Summary: in this tutorial, you’ll learn about the PHP Boolean data type and the boolean values. Introduction to PHP Boolean. A boolean value represents a truth value. In other words, a boolean value can be either true or false. PHP uses the bool type to represent boolean values. To represent boolean literals, you can use the true and false ...文章浏览阅读8.8w次，点赞127次，收藏726次。七种寻址方式(立即寻址、寄存器寻址)一、立即寻址方式操作数作为指令的一部分而直接写在指令中，这种操作数称为立即数，这种寻址方式也就称为立即数寻址方式。立即数可以是8位、16位或32位，该 ...PHP Conditional Statements. Very often when you write code, you want to perform different actions for different conditions. You can use conditional statements in your code to do this. In PHP we have the following conditional statements: if statement - executes some code if one condition is true Arrays. An array in PHP is actually an ordered map. A map is a type that associates values to keys.This type is optimized for several different uses; it can be treated as an array, list (vector), hash table (an implementation of a map), dictionary, collection, stack, queue, and probably more. PHP Conditional Statements. Very often when you write code, you want to perform different actions for different conditions. You can use conditional statements in your code to do this. In PHP we have the following conditional statements: if statement - executes some code if one condition is true You can use strpos () or stripos () to check if the string contain the given needle. It will return the position where it was found, otherwise will return FALSE. Use the operators === or `!== to differ FALSE from 0 in PHP. Share.Arrays. An array in PHP is actually an ordered map. A map is a type that associates values to keys.This type is optimized for several different uses; it can be treated as an array, list (vector), hash table (an implementation of a map), dictionary, collection, stack, queue, and probably more. PHP Variables. In PHP, a variable is declared using a $ sign followed by the variable name. Here, some important points to know about variables: As PHP is a loosely typed language, so we do not need to declare the data types of the variables. Sessions Step By Step. Defining session before everything, No output should be before that, NO OUTPUT <?php session_start(); ?> Set your session inside a page and then you have access in that page.Prior to PHP 8.2.0, when var_export() exports objects, the leading backslash is not included in the class name of namespaced classes for maximum compatibility. Note : To be able to evaluate the PHP generated by var_export() , all processed objects must implement the magic __set_state method.Aug 28, 2012 · 5 Answers. You may use the @var tag to document the data type of class variables. The datatype should be a valid PHP type (int, string, bool, etc), a class name for the type of object, or simply "mixed". phpDocumentor will display the optional description unmodified, and defaults to "mixed" if the datatype is not present. Nov 14, 2023 · The simplest form of debugging in PHP involves: Turning on error reporting. Reading the error messages. Tracing where the problem is and fixing it. That’s all. Even if you don’t know how to fix the error, asking around and searching with the error message is better than screaming “not working”. Read on for more debugging tips! TABLE OF CONTENTS Jun 28, 2021 · 在这里，useEffect 里，对于varB我们想使用的不是useEffect调用时的值，而是varB最新的值。但是，useEffect里引用的变量始终是varA改变时的值，varB改变之后 useEffect 里并不知道。 这时候，我们就需要把 varB 也加入依赖数组，varB改变时重新监听。The @var tag defines which type of data is represented by the value of a property. The @var tag MUST contain the name of the element it documents. An exception to this is when property declarations only refer to a single property. In this case the name of the property MAY be omitted. This is used when compound statements are used to define a ... Jul 27, 2023 · python怎么在两个类之间传递变量，###在两个类之间传递变量的方案在Python中，可以通过多种方式在两个类之间传递变量。下面我们将介绍一种常见的方案来解决这个问题，并提供相关的代码示例。####方案概述通常情况下，我们可以通过以下三种 ...Jun 13, 2012 · Whatever is in the variable is converted to a Boolean (the variable itself of course remains intact), and then a NOT operation (!) is done on the resulting Boolean. The conversion will happen because ! is a Logical Operator and only works on Boolean values. When converting to boolean, the following values are considered FALSE: Tip: If the ... Aug 13, 2014 · 弘历指标源码6个（仅提供源码） （一共六个指标，看看有几个可用） {六彩神龙} {input: 变量00(5,1,30),变量01(30,1,100);} A02:=(WINNER ...Nov 27, 2011 · 汇编程序语言设计复习题整理. 