How PHP generates 10,000 non-repeating data,

Ask: How PHP generates 10,000 non-repeating data

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10,000 what kind of data

1-10000 is not repeated.

Each time you want to generate 10,000 (or more), and it is a number. 17 bits per piece of data

Organize a 17-bit current time (accurate to seconds) value plus 1, and then from 1 to 10000, each time with the present time plus the value of the loop, there should be no heavy

$FN = ' random number. txt '; for ($i =0; $i <10000; $i + +) {  file_put_contents ($FN, sprintf ('%07d%08d ', rand (0, 9999999), rand (0, 99999999)). Php_eol, file_append);}

File random number in. txt is the result you want.

Time can be represented by time stamps.

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