How to remove duplicate characters in PHP?

How to remove duplicate characters in PHP?

First use the "explode()" function to break up the string into an array; then use the "array_unique()" function to remove duplicate elements from the array; finally use the "implode()" function to Arrays can be composed into strings.

Sample code

$str = '1.2.3.1.2.3.4.5.6.7.8.9';
//拆分为数组
$arr = explode('.', $str);
//去除重复字符
$arr = array_unique($arr);
//组成字符串
$str = implode('.', $arr);

Other methods

/*
4.$m = “woxihuanphp”，编程实现：将字符串分割为单个字符存放到一个数组中,并打印数组?
*/
$m='woxihuanphp';
echo $res=trim(chunk_split($m,1,'.'),'.');
$arr1=explode('.',$res);
var_dump($arr1);

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