PHP binary search algorithm example sharing

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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