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示例

JS

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function generate_password(length = 16) {
    let chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
    let password = ''
    for (let i = 0; i < length; i++) {
        password += chars[ Number.parseInt(chars.length * Math.random()) ]
    }
    return password
}
console.log(generate_password(16))

PHP

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<?php 
function generate_password( $length = 16 ) {
    $chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
    $password = '';
    for ( $i = 0; $i < $length; $i++ ) 
    {
        $password .= $chars[ mt_rand(0, strlen($chars) - 1) ];
    }
    return $password;
}
// 使用
echo generate_password(16);
?>