Home Backend Development PHP Tutorial PHP指定截取字符串中的中英文或数字字符的实例分享_php实例

PHP指定截取字符串中的中英文或数字字符的实例分享_php实例

Jun 07, 2016 pm 05:08 PM
php string

我们在开发过程中,经常会碰到截取中文英文数字等的问题,大家知道中文所占的字符和英文数字是不同的;然后我们就会在项目的common里写一些日常的函数包含时间计算转换和中英文字符截取的函数;比如截取中英文的函数没个几行代码恐怕拿不下来的吧,现在就告诉大家一个简单的(自己本地运行过的),如有问题,请大家多多指教
 

$c = 'ddaabbccaa';
$d = '地球需要我们每个人的爱护';
 
$frist1 = mb_substr( $c, 0, 1 ,"UTF-8"); // d
$delete_last1 = mb_substr($d, -1,1,"UTF-8");  // 护
echo $frist1.'+++'.$delete_last1.'<br/>'; // d+++护
 
$frist2 = mb_substr( $d, 0, 1 ,"UTF-8"); // 地
$delete_last2 = mb_substr($d, -1,1,"UTF-8");  // 护
echo $frist2.'+++'.$delete_last2.'<br/>'; // 地+++护
 
$e = '11aa22cc33';
$f = 'aa地球需要我们每个人的爱护';
$g = '地球需要我们每个人的爱护gg';
$h = '地球需要我们每个人的爱护';
$first3 = mb_substr( $e, 0, 1 ,"UTF-8"); // 1
$last3 = mb_substr( $f, 0, 1 ,"UTF-8"); // a
$delete_last3 = mb_substr($f, -1,1,"UTF-8");  // 护
$delete_last4 = mb_substr($g, -1,1,"UTF-8");  // g
$frist4 = mb_substr( $g, 0, 1 ,"UTF-8");    // 地
$delete_last5 = mb_substr($h, -1,1,"UTF-8");  // 护
 
echo $first3.'+++'.$last3.'---'.$delete_last3.'***'.$delete_last4.'&&&'.$frist4.'<br/>'; // 1+++a---护***g&&&地
echo $last3.'...'.$delete_last3.'<br/>';  // a...护
echo $frist4.'...'.$delete_last5.'<br/>'; // 地...护
// 这样不管字符串里是中英文数字等都是可以的无需判断,如:  ”地...护“ 或者 “地...” 或者 “...护”
Copy after login

PS:过滤字符串中空格的方法

去除字符串首尾中英文空格的方法:

function mbTrim($str)  
{  
  return mb_ereg_replace('(^( | )+|( | )+$)', '', $str);  
} 
Copy after login


下面的正则验证时过滤掉用户输入的连续空格,包括全角空格和半角空格

$user = mb_ereg_replace('^( | )+', '', $user);
$user = mb_ereg_replace('( | )+$', '', $user);

$age = mb_ereg_replace('^( | )+', '', $age);
$age = mb_ereg_replace('( | )+$', '', $age); 

$method = mb_ereg_replace('^( | )+', '', $method);
$method = mb_ereg_replace('( | )+$', '', $method);

$address = mb_ereg_replace('^( | )+', '', $address);
$address = mb_ereg_replace('( | )+$', '', $address); 

Copy after login

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

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
4 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)

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian 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

CakePHP Date and Time CakePHP Date and Time Sep 10, 2024 pm 05:27 PM

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

Discuss CakePHP Discuss CakePHP Sep 10, 2024 pm 05:28 PM

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

CakePHP File upload CakePHP File upload Sep 10, 2024 pm 05:27 PM

To work on file upload we are going to use the form helper. Here, is an example for file upload.

CakePHP Creating Validators CakePHP Creating Validators Sep 10, 2024 pm 05:26 PM

Validator can be created by adding the following two lines in the controller.

CakePHP Logging CakePHP Logging Sep 10, 2024 pm 05:26 PM

Logging in CakePHP is a very easy task. You just have to use one function. You can log errors, exceptions, user activities, action taken by users, for any background process like cronjob. Logging data in CakePHP is easy. The log() function is provide

How To Set Up Visual Studio Code (VS Code) for PHP Development 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

CakePHP Quick Guide CakePHP Quick Guide Sep 10, 2024 pm 05:27 PM

CakePHP is an open source MVC framework. It makes developing, deploying and maintaining applications much easier. CakePHP has a number of libraries to reduce the overload of most common tasks.

See all articles