The random numbers generated when PHP data is automatically incremented are not repeated.

This article mainly introduces how to use PHP to generate non-repeating random numbers based on auto-increment data. The article gives detailed sample codes for your reference and study. It has certain reference value for everyone. Friends who need it Let’s take a look together below.

This article mainly introduces the relevant content of PHP based on self-increasing data to generate non-repeating random numbers. It is shared for everyone's reference and learning. It is useless to say more below and go directly to the code:

Key words The point is that the number of generated auto-increment data bits is controlled in two places

## 1. If the $base base array is an 8-bit array It must be 8 digits

2. $i is an auto-incrementing number, and the auto-incrementing number cannot exceed 8 digits

The result of the current simple analysis is the above. If you want global non-duplication, it is recommended to use uuid or the like.

Sample code:

function swap($n,$base) {
$mask = 19; //1 + 2 + 16
 $n = intval($n, 10);
 $idx = $n & $mask;//取出标志位
 $xor = $base[$idx] ^ $n;//根据标识为找到对应的base，异或n
 
 return (($xor | $mask) ^ $mask) | $idx;//覆盖标识位
}
$newArray=[];
$base = array (
 0 => 1918407,
 1 => 5529570,
 2 => 6527234,
 3 => 6550962,
 4 => 8054672,
 5 => 3141234,
 6 => 2125630,
 7 => 6978033,
 8 => 4623630,
 9 => 4736420,
 10 => 7767295,
 11 => 9679880,
 12 => 1665600,
 13 => 6044373,
 14 => 4661383,
 15 => 5771843,
 16 => 2206123,
 17 => 5685396,
 18 => 5571647,
 19 => 7178311,
);
for ($i=0;$i<1000000;$i++) {
 $newArray[]= swap($i,$base)."\r\n";
}

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