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PHP binary search algorithm example sharing

小云云
小云云Original
2018-02-12 13:12:181554browse

This article mainly introduces the binary search algorithm implemented in PHP, and analyzes the implementation and usage techniques of the PHP binary search algorithm in the form of specific examples. It involves PHP array judgment, traversal, calculation and other related operations. Friends in need can refer to the following , hope it can help everyone.


<?php
$arr = array(4,58,11,34,88,45,32,54,63,78);
function binary($arr,$bnum)
{
 if(is_array($arr) && count($arr) > 0)
 {
 sort($arr);
 $start = 0;
 $end = count($arr)-1;
 $mid = -1;
 while($start <= $end)
 {
  $mid = floor( ($start+$end)/2 );
  if($arr[$mid] == $bnum)
  {
  return $arr[$mid];
  }else if($arr[$mid] < $bnum)
  {
  $start = $mid +1;
  }else if($arr[$mid] > $bnum)
  {
  $end = $mid - 1;
  }
 }
 return -1;
 }
}
$mm = binary($arr,32);
print_r($mm);//输出32
?>

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