小编cod*_*gon的帖子

我在w3schools上阅读了以下内容,我不明白第二部分意味着什么:

[全局变量]仍可用于加载到同一窗口中的新页面.

谁能开导我？

在Web浏览器中,当您关闭浏览器窗口(或选项卡)时,将删除全局变量,但仍可用于加载到同一窗口中的新页面.

链接:https://www.w3schools.com/js/js_scope.asp

我在本地主机上有一个名为webshop的数据库，其中有多个表。当我运行查询时：SELECT COUNT (userId) FROM users;

它引发以下错误：

FUNCTION webshop.COUNT does not exist. Check the 'Function Name Parsing and Resolution' section in the Reference Manual

我不知道为什么查询对我来说很好，有人吗？

我有以下 PHP 代码，它通过键名称搜索数组并返回等于搜索的结果。只是出于好奇，我该怎么做，无论我搜索什么结果都会是名称键值等于“A”的元素？很快我怎样才能检索名称为“A”的元素？

我尝试了以下方法，但 \xc2\xb4t 有效：

$jSearchResult[] = $ajProducts[$i]->name = "A";\n

请帮助我，因为我只能\xc2\xb4t弄清楚如何通过键值检索数组的元素，但我确信它一定是非常简单的。

<?php\n\n//DATA coming from the BROWSER\n$sSearch = $_GET[\'search\'];\n//TURN it into UPPERCASE\nstrtoupper( $sSearch );\n\n//GETTING from the TEXT FILE:\n$sajProducts = file_get_contents( \'products.txt\' );\n$ajProducts = json_decode( $sajProducts );\n\n$match_found = false;\n//Collect all matching result in an array \n$jSearchResult = array();\n//LOOPING THROUGH THE ARRAY OF PRODUCTS\nfor ( $i=0; $i< count( $ajProducts ); $i++ ) {\n\n    if ( $sSearch == $ajProducts[$i]->name ) {\n         $jSearchResult[] = $ajProducts[$i]->name;\n         $match_found = true;    \n    }\n}\n//if …

我有以下数组，我希望能够从JSON对象中删除所有“ phonenumber”键以及它的值。仅键“ phonenumber”不是整个对象。我怎样才能做到这一点？

[
    {
        "role": "admin",
        "id": "59df4ef2d8d39",
        "email": "a@a.dk",
        "name": "A",
        "lastname": "A",
        "password": "1",
        "image": "img_webshop\/userimage-59dfb91515810.png"
    },
    {
        "role": "user",
        "id": "59df4f1b070e6",
        "phonenumber": "12345678",
        "name": "B",
        "lastname": "B",
        "password": "2",
        "image": "img_webshop\/userimage-59e37de69475b.png"
    },
    {
        "role": "user",
        "id": "59dfc0cb07985",
        "email": "c@c.dk",
        "name": "C",
        "lastname": "C",
        "password": "3",
        "image": "img_webshop\/userimage-59dfc0cb06c5f.png"
    },
    {
        "role": "user",
        "id": "59dfc22f26f78",
        "phonenumber": "87654321",
        "name": "D",
        "lastname": "D",
        "password": "4",
        "image": "img_webshop\/userimage-59dfc22f2638d.png"
    },
    {
        "role": "user",
        "id": "59dfc460b261e",
        "email": "e@e.dk",
        "name": "E",
        "lastname": "E",
        "password": …