Course Intermediate  11329

Course Introduction："Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.

Course Advanced  17632

Course Introduction："Shangxuetang MySQL Video Tutorial" introduces you to the process from installing to using the MySQL database, and introduces the specific operations of each link in detail.

Course Advanced  11344

Course Introduction："Brothers Band Front-end Example Display Video Tutorial" introduces examples of HTML5 and CSS3 technologies to everyone, so that everyone can become more proficient in using HTML5 and CSS3.

Course Introduction：In PHP programming, we often need to determine whether a variable has been set. This prevents programs from causing errors when using unset variables. In order to achieve this purpose, we usually use the isset() function to judge. The isset() function is used to determine whether a variable has been set and is not null. If the variable has been set and is not null, the function returns true; otherwise it returns false. Here is an example using the isset() function: $var=&q

2023-06-27 comment 0  1140

Course Introduction：How to determine whether a variable has a set function in PHP: You can use the isset() function to determine. The isset() function is used to detect whether a variable has been set and is not NULL. Returns TRUE if the specified variable exists and is not NULL, otherwise returns FALSE.

2020-08-11 comment 0  2380

Course Introduction：PHP function introduction—isset(): Check whether the variable has been set and is not null. In PHP programming, the setting and use of variables is very important. When dealing with large amounts of data and operations, we often need to check whether a variable has been set and is not null. This is where the isset() function in PHP comes in handy. By using the isset() function, we can easily determine whether the variable has been set so that we can handle it accordingly in the program. The usage of isset() function is very

2023-07-24 comment 0  1713

Course Introduction：PHP7 performance optimization tips: How to use the isset function to determine whether a variable has been declared Introduction: In PHP development, we often need to determine whether a variable has been declared. This is particularly important in situations such as when using an undeclared variable that produces an error. In PHP7, for performance optimization reasons, we should try to use the isset function to determine whether a variable has been declared, instead of directly using functions such as empty and is_null. Why use isset: In PHP

2023-08-01 comment 0  734

Course Introduction：Use Java's Character.isDefined() function to determine whether a character is a defined character. In Java programming, sometimes you need to determine whether a character is a defined character. For convenience, Java provides the isDefined() function of the Character class, which can help us quickly determine whether a character is a defined character. This article explains how to use this function and provides some code examples. Character class represents a single character in Java

2023-07-25 comment 0  1044