汇编复习题整理 1、80X86微型计算机的组织 1-10 写出下列十进制数的十六进制表示。. 18 34 87 255 4095 62472 解：18=12H；34=22H；87=57H； 255=0FFH；4095=0FFFH； 62472=0F408H; 1-12 处理器的主要功能是实现所有指令的执行并处理数据。. 1-14 指出处理 ...Do you want to access PHP variable in JavaScript? Learn from the answers of this question on Stack Overflow, where experts share their solutions and tips on how to use different methods, such as hidden div, form, or dynamic code generation, to achieve this goal.Jun 13, 2012 · Whatever is in the variable is converted to a Boolean (the variable itself of course remains intact), and then a NOT operation (!) is done on the resulting Boolean. The conversion will happen because ! is a Logical Operator and only works on Boolean values. When converting to boolean, the following values are considered FALSE: Tip: If the ... Mar 19, 2013 · An extra advantage of running a cron with lynx is that it is executed with not only the rights, but also the configuration of that website. If the site has a custom php.ini then it will be run with those settings. curl can do that, but curl is part of php, so 700 or not, if some baddie can upload a php file, he has access to curl.Sep 2, 2022 · Java基础（二） 一、变量 为了在Java中存储一个数据，必须将它容纳在一个变量之中(变量是java程序中的基本存储单元)。而数据类型决定了一个变量可以赋给什么值以及对变量进行什么样的操作。我们将 变量类型 变量名 变量值 称之为变量的三要素。 ...Description ¶. var_dump ( mixed $value, mixed ...$values ): void. This function displays structured information about one or more expressions that includes its type and value. …This function doesn't always produce the expected results if you have a needle that isn't UTF-8 but are looking for it in a UTF-8 string. This won't be a concern for most people, but if you are mixing old and new data, especially if reading data from a file, it could be an issue.I created one pod definition for my web server role, that contains both nginx container, and php-fpm container, running together and sharing the code volume. Actually, I don’t need an Nginx container, as the only thing I’m changing in the default image is adding a configuration file for my website, and password protection (for dev purposes).PHP Collective Join the discussion. This question is in a collective: a subcommunity defined by tags with relevant content and experts. Featured on Meta Updates to the Acceptable Use Policy (AUP) – January 2024. Site maintenance - Thursday, February 1, 2024 @ 01:00 UTC ...$ php -e test.php Pass value by parameter Time: 0.20166087150574s Memory: 0 Global var reference Time: 70.613216876984s Memory: 1048576 GLOBALS array reference Time: 0.22573900222778s Memory: 0 Test Code: Description. You may use the @var tag to document the data type of class variables. The datatype should be a valid PHP type (int, string, bool, etc), a class name for the type of object, or simply "mixed". phpDocumentor will display the optional description unmodified, and defaults to "mixed" if the datatype is not present. Mar 3, 2020 · 用牙签在猪皮上扎几下，刷上白醋。. *白醋是脆皮的关键呀，千万不能省略！. 空气炸锅220°C，烤30分钟。. 30分钟后，打开锡纸，再刷一次白醋。. 空气炸锅设定210°C，继续烤10～15分钟。. 烤好的五花肉放厨房纸上吸去油脂。. 切好装盘即可。. 欢迎大 …I created one pod definition for my web server role, that contains both nginx container, and php-fpm container, running together and sharing the code volume. Actually, I don’t need an Nginx container, as the only thing I’m changing in the default image is adding a configuration file for my website, and password protection (for dev purposes).clear concept of variable declaration rules and classification. variable declaration rules: 1.start with dollar sign ($) 2.first letter of variable name comes from a-zA-z_. 3.next letters of variable name comes from a-zA-Z0-9_. 