meaning of opcode

What is NOPNOP? It is a special opcode that indicates an empty operation. It exists in many places, and the meaning of NOP in the Assembly is the same. The null operation in the machine instruction is usually used to align the memory address, to

In all programming languages, I think strings should be the most common means of expression on Earth.In the Java world, string occurs as a class, and the core of a field is a char array, which is internally exported by maintaining an immutable array

# # 1. Let's start with a php5.3+ grammar sugar, which we usually write about: $a = 0; $b = $a? $a: 1; Syntax sugar can be written like this: $a = 0; $b = $a?: 1; Execution results $b = 1, the latter is more concise, but usually not too much

1. Let's start with a php5.3+ grammar sugar, which we usually write about: Syntax sugar can be written like this: Execution results $b = 1, the latter is more concise, but usually not too much syntax sugar, especially easy to understand confusion,

PHP is an analytic high-level language, in fact, from the point of view of the Zend kernel PHP is a normal C program, it has a main function, we write the PHP code is the input of this program, and then through the kernel processing output, the

I have recently been involved in Python bytecode related work and would like to share some of this experience with you. To be more precise, I am participating in the work of the 2.6 to 2.7 version of the CPython interpreter byte code. Python is a

This article is based on Zhou Zhiming's "in-depth understanding of Java virtual machines"The instructions for a Java virtual machine consist of a byte-length opcode that represents the meaning of a particular operation (Opcode) and 0 to several

What's the difference between APC and ZendopcacheHttp://www.laruence.com/2013/03/18/2846.htmlClick ( here ) to collapse or open In the past, many people would have chosen to use APC, In addition to the opcode cache, APC provides a set of

optimizer+ is the first and fastest opcode caching tool for Zend developed closed-source, but free-to-use PHP optimization acceleration components. Now, Zend technology company will optimizer+ under PHP License open source becomes Zend Opcache.

Summarize:1. Long connection mechanism--distinguish Websocket,http2,sse:HTTP/2 introduced server Push technology to allow the server to proactively send data to the client cache. However, it does not allow data to be sent directly to the client