How to remove repeated letters in string in php

php method to remove duplicate letters: first use the str_split() function to convert the string into a character array; then use the array_unique() function to remove duplicate values ​​in the array; finally use implode() to convert the processed Just convert the array into a string.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php removes duplicates in the string Letters

<?php
$str = &#39;abacade&#39;;
$array = str_split($str);
$str = implode(array_unique($array));
var_dump($str);
?>

Output:

## Related function description:

str_split() function splits a string into an array. The syntax is as follows:

str_split(string,length)

Function is used to remove duplicate values ​​from an array. If two or more array values ​​are the same, only the first value is retained and the other values ​​are removed. Note: The retained array will retain the key type of the first array item.

Syntax

array_unique(array)

implode(separator,array)

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