How to remove duplicate characters from php string

How to remove duplicate characters from a php string: first split the string through the "mbstringtoarray" method; then use the "array_unique" function to filter duplicate characters; and finally merge the arrays through the "implode" method.

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php removes repeated characters from a string

<?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;
?>

Execution result:

蚂蚁学院，我非常爱你!520134

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