Some PHP objects such as instances of DateTime can be compared with greater than or less than. Given $time_1 = new DateTime('2016-02-24 15:22:01'); $time_2 = new DateTime('2016-01-30 10:41:29'); then the comparison time_1<time_2 is valid and will evaluate to false. Comparisons like this can't be done for objects we create from our own classes. Given an object, is it possible to dete
某些PHP对象（如DateTime的实例）可以比较大于或小于。 特定 $time_1 = new DateTime('2016-02-24 15:22:01'); $time_2 = new DateTime('2016-01-30 10:41:29'); 那么比较时间time_1<time_2是有效的并且将评估为假。 像这样的比较不能为我们从我们自己的类创建的对象完成。 给定一个对象，是否有可能确定它是否可以与大于或小于符号进行比较？ 编辑： 我想用某种方式来测试一个对象是来自一个重载了比较操作符的类
I am new to php and have been trying with no success to get this comparison working: I have a variable 'productCode' that might hold Case 1: initially a value of 'Choose'. Case 2: Later the variable can take a string (with only numbers in it) like 102,103 I need to know what is in the variable productCode? Is it still 'Choose' or '102' (like string with on
我是新来的PHP，并一直试图没有成功得到这个比较工作： 我有一个可变的'productCode'可能 案例1：最初的值为“选择”。 情况2：稍后变量可以采用一个字符串（只有数字），如102,103 我需要知道变量productCode中的内容是什么？ 它仍然是'选择'或'102'（就像只有数字的字符串） 我应该使用哪种比较运算符？ 它具有“选择”的价值吗？ 它应该是 如果productCode设置为“选择”，则返回true 如
This question already has an answer here: Why does (0 == 'Hello') return true in PHP? 5 answers Look at the details here: a string' == 0 also evaluates to true because any string is converted into an integer when compared with an integer. If PHP can't properly convert the string then it is evaluated as 0. So 0 is equal to 0, which equates as true. Also, in the official P
这个问题在这里已经有了答案： 为什么（0 =='Hello'）在PHP中返回true？ 5个答案 看看这里的细节： 一个字符串'== 0也会计算为真，因为与整数相比，任何字符串都转换为整数。 如果PHP无法正确转换字符串，那么它将被评估为0.所以0等于0，这等同于true。 另外，在官方的PHP文档中： 要明确地将值转换为整数，请使用（int）或（integer）强制转换。 但是，在大多数情况下，不需要强制转换，因为如果运算
I want to make a simple algorithm in PHP that has as scope to generate automatically group of numbers between a range. Let me be more clear to you. I have a price filter section for an e-shop collection page. What I do is I'm grabbing the minimum and the maximum price from the database of products, then I would like to create groups of those numbers . Let's suppose that the minimum
我想在PHP中创建一个简单的算法，它可以自动生成范围之间的数字组 。 让我对你更加清楚。 我有一个电子商店收集页面的价格过滤器部分。 我所做的是我从产品数据库中获取最低和最高价格，然后我想创建这些数字的组 。 假设产品的最低价格是50美元， 最高价格是300美元。 我想要做的是这样的事情： 选择价格范围： [复选框在这里] 50 - 100 [复选框] 101 - 150 [复选框在这里] 151 - 200 [复选框在这里] 20
I have a php booking form which checks to make sure that information has been entered in the boxes before its submitted: I use the following to check to make sure group has a value in it. if(!isset($_POST['group']) || trim($_POST['group']) == '') { $error.= "Group Size is required<br/>"; } How can I use an IF statement too check that the value in group is greater than 39 but less th
我有一个php预订表单，它会在提交之前检查以确保信息已输入到框中： 我使用以下检查来确保组中有一个值。 if(!isset($_POST['group']) || trim($_POST['group']) == '') { $error.= "Group Size is required<br/>"; } 我怎样才能使用IF语句来检查组中的值是否大于39但小于400？ 做就是了if(strlen(trim($_POST['code'])) >= 39 && strlen(trim($_POST['code'])) < 400) if(!empty($_POST['group'])
