drink_price = $barbecue_pork_drink_price;
    }
    else if ($dinner == "4") { 
        echo "Stiller and Meara invite you to try " . $chicken_drink . " at $" . $chicken_drink_price . " per glass with the chicken!.<br/>"; 
        echo "<br/>";
        $selected_meal_price = $chicken_price;
        $selected_drink_price = $chicken_drink_price;
    }
    else {
        echo "Please select an entree from our drop-down menu and we will recommend a beverage suited to your choice.";
        echo "<br/>";
    }

    if(!is_null($selected_meal_price) && !is_null($selected_drink_price)) {
        $receipt = wallet_buster($selected_meal_price, $selected_drink_price);
    }

    return $receipt;
}

Answer 2

你的代码大部分都在工作，你只是放错了一些引号和连接。在不需要添加引号的地方添加引号会导致PHP误解代码。您可以考虑使用代码编辑器或IDE来避免将来出现这种情况。他们会突出显示您的代码，以便在您错过报价时提醒您。像Netbeans这样的IDE会不断检查代码中的语法错误。

在PHP配置中启用错误报告还会为您提供有关脚本中出现问题的有用提示。

以下是工作代码：

<?php

echo "<h3>Thank you for dining at Elysium Excelsior</h3><br>";

function wallet_buster($entree_price, $drink_price) {

$taxed_cost = 1.1 * ($entree_price + $drink_price);
echo "<br/>";

return $taxed_cost;

}



function select_beverage($dinner) {

$steak_price = 27.50;
$steak_drink = "Justin Cabernet Sauvignon"; 
$steak_drink_price = 13.15; 

$salmon_price = 24.95;
$salmon_drink = "Russian River Pinot Noir"; 
$salmon_drink_price = 12.25; 

$barbecue_pork_price = 22.99;
$barbecue_pork_drink = "Dogfish Head 120 Minute IPA";
$barbecue_pork_drink_price = 7.99;

$chicken_price = 21.50;
$chicken_drink = "Blue Nun Sauvignon Blanc";
$chicken_drink_price = 12.25; 

if ($dinner == "1") { 
echo "The filet mignon pairs wonderfully with a glass of " . $steak_drink . "
at a price of $" . $steak_drink_price . ".<br/>";
echo "<br/>";
$receipt = wallet_buster($steak_price, $steak_drink_price);

}

else if ($dinner == "2") {    
echo "A glass of " . $salmon_drink . " for a luxuriously priced $" .
                 $salmon_drink_price . " is a wonderful complement to our salmon <br/>"; 
echo "<br/>";
$receipt = wallet_buster($steak_price, $steak_drink_price);    
}

else if ($dinner == "3") { 
echo "Try a pint of " . $barbecue_pork_drink . " for only $" .
$barbecue_pork_drink_price . ". <br/>"; 
echo "<br/>";
$receipt = wallet_buster($steak_price, $steak_drink_price);
}

else if ($dinner == "4") { 
echo "Stiller and Meara invite you to try " . $chicken_drink . " at $" . 
$chicken_drink_price . " per glass with the chicken! <br/>"; 
echo "<br/>";
$receipt = wallet_buster($steak_price, $steak_drink_price);
}

else {
echo "Please select an entree from our drop-down menu and we will recommend
a beverage suited to your choice.";
echo "<br/>";
}

return $receipt;

}

$dinner = $_GET["entree"];



$big_deal_meal = select_beverage($dinner);



echo "<br>";
echo "We encourage our patrons to tip well; given your menu selections, we believe your bill should be : $" . (1.25 * $big_deal_meal);
?>

另请注意，您无需连接（使用＆＃39;。＆＃39;）文本和html。只有当你在PHP代码中混合变量时才会这样。

所以："" . "I am a string" . " ";是不必要的。这个："I am a string ";很好，更容易阅读。

Answer 3

正如其他人所指出的那样，你几乎就在那里。您可能还需要注意，如果您使用双引号字符串（“）而不是单引号（'），则php将解释其中的变量。

$var = 3;
echo "The value of var is $var"; //The value of var is 3

当然，当你需要实际的美元符号（\ $）时，你还需要记住逃避$ for。您还可以考虑使用sprintf使输出更清晰。

另一个有用的提示是进入终端并运行php -l <file>以检查语法错误。

<?php

echo "<h3>Thank you for dining at Elysium Excelsior</h3><br>";

function wallet_buster($entree_price, $drink_price) {
    $taxed_cost = 1.1 * ($entree_price + $drink_price);
    echo "<br/>";

    return $taxed_cost; 
}

function select_beverage($dinner) {
    $steak_price = 27.50;
    $steak_drink = "Justin Cabernet Sauvignon"; 
    $steak_drink_price = 13.15; 

    $salmon_price = 24.95;
    $salmon_drink = "Russian River Pinot Noir"; 
    $salmon_drink_price = 12.25; 

    $barbecue_pork_price = 22.99;
    $barbecue_pork_drink = "Dogfish Head 120 Minute IPA";
    $barbecue_pork_drink_price = 7.99;

    $chicken_price = 21.50;
    $chicken_drink = "Blue Nun Sauvignon Blanc";
    $chicken_drink_price = 12.25; 

    if ($dinner == "1") { 
        echo "The filet mignon pairs wonderfully with a glass of $steak_drink at a price of \$ $steak_drink_price .<br/>";
        echo "<br/>";
        $receipt = wallet_buster($steak_price, $steak_drink_price);
    }
    else if ($dinner == "2") { 
        echo "A glass of $salmon_drink for a luxuriously priced \$ $salmon_drink_price is a wonderful complement to our salmon.<br/>"; 
        echo "<br/>";
        $receipt = wallet_buster($steak_price, $steak_drink_price); 
    }
    else if ($dinner == "3") { 
        echo "Try a pint of $barbecue_pork_drink for only \$ $barbecue_pork_drink_price.<br/>"; 
        echo "<br/>";
        $receipt = wallet_buster($steak_price, $steak_drink_price);
    }
    else if ($dinner == "4") { 
        echo "Stiller and Meara invite you to try $chicken_drink at \$ $chicken_drink_price per glass with the chicken!<br/>"; 
        echo "<br/>";
        $receipt = wallet_buster($steak_price, $steak_drink_price);
    }
    else {
        echo "Please select an entree from our drop-down menu and we will recommend a beverage suited to your choice.";
        echo "<br/>";
    }

    return $receipt;

}

$dinner = $_GET["entree"];

$big_deal_meal = select_beverage($dinner);

echo "<br>";
echo "We encourage our patrons to tip well; given your menu selections, we` `believe your bill should be : $" . (1.25 * $big_deal_meal);

?>

祝你O'Reilly课程的其余部分好运。

如何从PHP中的第二个函数返回值？

3 个答案: