PHP中的可變麻煩

Question

我試圖通過一種自動化功能在我的網站上制作“卡片”，由於某種原因，它說我沒有在第18行定義數組，即使它是在3上定義的。

這是錯誤：

Notice: Undefined variable: cardArray in 
E:\XAMPP\htdocs\Websites\website\pages\featured.php on line 18

Notice: Undefined variable: cardArray in 
E:\XAMPP\htdocs\Websites\website\pages\featured.php on line 18

這是代碼：

<?php

$cardArray = array();   

newCard("Eltit", "This is some interesting text that everyone wants to read because it is awesome. The said this is, is that people might not be able to comprehend it.", "James.png");
newCard("Eltit 2!", "This is just some more interesting works to feast your eyes on mainly because this website doesn't have any content to fill it up yet :)");

for ($i=1; $i < count($cardArray); $i++) { 
    makeCard($cardArray[i][0], $cardArray[i][1], $cardArray[i][2]);
}

//<<--    Functions    -->>//

function newCard($title = "Title", $text = "Text", $avatar = "DefaultUserIcon.png") {

    $tempArray = array($title, $text, $avatar);

    $cardArray[count($cardArray)+1] = $tempArray;

}

function makeCard($title, $text, $avatar) {

    echo "
        <div class='box'>
            <div id='profile' style='background: url('../img/avatars/".$avatar."');'>
                <div id='avatar'></div>
                <div id='info'>
                    This is where the user info will go.
                </div>
            </div>
            <div id='content'>
                <div id='description'> 
                    <h1>".$title."</h1>
                    ".$text."
                </div>
            </div>
            <div id='footer'>
                <div style='padding: 18px;'>
                    This is where the buttons will be.
                </div>
            </div>
        </div>";

}
?>

Answer 1

您的$cardArray變量在全局范圍內。 為了在函數中使用，您需要將其聲明為global函數：

function newCard($title = "Title", $text = "Text", $avatar = "DefaultUserIcon.png") {
    global $cardArray;

    $tempArray = array($title, $text, $avatar);
    $cardArray[count($cardArray)+1] = $tempArray;
}

雖然這可以解決您的問題。 建議不要使用global ，建議將它們作為參數傳遞給函數。

例：

function newCard($title = "Title", $text = "Text", $avatar = "DefaultUserIcon.png", $cardArray) {
    $tempArray = array($title, $text, $avatar);
    $cardArray[count($cardArray)+1] = $tempArray;
}

然后所有調用者都將$cardArray傳遞給newCard函數，如下所示：

newCard("Eltit", "This is some interesting text that everyone wants to read because it is awesome. The said this is, is that people might not be able to comprehend it.", "James.png", $cardArray);