PHP binary search example sharing

This article mainly shares binary search PHP examples with you. This article mainly shares it with you in the form of code. I hope it can help you.

Easy to use

/**
*  二分查找
**/
function binarySearch(Array $arr, $target) {  
   $low = 0;  
   $high = count($arr) - 1;  
     
   while($low <= $high) {  
       $mid = floor(($low + $high) / 2);  
       #找到元素。  
       if($arr[$mid] == $target) return $mid;  
       #中元素比目标大,查找左部。  
       if($arr[$mid] > $target) $high = $mid - 1;  
       #重元素比目标小,查找右部。  
       if($arr[$mid] < $target) $low = $mid + 1;  
   }  
  
   #查找失败  
   return false;  
}  
  
$arr = array(1, 3, 5, 7, 9, 11);  
$inx = binarySearch($arr, 7);  
echo $inx."<hr/>"; // 索引位置。

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