Generate a certain number of non-repeating random number of PHP code

Generate a certain number of non-repeating random numbers /* * Array Unique_rand (int $min, int $max, int $num) * Generate a certain number of non-repeating random numbers * $min and $max: Specify the range of random numbers * $num: Specify the number of builds */ function Unique_rand ($min, $max, $num) { $count = 0; $return = Array (); while ($count < $num) { $return [] = Mt_rand ($min, $max); $return = Array_flip (Array_flip ($return)); $count = count ($return); } Shuffle ($return); return $return; } $arr = Unique_rand (1, 25, 16); Sort ($arr); $result = "; for ($i =0; $i < count ($arr); $i + +) { $result. = $arr [$i]. ', '; } $result = substr ($result, 0,-1); echo $result; ?> Copy Code

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