Table of Contents
回复讨论(解决方案)
Home Backend Development PHP Tutorial 怎么替换一个字符串中间的字符

怎么替换一个字符串中间的字符

Jun 23, 2016 pm 02:12 PM

怎么替换一个字符串中间的字符?
比如: fdsfdsfdsjkww
替换成:f**********w
比如: 扣分金锡民
替换成:扣***民
比如: 扣分金锡民s
替换成:扣****s
比如: tt扣分金锡民s
替换成:t*****s


回复讨论(解决方案)

<?php$str ='tt扣分金锡民s';function hide_repalce($str, $code='utf-8') {	mb_internal_encoding($code);	$len = mb_strlen($str);	return mb_substr($str, 0, 1) . str_repeat('*', $len - 2) . mb_substr($str, $len - 1, 1);}echo hide_repalce($str);
Copy after login
Copy after login
Copy after login

Replace ( string1, start, string2,n,m )

<?php$str ='tt扣分金锡民s';function hide_repalce($str, $code='utf-8') {	mb_internal_encoding($code);	$len = mb_strlen($str);	return mb_substr($str, 0, 1) . str_repeat('*', $len - 2) . mb_substr($str, $len - 1, 1);}echo hide_repalce($str);
Copy after login
Copy after login
Copy after login


有乱码,看到吗?

乱码要看你的编码是什么 设置正确的编码

$string='fdsfdsfdsjkww';
echo substr($string,0,1).'*****'.substr($string,$sLeng-1,1);


<?php$str ='tt扣分金锡民s';function hide_repalce($str, $code='utf-8') {	mb_internal_encoding($code);	$len = mb_strlen($str);	return mb_substr($str, 0, 1) . str_repeat('*', $len - 2) . mb_substr($str, $len - 1, 1);}echo hide_repalce($str);
Copy after login
Copy after login
Copy after login


有乱码,看到吗?

如果是使用utf8-编码,源文件的编码、输出显示的编码都要用utf-8

简单点的

$string='fdsfdsfdsjkww';echo substr_replace($string, str_repeat('*',strlen($string)-2), 1, strlen($string)-2);
Copy after login
Copy after login

注意长度问题,在不同编码下,中文和英文的字节会不一样的,多以长度要计算对了,不然会出现乱码

$string='fdsfdsfdsjkww';echo substr_replace($string, str_repeat('*',strlen($string)-2), 1, strlen($string)-2);
Copy after login
Copy after login

这个相对比较简单

substr_replace ? 替换字符串的子串

string
输入字符串。

replacement
替换字符串。

start
如果 start 为正数,替换将从 string 的 start 位置开始。

如果 start 为负数,替换将从 string 的倒数第 start 个位置开始。

length
如果设定了这个参数并且为正数,表示 string 中被替换的子字符串的长度。如果设定为负数,它表示待替换的子字符串结尾处距离 string 末端的字符个数。如果没有提供此参数,那么它默认为 strlen( string ) (字符串的长度)。当然,如果 length 为 0,那么这个函数的功能为将 replacement 插入到 string 的 start 位置处

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 Article

Roblox: Bubble Gum Simulator Infinity - How To Get And Use Royal Keys
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Nordhold: Fusion System, Explained
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Mandragora: Whispers Of The Witch Tree - How To Unlock The Grappling Hook
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

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)

Hot Topics

Java Tutorial
1664
14
PHP Tutorial
1269
29
C# Tutorial
1249
24
PHP and Python: Comparing Two Popular Programming Languages PHP and Python: Comparing Two Popular Programming Languages Apr 14, 2025 am 12:13 AM

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1? Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1? Apr 17, 2025 am 12:06 AM

In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values ​​to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.

PHP in Action: Real-World Examples and Applications PHP in Action: Real-World Examples and Applications Apr 14, 2025 am 12:19 AM

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP: A Key Language for Web Development PHP: A Key Language for Web Development Apr 13, 2025 am 12:08 AM

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

The Enduring Relevance of PHP: Is It Still Alive? The Enduring Relevance of PHP: Is It Still Alive? Apr 14, 2025 am 12:12 AM

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

How does PHP type hinting work, including scalar types, return types, union types, and nullable types? How does PHP type hinting work, including scalar types, return types, union types, and nullable types? Apr 17, 2025 am 12:25 AM

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values ​​and handle functions that may return null values.

PHP and Python: Code Examples and Comparison PHP and Python: Code Examples and Comparison Apr 15, 2025 am 12:07 AM

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP vs. Other Languages: A Comparison PHP vs. Other Languages: A Comparison Apr 13, 2025 am 12:19 AM

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

See all articles