search
Homephp教程php手册php 去除重复的字符串程序代码

在开发时我们可能会经常要去除重复的字符串,下面我以php为例来介绍在php中去除重复的字符串多方法.

正则表达式,代码如下:

echo preg_replace("/([^s]+)*1{2,}([^s]+)*/",'',$string);

用循环我给写了个.

例1,代码如下:

$str = 'abccba 9872223s 12121212 ddd 1234560 vbwwc asasasasas zxzx qaz';  
$source_array = explode(" ", $str);  
foreach($source_array as $key=>$item){  
    $current_str = str_split($item, 1);  
    $current_array=array_count_values($current_str);      
    foreach ($current_array as $k => $it){  
            if($it>=3)  
                unset($source_array[$key]);  
    }  
}  
var_dump($source_array);

例2,代码如下:

<?php
$str = &#39;蚂蚁蚂蚁学院学院,我非常爱爱爱爱爱你!522200011111333311111444&#39;;
function mbstringtoarray($str, $charset) {
    $strlen = mb_strlen($str);
    while ($strlen) {
        $array[] = mb_substr($str, 0, 1, $charset);
        $str = mb_substr($str, 1, $strlen, $charset);
        $strlen = mb_strlen($str);
    }
    return $array;
}
$arr = mbstringtoarray($str, "gbk"); //分割字符串
$arr = array_unique($arr); //过滤重复字符
$str = implode(&#39;&#39;, $arr); //合并数组
echo $str;
?>

另一种办法:preg_replace_callback() 就更简单了,不过 preg_replace() 可以使用e修饰符来实现PREG_REPLACE_EVAL,能达到差不多的效果,代码如下:

<?php
echo preg_replace(&#39;/([^s]+)/e&#39;, &#39;check("1")&#39;, $string);
function check($str) {
    $tmp = count_chars($str, 1);
    sort($tmp);
    return array_pop($tmp) > 2 ? "" : $str;
}
?>


本文地址:

转载随意,但请附上文章地址:-)

Statement
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)
1 months agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
1 months agoBy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
1 months agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Chat Commands and How to Use Them
1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

SublimeText3 English version

SublimeText3 English version

Recommended: Win version, supports code prompts!

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

VSCode Windows 64-bit Download

VSCode Windows 64-bit Download

A free and powerful IDE editor launched by Microsoft

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function