Backend Development
PHP Tutorial
Detailed explanation of php techniques for using mb_strpos in PHP
Detailed explanation of php techniques for using mb_strpos in PHP
This article mainly introduces the detailed use of mb_strpos in PHP. It analyzes the usage in detail through the use of syntax and examples. Friends who need it can refer to it.
mb_strpos
(PHP 4 >= 4.0.6, PHP 5, PHP 7)
mb_strpos — Find position of first occurrence of string in a string
mb_strpos — Find the first occurrence of a string within another string
Description
int mb_strpos ( string $haystack , string $needle [, int $offset = 0 [, string $encoding = mb_internal_encoding() ]] ) //Finds position of the first occurrence of a string in a string. // 查找 string 在一个 string 中首次出现的位置。 //Performs a multi-byte safe strpos() operation based on number of characters. The first character's position is 0, the second character position is 1, and so on. // 基于字符数执行一个多字节安全的 strpos() 操作。 第一个字符的位置是 0，第二个字符的位置是 1，以此类推。
Parameters
haystack
The string being checked.
The string being checked.
needle
The string to find in haystack. In contrast with strpos(), numeric values are not applied as the ordinal value of a character.
Find this string in haystack. Unlike strpos(), numeric values are not treated as character sequential values.
offset
The search offset. If it is not specified, 0 is used. A negative offset counts from the end of the string.
#The offset of the search position. If this parameter is not provided, 0 will be used. Negative offsets will be counted from the end of the string.
encoding
The encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be used.
#encoding parameter is the character encoding. If omitted, the internal character encoding is used.
Return Values
Returns the numeric position of the first occurrence of needle in the haystack string. If needle is not found, it returns FALSE.
Returns the value of the first occurrence of needle in the haystack of string. If needle is not found, it returns FALSE.
Example
<?php
/** * Created by PhpStorm.
* User: zhangrongxiang
* Date: 2018/2/2
* Time: 下午11:16
*/
$str = "Hello World! Hello PHP";
$pos = mb_strpos( $str, "Hello", 0, mb_internal_encoding() );
echo $pos .PHP_EOL;//0
$pos = mb_strpos( $str, "Hello", 2, mb_internal_encoding() );
echo $pos .PHP_EOL;//13
function mb_str_replace( $haystack, $search, $replace, $offset = 0, $encoding = 'auto' ) {
$len_sch = mb_strlen( $search, $encoding);
$len_rep = mb_strlen( $replace, $encoding);
while ( ( $offset = mb_strpos( $haystack, $search, $offset, $encoding ) ) !== false ) {
$haystack = mb_substr( $haystack, 0, $offset, $encoding)
. $replace
. MB_SUBSTR ($ HayStack, $ Offset $ len_sch,
$le = mb_strlen( $haystack ) - mb_strlen( $search ) mb_strlen( $replace ),
$encoding );
//echo $le.PHP_EOL;
$offset = $offset $len_rep;
If ( $offset > mb_strlen( $haystack, $encoding ) ) {
Break;
}
}
return $haystack;
}
$replace = mb_str_replace( "hello world !hello world !hello world !hello world !", "hello", "hi" );
echo $replace .PHP_EOL; //hi world !hi world !hi world !hi world !
//hi PHP !hi PHP !hi PHP !hi PHP !
echo mb_str_replace( $replace, "world", "PHP" ) .PHP_EOL;
echo mb_str_replace( $replace, " ", "-" ) . PHP_EOL;
//PHP is the best language in the worldThe above is the detailed content of Detailed explanation of php techniques for using mb_strpos in PHP. 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 Installation and Upgrade guide for Ubuntu and Debian
Dec 24, 2024 pm 04:42 PM
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
7 PHP Functions I Regret I Didn't Know Before
Nov 13, 2024 am 09:42 AM
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
How To Set Up Visual Studio Code (VS Code) for PHP Development
Dec 20, 2024 am 11:31 AM
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
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,
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
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
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
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
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.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
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.