4.no space,no syntex. classification of variables: The dump() Function. The VarDumper component creates a global dump() function that you can use instead of e.g. var_dump.By using it, you'll gain: Per object and resource types specialized view to e.g. filter out Doctrine internals while dumping a single proxy entity, or get more insight on opened files with stream_get_meta_data;; Configurable output …$ php -e test.php Pass value by parameter Time: 0.20166087150574s Memory: 0 Global var reference Time: 70.613216876984s Memory: 1048576 GLOBALS array reference Time: 0.22573900222778s Memory: 0 Test Code: A second look into the PHP specs tells that is_null() checks whether a value is null or not. So, you may pass any VALUE to it, eg. the result of a function. isset() on the other hand is supposed to check for a VARIABLE's existence, which makes it a language construct rather than a function. } Code language: PHP (php) If you place the variadic parameter before a regular one, you’ll get an error: Fatal error: Only the last parameter can be variadic in... Code language: PHP (php) And a function only has one variadic parameter. Note that you can use the array_sum() to calculate the sum of all elements of an array.How can I mark option element as selected with PHP? Thanks! php; html; Share. Improve this question. Follow edited Jul 25, 2017 at 18:57. akrisanov. asked Sep 19, 2010 at 19:54. akrisanov akrisanov. 3,212 6 6 gold badges 34 34 silver badges 56 56 bronze badges. Add a …Learn about the different data types in PHP, such as strings, numbers, booleans, arrays, objects, and more. This tutorial explains how to use and manipulate data types with examples and exercises. You can also find related functions, such as floatval(), to convert variables to floats. Sep 2, 2022 · Java基础（二） 一、变量 为了在Java中存储一个数据，必须将它容纳在一个变量之中(变量是java程序中的基本存储单元)。而数据类型决定了一个变量可以赋给什么值以及对变量进行什么样的操作。我们将 变量类型 变量名 变量值 称之为变量的三要素。 ...Jul 30, 2009 · It's for declaring class member variables in PHP4, and is no longer needed. It will work in PHP5, but will raise an E_STRICT warning in PHP from version 5.0.0 up to version 5.1.2, as of when it was deprecated. One of the key-points of PHP OOP that is often mentioned is that "objects are passed by references by default". This is not completely true. This section rectifies that general thought using some examples. A PHP reference is an alias, which allows two different variables to write to the same value. There are two methods to INSERT data into MySQL database – the PHP MySQLi method and the PHP Data Object (PDO) method. Inserting Data Using MySQLi Method. First, establish a connection to a database. When connected, proceed with the INSERT MySQL query. Here is a full PHP code example with the basic connection and …The <var> tag is used to defines a variable in programming or in a mathematical expression. The content inside is typically displayed in italic. Tip: This tag is not deprecated. However, it is possible to achieve richer effect by using CSS. Also look at: Jan 12, 2022 · 5.7参数的校验. 文章浏览阅读808次。. 5.FastAPI显式声明参数FastAPI允许显式声明参数属于查询参数、路径参数或者请求体；同时还可以为参数声明默认值、额外的信息及校验；也允许显式声明可选参数；5.1可选参数可选参数的显式声明使用 typing. Optional来声明；代码 ...This function doesn't always produce the expected results if you have a needle that isn't UTF-8 but are looking for it in a UTF-8 string. This won't be a concern for most people, but if you are mixing old and new data, especially if reading data from a file, it could be an issue.If you want to learn how to embed php script in javascript, you can find the answer in this Stack Overflow question. You will see how to use the echo function, the json_encode function, and the script tag to achieve this. You will also see some examples and explanations from other users who have faced the same problem.Mar 3, 2020 · 用牙签在猪皮上扎几下，刷上白醋。. *白醋是脆皮的关键呀，千万不能省略！. 空气炸锅220°C，烤30分钟。. 30分钟后，打开锡纸，再刷一次白醋。. 空气炸锅设定210°C，继续烤10～15分钟。. 烤好的五花肉放厨房纸上吸去油脂。. 切好装盘即可。. 欢迎大 …Mar 17, 2021 · 文章标签： php invoke 反射. PHP5 开始提供了完整的反射API。. 有反射类 (ReflectionClass)和反射函数 (ReflectionFunction)等，功能大同小异，这里主要以ReflectionClass为列说明。. 什么是反射. 他是指PHP在运行状态中，动态的获取类、方法、属性、参数、注释等信息和动态调用 ...Nov 11, 2018 · 1.立即寻址方式 MOV AH, 80H（直接给寄存器赋值）2. 寄存器寻址方式（源或者目的有一个是寄存器）2.1) 源操作数是寄存器寻址方式如：ADD VARD, EAX ADD VARW, AX MOV VARB, BH等。. 其中：VARD、VARW和VARB是双字，字和字节类型的内存变量。. 