How to hide username in php

php method to hide username: first open the corresponding PHP file; then create a "substr_cut" method; then use the if statement to retain only the first and last characters of the string and hide the intermediate information.

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php Hide Username

/**
 * 只保留字符串首尾字符，隐藏中间用*代替（两个字符时只显示第一个）
 * @param string $user_name 姓名
 * @return string 格式化后的姓名
 */
function substr_cut($user_name){
    $strlen = mb_strlen($user_name, 'utf-8');
    $firstStr = mb_substr($user_name, 0, 1, 'utf-8');
    $lastStr = mb_substr($user_name, -1, 1, 'utf-8');
    if($strlen<2) {
        return $user_name;
    }
    else {
        return $strlen == 2 ? $firstStr . str_repeat(&#39;*&#39;, mb_strlen($user_name, &#39;utf-8&#39;) - 1) : $firstStr . str_repeat("*", $strlen - 2) . $lastStr;
    }
}

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