Home Backend Development PHP Tutorial Analysis of common string output methods in PHP (echo, print, printf and sprintf)

Analysis of common string output methods in PHP (echo, print, printf and sprintf)

Jan 21, 2017 pm 01:23 PM

本文讲述了php常用字符串输出方法。分享给大家共大家参考,具体如下:

1. echo用法:可用echo 直接输出,也可以用echo()输出,无返回值

$string="<b>加粗显示文字</b>";
echo $string;
//echo "<br/>";
//echo($string);//效果同上
echo "<br/>";
echo "This ", "is ", " echo test!";//echo输出用逗号隔开的多个字符串
echo "<br/>";
Copy after login

2. print用法:同上echo一样,只是print运行速度比echo慢,且一次只能输出一个字符串,始终返回1

$string="<b>加粗显示文字</b>";
print $string;
//print "<br/>";
//print($string);//效果同上
print "<br/>";
Copy after login

3. printf:格式化输出字符串

/*
%% - 返回一个百分号 %
%b - 二进制数
%c - ASCII 值对应的字符
%d - 包含正负号的十进制数(负数、0、正数)
%e - 使用小写的科学计数法(例如 1.2e+2)
%E - 使用大写的科学计数法(例如 1.2E+2)
%u - 不包含正负号的十进制数(大于等于 0)
%f - 浮点数(本地设置)
%F - 浮点数(非本地设置)
%g - 较短的 %e 和 %f
%G - 较短的 %E 和 %f
%o - 八进制数
%s - 字符串
%x - 十六进制数(小写字母)
%X - 十六进制数(大写字母)
*/
$num=23;
printf("printf输出浮点数:%f",$num);//输出:23.000000
printf("<br/>");
printf("printf输出2位小数浮点数:%1\$.2f <br/>printf输出无小数位:%1\$u",$num);//输出:23.00
printf("<br/>");
Copy after login

4. sprintf:

$name="Tom";
$age=20;
$printstr=sprintf("sprintf输出:他名字叫%s,年龄是%u",$name,$age);
echo $printstr;//输出:他名字叫Tom,年龄是20
Copy after login

希望本文所述对大家php程序设计有所帮助。

更多php常用字符串输出方法分析(echo,print,printf及sprintf) 相关文章请关注PHP中文网!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

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

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Apr 05, 2025 am 12:04 AM

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,

Describe the SOLID principles and how they apply to PHP development. Describe the SOLID principles and how they apply to PHP development. Apr 03, 2025 am 12:04 AM

The application of SOLID principle in PHP development includes: 1. Single responsibility principle (SRP): Each class is responsible for only one function. 2. Open and close principle (OCP): Changes are achieved through extension rather than modification. 3. Lisch's Substitution Principle (LSP): Subclasses can replace base classes without affecting program accuracy. 4. Interface isolation principle (ISP): Use fine-grained interfaces to avoid dependencies and unused methods. 5. Dependency inversion principle (DIP): High and low-level modules rely on abstraction and are implemented through dependency injection.

How to automatically set permissions of unixsocket after system restart? How to automatically set permissions of unixsocket after system restart? Mar 31, 2025 pm 11:54 PM

How to automatically set the permissions of unixsocket after the system restarts. Every time the system restarts, we need to execute the following command to modify the permissions of unixsocket: sudo...

How to debug CLI mode in PHPStorm? How to debug CLI mode in PHPStorm? Apr 01, 2025 pm 02:57 PM

How to debug CLI mode in PHPStorm? When developing with PHPStorm, sometimes we need to debug PHP in command line interface (CLI) mode...

Explain the concept of late static binding in PHP. Explain the concept of late static binding in PHP. Mar 21, 2025 pm 01:33 PM

Article discusses late static binding (LSB) in PHP, introduced in PHP 5.3, allowing runtime resolution of static method calls for more flexible inheritance.Main issue: LSB vs. traditional polymorphism; LSB's practical applications and potential perfo

How to send a POST request containing JSON data using PHP's cURL library? How to send a POST request containing JSON data using PHP's cURL library? Apr 01, 2025 pm 03:12 PM

Sending JSON data using PHP's cURL library In PHP development, it is often necessary to interact with external APIs. One of the common ways is to use cURL library to send POST�...

Explain late static binding in PHP (static::). Explain late static binding in PHP (static::). Apr 03, 2025 am 12:04 AM

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.

See all articles