2.2) 目的操作数是寄存器寻址方式如 ...To configure general request-filter options by using the UI. Open IIS Manager and select the level for which you want to configure request filter. In Features View, double-click Request Filtering. In the Actions pane, click Edit Feature Settings. In the Edit Request Filtering Settings dialog, edit the settings as desired, and then click OK.Jun 20, 2011 · Using is_numeric() for checking if a variable is an integer is a bad idea. This function will return TRUE for 3.14 for example. It's not the expected behavior. To do this correctly, you can use one of these options: The variable you want to export. return If used and set to true, var_export () will return the variable representation instead of outputting it. Return Values ¶ Returns the variable …You can use our writing checker by following the steps below: Step 1: Upload the text file from your device or paste the text into the given box. Step 2: Select a language and dialect on which your uploaded text is based. Step 3: Complete the Google Captcha (For Security Concerns). Step 4: Click the Check Grammar button.Read. Courses. The var keyword in PHP is used to declare a property or variable of class which is public by default. The var keyword is same as public when …Jan 12, 2022 · 5.7参数的校验. 文章浏览阅读808次。. 5.FastAPI显式声明参数FastAPI允许显式声明参数属于查询参数、路径参数或者请求体；同时还可以为参数声明默认值、额外的信息及校验；也允许显式声明可选参数；5.1可选参数可选参数的显式声明使用 typing. Optional来声明；代码 ...A function in PHP need only return a value type that evaluates to false for something like this to work. The OR operator in PHP will not evaluated its second argument IF the first argument is true (as regardless of the second argument's output, the or statement will still pass) and lines like this will attempt to call a query and assign the ... Dec 30, 2020 · amp mysq 深入浅出php_PHP & MySQL Web数据库应用开发指南读后感1000字. 《PHP & MySQL Web数据库应用开发指南》是一本由 [澳] Hugh E.Williams / David Lane著作，东南大学出版社出版的平装图书，本书定价：78.00元，页数：782，特精心从网络上整理的一些读者的读后感，希望对 ...Dec 9, 2021 · 2)选择均线上尽量呈多头排列的，刚刚突破平台整理的或者即将突破平台整理的，突破筹码单峰密集的，刚刚站上60日均线的，超跌反弹，k线形态组合好的，macd金叉等形态票! 3)尽量选近期热点板块，或者昨天晚上有利好新闻的板块和个股!【如果昨天没有看 …Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more. Jun 20, 2011 · Using is_numeric() for checking if a variable is an integer is a bad idea. This function will return TRUE for 3.14 for example. It's not the expected behavior. To do this correctly, you can use one of these options: Complete PHP Filter Reference. For a complete reference of all filter functions, go to our complete PHP Filter Reference. Check each filter to see what options and flags are available. The reference contains a brief description, and examples of use, for each function! In this tutorial, you'll learn how to use the PHP empty() construct to check if a variable is empty.The <var> HTML element represents the name of a variable in a mathematical expression or a programming context. It's typically presented using an italicized version of the current typeface, although that behavior is browser-dependent.Step 1 — Building the Backend with PHP. For the purposes of this tutorial, the backend will be written in PHP. First, open a terminal window and create a new project directory: mkdir jquery-form-validation. Navigate to this new project directory: cd jquery-form-validation. Then, use your code editor to create a new process.php file:Dec 30, 2020 · amp mysq 深入浅出php_PHP & MySQL Web数据库应用开发指南读后感1000字. 《PHP & MySQL Web数据库应用开发指南》是一本由 [澳] Hugh E.Williams / David Lane著作，东南大学出版社出版的平装图书，本书定价：78.00元，页数：782，特精心从网络上整理的一些读者的读后感，希望对 ...@KyleAdams It makes perfect sense that they cannot be serialised, because you cannot serialise code (a closure), only values. A closure declared as function() { /* do stuff */ } is converted internally to an instance of the Closure class, which is in many ways a standard object, the code in the body of the function becomes an internal "method". Just like any …PHP Tutorial PHP, an acronym for Hypertext Preprocessor, is a widely-used open source general-purpose scripting language. It is a cross-platform, HTML embedded server-side scripting language and is especially suited for web development. Go to …PHP uses a table of sorts that maps variable names to the data that variable refers to in memory. The $_POST superglobal will actually be the first instance of that data in the …Syntax of declaring a variable in PHP is given below: $variablename=value; Rules for declaring PHP variable: A variable must start with a dollar ($) sign, followed by the …The @var tag defines