what variable in php

Each variable in PHP has a scope for it, which is an area in which you can access a variable (and thus access its value). For starters, variables are scoped to the page where they reside. Therefore, if you define a $var, the rest of the page can

Http://blog.csdn.net/hguisu/article/details/7376705 As mentioned in the previous PHP efficient writing, do not copy variables, especially arrays, whenever possible. In general, the memory usage of PHP arrays is only 1/10. That is to say, an array of

What is the difference between single and double quotes in PHP? 1. As can be seen, the double-quote variable is parsed and output, and the single-quote variable is not resolved. 2. The resolution of single quotation marks is faster than double

PHP's global variables are a little bit different from the C language. In the C language, global variables are active in functions unless they are shrouded by local variables. This may cause some problems, and some people may inadvertently change a

The variables defined by global are global variables, so to speak, if a variable in a function is not a variable in PHP with the same name as the outside of the function, if we use global to define the same variable name in the function, then they

PHP image, file bulk upload code Whether it is a file or a picture batch upload our first is to do in HTML name=userfile[] This array variable, in PHP accept we do for ($_i=0; $_i Example The code is as follows

accessing properties and Methods A property of an object instance is a variable, just like any other variable in PHP. However, you must refer to them using the-I operator. You do not need to use the dollar symbol $ before the property. can be

Data type, numeric type. Data type, numeric data type PHP has three data types: scalar data type, composite data type, special data type PHP weak data type language, a data type in php, numeric type Data type PHP has three data types: scalar data

The thinkphp website recently found a problem, that is, after ajaxpostget was sent to the php background method, it was impossible to debug the thinkphp website recently, after ajax post/get is sent to the php background method, it cannot be

1. There is no global static variable in PHP Done before. NET development, you can use the following methods to cache some data: View Plaincopy to Clipboardprint? PGP is an interpreted language, although there are static

PHP knowledge points and summary, PHP knowledge points SummaryPHP: Hypertext PreprocessorPHP is a server-side scripting language;The PHP script is executed on the server;Bytes --------------------------------------------------------------------------

Generally, you do not need to change the PHP settings. it usually works well according to the default configuration. However, developers who are PHP designers consider that users may occasionally need to adjust some features of the PHP language for

What is a global variable? A global variable, also known as an external variable, is defined outside the function and is scoped to the end of the program file, starting at the definition of the variable. Unlike other programming languages, global

PHP is a weak type. when using PHP, you do not need to define the type of a variable. you can use it to define the type of a variable. In PHP, variable types are determined by the values assigned to them. If the value assigned is an integer PHP is a

A global variable in PHP must be declared as global when used in a function (the keyword Global is defined in a function to be useful). The role of global is to define globals, but this global variable is not applied to the entire site, but to the

Php is used to obtain the name of a variable. php is used to obtain the variable name. Php obtains the name of a variable. in php, all the variables are stored in the HastTable structure of the symbol table, the scope of a symbol is related to the

Front End Group members: Let's put down our hands and have new needs. The large counter on the homepage of our website is the one that counts the download amount of user software. The product manager looked at it and felt it had to add special

I want to write the form content submitted in php to different files. I am still working on that message board. I want to save different messages to different texts. & nbsp; however, after the submitted form is submitted, a PHP file will be executed

This article we mainly share with you the PHP bottom operating mechanism of the detailed, first we will share with you PHP design concept and features, PHP four layer system, etc., hope to help everyone. 1. PHP Design concept and Features

The day before yesterday to interview a 17k salary programmer: Project experience is quite rich, work 10 years, project experience for several years. Let me ask you a few questions: I can't believe it. Do you think it's hard? Can't Baidu Oh. 1. What