How to use php array to implement random number selection for two-color balls

To implement the random number selection function of the double color ball in the lottery sales website, you need to use the PHP language and knowledge of arrays. This article will introduce in detail how to implement random number selection for two-color balls through PHP arrays.

1. Introduction to Double Color Ball Lottery

Double Color Ball is a common method of playing Chinese welfare lottery, and it is also one of the favorite lottery types among lottery players across the country. The rules of the game are to choose 6 numbers from 33 red balls and 1 number from 16 blue balls. The red ball number range is 1-33 and the blue ball number range is 1-16. You can make single bets or multiple bets. You can choose up to 7 red balls and one blue ball for a single bet.

2. Use PHP arrays to implement random number selection

1. Define arrays of red balls and blue balls

In PHP, you can use arrays to represent a group data. First, we need to define arrays of red ball numbers and blue ball numbers.

// 定义红球号码数组
$red_ball = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33);

// 定义蓝球号码数组
$blue_ball = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);

In the above code, we use the array keyword to define arrays of red ball numbers and blue ball numbers, which contain 33 red ball and 16 blue ball numbers respectively.

2. Implementing random number selection logic

The logic of random number selection is to randomly select 6 red ball numbers from the red ball number array and randomly select one from the blue ball number array. Blue ball number. In PHP, you can use the array_rand() function to randomly select one or more elements from an array. The following is the code to implement the random number selection logic:

// 从红球中随机选6个号码
$selected_red = array_rand($red_ball, 6);

// 从蓝球中随机选1个号码
$selected_blue = array_rand($blue_ball, 1);

In the above code, we use the array_rand() function to randomly select 6 numbers from the red ball number array, and from the blue ball number Randomly select a number from the array and store the selected number in the $selected_red and $selected_blue variables.

3. Output the selected number

Finally, we need to output the selected number to the page. In PHP, you can use foreach to loop through the elements in the array and output each element to the page. The following is the code to output the selected number:

// 输出选中的红球号码
echo '您选的红球号码是：';
foreach ($selected_red as $number) {
    echo $red_ball[$number] . ' ';
}

// 输出选中的蓝球号码
echo '<br>您选的蓝球号码是：';
echo $blue_ball[$selected_blue];

In the above code, we use foreach to loop through the selected red ball number array and output each number to the page; at the same time , the selected basketball number will also be output to the page.

3. Complete code

The following is the complete PHP code, which can be saved as a PHP file and accessed in the browser to select random numbers.

<?php // 定义红球号码数组
$red_ball = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33);

// 定义蓝球号码数组
$blue_ball = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);

// 从红球中随机选6个号码
$selected_red = array_rand($red_ball, 6);

// 从蓝球中随机选1个号码
$selected_blue = array_rand($blue_ball, 1);

// 输出选中的红球号码
echo &#39;您选的红球号码是：&#39;;
foreach ($selected_red as $number) {
    echo $red_ball[$number] . &#39; &#39;;
}

// 输出选中的蓝球号码
echo &#39;<br>您选的蓝球号码是：';
echo $blue_ball[$selected_blue];
?>

4. Conclusion

This article introduces how to use PHP arrays to implement the random number selection function of two-color balls. By defining arrays of red balls and blue balls, using the array_rand() function to randomly select numbers, and using foreach to loop out the selected numbers, we can easily implement the random number selection function for two-color balls. When developing a lottery website, we can optimize the code as needed, add error handling, data verification and other functions to improve user experience and data security.

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