which type of data is represented by the value of a property. The @var tag MUST contain the name of the element it documents. An exception to this is when property declarations only refer to a single property. In this case the name of the property MAY be omitted. This is used when compound statements are used to define a ... May 6, 2013 · From the PHP docs: "Curly braces may also be used, to clearly delimit the property name. They are most useful when accessing values within a property that contains an array, when the property name is made of multiple parts, or when the property name contains characters that are not otherwise valid (e.g. from json_decode() or SimpleXML)." To check for valid ipv4 or ipv6 addresses use the following code as value in your validation rules array: // form fieldname to be checked => 'rules ip-separated' 'field1' => 'required|ipv4', // checks for an ipv4 address + field is required 'field2' => 'nullable|ipv4', // checks for an ipv6 address + an empty string is valid as well. Share.2 Answers. Sorted by: 48. This is a variable variable, such that you will end up with $this-> {value-of-$val}. See: …This could be worth a pull request at php's GitHub project page. May be needed often to just validate a json string. I usually use for this purpose instead of filter_var filter_input. But in your meaning it's the same. Both functions should have …EnglishClub: Learn English: Grammar: Verbs: Tense: 12 Basic Tenses The 12 Basic English Tenses. The English Tense System. The links below are to lessons for each of the 12 basic English tenses*.For each tense we look at: Structure: How do we make the tense? Use: When and why do we use the tense? Some lessons look at additional matters, and most …5 days ago · Create your own server using Python, PHP, React.js, Node.js, Java, C#, etc. How To's. Large collection of code snippets for HTML, CSS and JavaScript. CSS Framework. Build fast and responsive sites using our free W3.CSS framework Browser Statistics. Read long term trends of browser usage ...Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand ; Advertising Reach developers & technologists worldwide; Labs The future of collective knowledge sharing; About the companyPHP uses a table of sorts that maps variable names to the data that variable refers to in memory. The $_POST superglobal will actually be the first instance of that data in the …In fact, all Blade templates are compiled into plain PHP code and cached until they are modified, meaning Blade adds essentially zero overhead to your application. Blade template files use the .blade.php file extension and are typically stored in the resources/views directory. Jun 13, 2012 · Whatever is in the variable is converted to a Boolean (the variable itself of course remains intact), and then a NOT operation (!) is done on the resulting Boolean. The conversion will happen because ! is a Logical Operator and only works on Boolean values. When converting to boolean, the following values are considered FALSE: Tip: If the ... The W3Schools online code editor allows you to edit code and view the result in your browser May 26, 2021 · The var keyword in PHP is used to declare a property or variable of class which is public by default. The var keyword is same as public when declaring variables or property of a class. Note: The var keyword was deprecated from version 5.0.0 up to version 5.1.2. Since PHP 5.1.3 it has been added again. 0. Use serialize () on the variable, then save the string to a file. later you will be able to read the serialed var from the file and rebuilt the original var (wether it was a string or an array or an object) Share. Improve this answer.PHP provides a list of sanitizing filters that you can use to sanitize input effectively. The following functions use these filters to sanitize the input: filter_input () filter_var () filter_input_array () filter_var_array () In this tutorial, we’ll create a reusable sanitize () function that sanitizes the inputs in a more expressive way.200 common phrasal verbs, with. - meaning. - example sentence. ask somebody out. invite on a date. Brian asked Judy out to dinner and a movie. ask around. ask many people the same question. I asked around but …Mar 24, 2021 · 文章浏览阅读64次。__invoke执行“ uncurrying”，这与“ currying”相反。以下内容适用于PHP的所有“可调用对象”(命名函数，闭包，方法，__invoke等)，因此为简单起见，我们忽略它们之间的区别，而只关注闭包。如果我们想接受多个参数，PHP允许我们使用3种不同的API来实现。Do you want to access PHP variable in JavaScript? Learn from the answers of this question on Stack Overflow, where experts share their solutions and tips on how to use different methods, such as hidden div, form, or dynamic code generation, to achieve this goal.echo 'After calling the die function'; Code language: PHP (php) Therefore, you didn’t see the message in the output. To make the code reusable, you can wrap the code snippet above in a function e.g., dd() . worth reading for people learning about php and programming: (adding extras <?php ?> to get highlighted code) about the following example in this page manual: Example#1 Logical operators illustrated http: // ⓔⓧⓐⓜⓟⓛⓔ.ⓒⓞⓜ = example.com \n\nList:\n① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ⑫ ⑬ ⑭ ⑮ ⑯ ⑰ ⑱ ⑲ ⑳ ⑴ ⑵ ⑶ ⑷ ⑸ ⑹ ⑺ ⑻ ⑼ ⑽ ⑾ ⑿ ⒀ ⒁ ⒂ ⒃ ⒄ ⒅ ⒆ ⒇ ⒈ ⒉ ⒊ ⒋ ⒌ ⒍ ⒎ ⒏ ⒐ ⒑ ⒒ ⒓ ⒔ ⒕ ⒖ ⒗ ⒘ ⒙ ⒚ ⒛ ...
Summary: in this tutorial, you will learn how to use PHP variables to store data in programs.. Define a variable. A variable stores a value of any type, e.g., a string, a number, an array, or an object. A variable has a name and is associated with a value. To define a variable, you use the following syntax:. Ku k state game
The technical limitations with using PUT and DELETE requests does not lie with PHP or Apache2; it is instead on the burden of the browser to sent those types of requests. Simply putting <form action="" method="PUT"> will not work because there are no browsers that support that method (and they would simply default to GET, treating PUT …17 years ago. get_cfg_var returns the value from php.ini directly,while the ini_get returns the runtime config value. I have tried it on PHP 5.1.6. [EDIT by danbrown AT php DOT net: The author of this note means that ini_get () will return values set by ini_set (), .htaccess, a local php.ini file, and other functions at runtime.Output: It will open your form like this, asked information will be passed to the PHP page linked with the form (action=”form2.php”) with the use of the POST method. In the next step, submitted information will be stored in the session array. Code 2: Repeat the process of saving the file as explained above. Use the file name ‘form2.php’. When you …PHP supports the concept of variable functions. This means that if a variable name has parentheses appended to it, PHP will look for a function with the same name as whatever the variable evaluates to, and will attempt to execute it. Among other things, this can be used to implement callbacks, function tables, and so forth. The @var tag defines which type of data is represented by the value of a property. The @var tag MUST contain the name of the element it documents. An exception to this is when property declarations only refer to a single property. In this case the name of the property MAY be omitted. This is used when compound statements are used to define a ... 5 Answers. You may use the @var tag to document the data type of class variables. The datatype should be a valid PHP type (int, string, bool, etc), a class name …Apr 9, 2021 · union的优势会对数据集进行：. 1.排序. 2.去重. 但是如果有完全相同的数据情况下就会漏掉，我之前觉得不会有两笔交易的时间会完全相同，但是看来完全有可能存在的。. 所以分组之后的数据字段一般比较少，重复的概率也会增大，在没有排序的情况下，union一 …Feb 2, 2023 · php invoke方法是PHP5.3新增的一个魔术方法，该方法可以在创建实例后，直接调用对象，也就是通过函数的方式来使用对象，并且invoke方法也可以带参数。 PHP 5.3新增了一个叫做__ invoke 的魔术方法，这样在创建实例后，可以直接调用对象。Mar 17, 2021 · 文章标签： php invoke 反射. PHP5 开始提供了完整的反射API。. 有反射类 (ReflectionClass)和反射函数 (ReflectionFunction)等，功能大同小异，这里主要以ReflectionClass为列说明。. 什么是反射. 他是指PHP在运行状态中，动态的获取类、方法、属性、参数、注释等信息和动态调用 ...http: // ⓔⓧⓐⓜⓟⓛⓔ.ⓒⓞⓜ = example.com \n\nList:\n① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ⑫ ⑬ ⑭ ⑮ ⑯ ⑰ ⑱ ⑲ ⑳ ⑴ ⑵ ⑶ ⑷ ⑸ ⑹ ⑺ ⑻ ⑼ ⑽ ⑾ ⑿ ⒀ ⒁ ⒂ ⒃ ⒄ ⒅ ⒆ ⒇ ⒈ ⒉ ⒊ ⒋ ⒌ ⒍ ⒎ ⒏ ⒐ ⒑ ⒒ ⒓ ⒔ ⒕ ⒖ ⒗ ⒘ ⒙ ⒚ ⒛ ...A second look into the PHP specs tells that is_null() checks whether a value is null or not. So, you may pass any VALUE to it, eg. the result of a function. isset() on the other hand is supposed to check for a VARIABLE's existence, which makes it a language construct rather than a function. .