I have a very simple statement that checks whether a value is less than the other, but it does not work, anyone who can check it quickly? Have seen me completely blind to this. $balance = $wallet->balance(); //3000 $loan = $wallet->loan(); // 5000 if (!$balance < $loan) { //Should be pretty straight forward... $wallet->updateBalance(Session::get('user'),$balance - 1000); $wa
我有一个非常简单的声明，检查一个值是否小于另一个，但它不起作用，任何人都可以快速检查它？ 已经看到我对此完全失明。 $balance = $wallet->balance(); //3000 $loan = $wallet->loan(); // 5000 if (!$balance < $loan) { //Should be pretty straight forward... $wallet->updateBalance(Session::get('user'),$balance - 1000); $wallet->updateLoan(Session::get('user'),$loan - 1000); Red
i am using the php to get all the values from textbox, inside a loop i am getting the values. inside a loop i also have the insert statement and the count. The flow is: i will select the value from drop-down list, when i select the number from the drop down list, the corresponding number of text-boxes will be created. for ex:- i have selected the number 3 from drop-down list. so it will cr
我正在使用PHP来获取文本框中的所有值，在循环内获取值。 在一个循环内我也有插入语句和计数。 流程是：我将从下拉列表中选择数值，当我从下拉列表中选择数字时，将创建相应数量的文本框。 例如： - 我从下拉列表中选择了数字3。 所以它会创建3个文本框。 现在我将数据输入到这3个文本框中，然后单击提交。 当我点击提交只有最后一个文本框的值被插入到数据库中。 即当我选择3并输入数据到3文本框时，它只插入第3个
I have a form that calculates a total number using Javascript. The code for the Javascript was taken from here. Once the user submits the form, he is taken to the next page. On the next page, the PHP displays the form total again (this part works), and then, it is supposed to display a different output based on the range of numbers the total is between. For instance, if the total is between
我有一个表格可以使用Javascript计算总数。 Javascript的代码是从这里获取的。 一旦用户提交表格，他将被带到下一页。 在下一页中，PHP再次显示总表格（此部分工作），然后根据总数介于两者之间的数字范围显示不同的输出。 例如，如果总数在1 - 250之间（比如100），那么应该显示X. 如果总数在251 - 500之间（比如350），那么应该显示Y. 目前，无论总数是多少，它都会显示相同的输出。 你可以在这里看到这个表单。
I've been reading the PHP Docs on Type Juggling and Booleans but I still don't understand why this comparison evaluates as true. My [incorrect] understanding tells me that in the below if statement, the integer 0 is considered FALSE and "a", being a non-empty string is considered TRUE. Therefore, I expected this comparison to resolve to FALSE == TRUE and ultimately, FALSE. Wh
我一直在阅读类型杂耍和布尔的PHP文档，但我仍然不明白为什么这个比较评估为真。 我的[不正确]理解告诉我，在下面的if语句中，整数0被认为是FALSE，而“a”是非空字符串被认为是TRUE。 因此，我预计这个比较将解析为FALSE == TRUE并最终为FALSE。 我哪部分错了？ <?php if(0 == "a"){ $result = "TRUE"; }else{ $result = "FALSE"; }
How can I get the client IP address using PHP? I want to keep record of the user who logged into my website through his/her IP address. Whatever you do, make sure not to trust data sent from the client. $_SERVER['REMOTE_ADDR'] contains the real IP address of the connecting party. That is the most reliable value you can find. However, they can be behind a proxy server in which case
我如何使用PHP获取客户端IP地址？ 我想保留通过他/她的IP地址登录我的网站的用户的记录。 无论你做什么，都要确保不要信任从客户端发送的数据。 $_SERVER['REMOTE_ADDR']包含连接方的真实IP地址。 这是你可以找到的最可靠的价值。 但是，它们可以位于代理服务器后面，在这种情况下，代理可能已经设置了$_SERVER['HTTP_X_FORWARDED_FOR'] ，但这个值很容易被欺骗。 例如，它可以由没有代理的人设置，或