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The use and difference between intval() and (int) conversion under PHP

Wondering what the difference is between using intval() and (int) conversion? Or what are the differences between the two, including functions and definitions. Or related to frequency of use, efficiency, etc.

Dec 13, 2016 pm 01:03 PM

Detailed explanation of PHP page encoding declaration method (header or meta)

The difference between PHP page encoding declaration and using header or meta to implement PHP page encoding

Dec 13, 2016 pm 12:00 PM

php coding

linux command: top command

The top command is a commonly used performance analysis tool under Linux. It can display the resource usage of each process in the system in real time, similar to the Windows Task Manager. The following describes how to use it in detail. top is a dynamic display process, that is, the current status can be continuously refreshed through the user's keystrokes. If this command is executed in the foreground, it will occupy the foreground exclusively until the user terminates the program. To be more precise, the top command provides real-time control of the system Processor status monitoring. It will display a list of the most CPU "sensitive" tasks in the system. This command can sort tasks by CPU usage, memory usage and execution time; and many features of this command can be accessed through interactive commands or Make settings in the personal customization file.

Dec 13, 2016 am 11:59 AM

Analyze the implementation principles of session in PHP and issues that should be paid attention to when applying large websites

This article is a detailed analysis and introduction to the implementation principle of session in PHP and the issues that should be paid attention to in large website applications. Friends who need it can refer to it.

Dec 13, 2016 am 11:58 AM

session

rails render partial parameter variable description

Dec 13, 2016 am 11:54 AM

Linux reboot command

The Linux reboot command is used to restart the computer. If the runlevel of the system is 0 or 6, reboot, otherwise use the shutdown command (plus the -r parameter) to replace it.

Dec 13, 2016 am 11:43 AM

Linux command: reboot command

This command is used to restart the Linux system. Equivalent to the restart command in Windows systems.

Dec 13, 2016 am 11:41 AM

reboot command

Linux C Programming - Pipes

In Linux, a pipe is also a kind of file, but it is special. We can use the pipe function to create a pipe, and its prototype is declared as follows:

Dec 13, 2016 am 11:37 AM

Linux pipe function

pipe (create pipe): 1) Header file #include<unistd.h> 2) Define function: int pipe(int filedes[2]); 3) Function description: pipe() will create a pipe and change the file descriptor from The parameter filedes array is returned. filedes[0] is the reading end of the pipe, and filedes[1] is the writing end of the pipe. 4) Return value: If successful, return zero, otherwise return -1, and the cause of the error is stored in errno. Error code: E

Dec 13, 2016 am 11:34 AM

pipe() function in linux programming

A pipe is a mechanism that connects the standard input and standard output between two processes, thereby providing a method for communication between multiple processes. When a process creates a pipe, it needs to provide two file descriptors each time. to operate the pipeline. One of them writes to the pipe and the other reads from the pipe. The reading and writing of pipes are consistent with the general IO system functions. Use the write() function to write data and read() to read data.

Dec 13, 2016 am 11:31 AM

linux pipe

Detailed explanation of Websocket protocol and simple example code

This article mainly introduces the relevant information of the Websocket protocol in detail and simple example code. Here is a detailed introduction to the websocket protocol and a simple example code. Friends in need can refer to it.

Dec 13, 2016 am 10:59 AM

websocket

linux yum command

yum (Yellow dog Updater, Modified) is a Shell front-end package manager in Fedora, RedHat and SUSE. Based on RPM package management, it can automatically download and install RPM packages from designated servers, automatically handle dependencies, and install all dependent software packages at once, without the need to download and install them again and again. yum provides commands to find, install, and delete a certain, a group, or even all software packages, and the commands are concise and easy to remember.

Dec 13, 2016 am 10:53 AM

Configuration and use of CentOS yum source

yum, the abbreviation of Yellow dog Updater, Modified, is a software package manager developed by Duke University to improve the installability of RPM software packages. It was originally developed by Terra Soft, the developer of the yellow dog distribution, and was written in python. At that time, it was also called yup (yellow dog updater). It was later improved by the Linux@Duke development team of Duke University, hence the name. The purpose of yum is to automatically upgrade, install/remove rpm packages, collect information about rpm packages, check dependencies and automatically prompt users to solve them. The key to yum is to have reliable r

Dec 13, 2016 am 10:50 AM

yum command

The yum command is an rpm-based software package manager in Fedora, RedHat and SUSE. It allows system administrators to interactively and automatically manage RPM packages in a more detailed manner. It can automatically download and install RPM packages from a designated server. It can automatically Handle dependencies and install all dependent software packages at once, eliminating the need to download and install them again and again.

Dec 13, 2016 am 10:43 AM