How to remove identical strings in php

Method: 1. Use "implode("",array_unique(str_split(string, 1)));" to remove the same string; 2. Use "implode("",array_unique(preg_split(regular expression , string)))" to remove identical strings.

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php method to remove identical strings:

1. If there are no Chinese characters in the string and they are all ASCII characters, it is very simple:

<?php
$str = &#39;aabbcc11333332.axyz&#39;;
echo implode("",array_unique(str_split($str, 1)));
//输出 abc132.xyz

2 . If there are Chinese characters in the string and the encoding is UTF8, you can use the following method:

<?php
$str="爱爱E爱EE族族";
$arr = preg_split("/(?<!^)(?!$)/u", $str); //转换成数组
$arr = array_unique($arr); //除去重复字符
echo implode("", $arr);  //还原成字符串
//输出: 爱E族

3. If there are Chinese characters in the string and the encoding is not UTF8, you can use the following method (the encoding can be specified):

<?php
//按长度分割含中文字符串的自定义函数
function mb_str_split($str, $length=1, $encoding=&#39;UTF-8&#39;) {
    $arr = array();
    for($i=0; $i<mb_strlen($str, $encoding); $i+=$length) {
        $arr[] = mb_substr($str, $i, $length, $encoding);
    }
    return $arr;
}
 
$arr = mb_str_split("爱爱爱E族族", 1, &#39;GBK&#39;);
$arr = array_unique($arr); //除去重复字符
echo implode("", $arr);  //还原成字符串
//输出: 爱E族

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