Question

我的打印阵列无法正常工作。它在添加到数组之前回显$ articleID，因此变量不是null或任何东西。

然后我print_r（$ magIDArray）它只是回显出'Array（）';有人可以帮忙吗？

编辑：我已经调用了该函数，否则它不会回显函数中的变量 - 它是wouldent echo $ articleID，但它已经完成了

$sql = mysql_query("SELECT * FROM master_k2_categories WHERE parent = '$catid' ORDER 
BY id DESC");
while($row = mysql_fetch_array($sql)){
    $id = $row["id"];
    $name = $row["name"];
    getMagArticleID($id); 
}

$magIDArray = array();
function getMagArticleID($id){
    $magID = $id;
    $sqlID = mysql_query("SELECT * FROM master_k2_items WHERE catid = '$magID' ORDER BY id DESC");
    while($row = mysql_fetch_array($sqlID)){
        $articleID = $row["id"];
        echo '<br>', $articleID;
        $magIDArray[] = $articleID;
    }
}
print_r($magIDArray);

Answer 1

您需要使用global关键字：

   $magIDArray = array();
    function getMagArticleID($id){
    global $magIDArray ;
    $magID = $id;
        $sqlID = mysql_query("SELECT * FROM master_k2_items WHERE catid = '$magID' ORDER BY id DESC");
        while($row = mysql_fetch_array($sqlID)){
            $articleID = $row["id"];
            echo '<br>', $articleID;
            $magIDArray[] = $articleID;
        }
    }
    getMagArticleID($id);
    print_r($magIDArray);

看看变量范围：http://php.net/manual/en/language.variables.scope.php

Answer 2

您需要在尝试回显值之前运行您的功能

编辑：作为undone said - 您还必须使用全局变量或在函数中返回值

Answer 3

你错过了两件事：

1）忘记调用该函数。

2）忘记返回功能值。

更新的代码：

<?php    
function getMagArticleID($id){
 $magIDArray = array();
    $magID = $id;
    $sqlID = mysql_query("SELECT * FROM master_k2_items WHERE catid = '$magID' ORDER BY id DESC");
    while($row = mysql_fetch_array($sqlID)){
        $articleID = $row["id"];
        echo '<br>', $articleID;
        $magIDArray[] = $articleID;
    }
        return $magIDArray;
}

$magIDArray = getMagArticleID($id);
print_r($magIDArray);

Answer 4

你需要先调用这个函数，所以我会这样做：

$magIDArray = array();
function getMagArticleID($id){
    $magID = $id;
    $sqlID = mysql_query("SELECT * FROM master_k2_items WHERE catid = '$magID' ORDER BY id DESC");
    while($row = mysql_fetch_array($sqlID)){
        $articleID = $row["id"];
        echo '<br>', $articleID;
        $magIDArray[] = $articleID;
    }

    return $magIDArray;

}
$magIDfunction = getMagArticleID($id);
print_r($magIDfunction);

（UNTESTED）

Answer 5

试试这个：

$magIDArray = array();
function getMagArticleID($id){
    global $magIDArray;
    $magID = $id;
    $sqlID = mysql_query("SELECT * FROM master_k2_items WHERE catid = '$magID' ORDER BY id DESC");
    while($row = mysql_fetch_array($sqlID)){
        $articleID = $row["id"];
        echo '<br>', $articleID;
        $magIDArray[] = $articleID;
    }
    return $magIDArray;
}
getMagArticleID(*parameter*);
print_r($magIDArray);

Answer 6

你的数组在函数范围内被“填充”，因此它的值在全局范围内不可用。

您可以全局化var：

function getMagArticleID($id){
    global  $magIDArray;
    $magID = $id;
    $sqlID = mysql_query("SELECT * FROM master_k2_items WHERE catid = '$magID' ORDER BY id DESC");
    while($row = mysql_fetch_array($sqlID)){
        $articleID = $row["id"];
        echo '<br>', $articleID;
        $magIDArray[] = $articleID;
    }
}

或者您可以通过函数

返回数组

function getMagArticleID($id){
    $magIDArray=Array();
    $magID = $id;
    $sqlID = mysql_query("SELECT * FROM master_k2_items WHERE catid = '$magID' ORDER BY id DESC");
    while($row = mysql_fetch_array($sqlID)){
        $articleID = $row["id"];
        echo '<br>', $articleID;
        $magIDArray[] = $articleID;
    }
    return $magIDArray;
}
$magIDArray=getMagArticleID($id);

也就是说，除了其他替代方法，比如通过引用传递数组或将其全部包装在$ madIDArray是私有类var的类中，或将$ madIDArray声明为对象并让PDO获取绑定到对象的结果。但我相信你会使用最简单的解决方案。

PHP数组不打印

6 个答案: