Add weight factor to random sorting in PHP

Many people know PHP random sorting, but how to implement weighted random sorting? This article will share the data randomly sorted according to weight, I hope it will be helpful to everyone.

The specific implementation method is as follows:

<?php   
/**  
 * @param array $weight 权重  例如array(&#39;a&#39;=>10,&#39;b&#39;=>20,&#39;c&#39;=>50)  
 * @return string key   键名   
 */  
function roll($weight = array()) {   
 $roll = rand ( 1, array_sum ( $weight ) );   
 $_tmpW = 0;   
 $rollnum = 0;   
  foreach ( $weight as $k => $v ) {   
  $min = $_tmpW;   
   $_tmpW += $v;   
   $max = $_tmpW;   
   if ($roll > $min && $roll <= $max) {   
    $rollnum = $k;   
    break;   
   }   
 }   
  return $rollnum;   
}   
 
$row=roll(array(&#39;a&#39;=>10,&#39;b&#39;=>20,&#39;c&#39;=>50));   
echo $row;   
?>

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