How to remove duplicate numbers or characters from string in php

Use php to delete repeated characters in the string.

For example: $str = "aaadddd"The final result should be "ad".

Idea:

Traverse the entire array, then take out the i-th character in turn, store it in a temporary array, and traverse the temporary array at the same time to find out whether the array is already This character exists.

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The code is as follows:

$b = 'aaaaaaaaaaaaddddddttttttffff';  
$tmp = array();  
for($i = 0; $i < strlen($b); $i++){      
    $len = count($tmp);          
    for($j = 0; $j < $len; $j++){          
        if($b[$i] === $tmp[$j]){             
            break;          
        }      
    }      
if($j == $len){  //如果最后的$j和$len相等的话，则表示$tmp临时数组中不存在$b[$i]          
    $tmp[] = $b[$i];      
}  
}  
$result = implode($tmp);  
//输出adtf

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