二分法查找数组是否包含某一元素_PHP教程

二分法查找数组是否包含某一元素，兼容正反序，代码实现：

  
  = (int)['key' 
  search( ,        = ()-1      = 0      = [] [ 
      (          = +          = (int)(%2 == 1 ? (/2) : /2 
          (               -1         }   ( == [              1         }   ( > [              ?  = +1 :  = -1         }   ( [              ?  = -1 :  = +1    
  =      '4', '5', '7', '8', '9', '10', '11', '12'
  
  search(,  
 
 (  search(, );

这个没考虑非顺序键的数组，主要是方法，如果需要大家可以自己扩展下。

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