Summary of new features in php7
This article brings you a summary of the new features in php7. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
It has been almost three years since PHP7 was released, and it has now developed to version PHP7.2.9. Its release has brought great performance improvements to PHP, which is mainly due to PHP's deep optimization of the Zend engine and also reduces PHP's resource usage on the system.
The main changes are as follows:
Abstract syntax tree
In previous versions of PHP, PHP code The ZendVM
instruction is directly generated during the syntax parsing stage, that is, the opline
instruction is directly generated in zend_language_parser.y
, which couples the compiler and the executor. .
An abstract syntax tree is added to PHP7. First, the PHP code is parsed to generate an abstract syntax tree, and then the abstract syntax tree is compiled into ZendVM
instructions. The addition of the abstract syntax tree makes the PHP compiler and executor well isolated. The compiler does not need to care about the generation rules of instructions. Then the executor compiles the abstract syntax tree into corresponding instructions according to its own rules. The executor also does not You need to care about what the syntax rules of this instruction look like.
Native TLS
Native TLS
(thread local storage) is used in PHP7 to save the thread's resource pool, simple To put it simply, __thread
is used to identify a global variable, so that this global variable is exclusive to the thread, and modifications by different threads will not affect each other.
Specify function parameters and return value types
In PHP7, you can specify the types of function parameters and return values.
Changes in zval structure
PHP7 transfers the reference count to a specific value
, which is more reasonable. In addition, the size of the zval
structure has also been reduced from 24byte to 16byte. This is an optimization point where PHP7 can reduce system resource usage.
Exception handling
Many operations in PHP5.x will directly throw error errors. In PHP7, most errors are changed to exception throws. In this way, it can be captured through try catch
.
Changes in HashTable
There are very big changes in HashTable
in PHP7, the HashTable
structure The size is reduced from 72byte to 56byte. At the same time, the array element Bucket
structure is also reduced from 72byte to 32byte.
Executor
no longer adopts the method of passing parameters in PHP7, but execute_data
, opline
Storage is performed through registers, which avoids frequent stack operations caused by passing parameters. At the same time, registers are accessed faster than memory.
New parameter parsing method
PHP5.x parses function parameters through zend_parse_parameters()
, PHP7 provides Another method retains the original method, but the new parsing method is faster.
Related recommendations:
PHP7 New Features Introduction
PHP7 New Features Introduction
The above is the detailed content of Summary of new features in php7. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
