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Binary search

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Submitted on: 10/1/2002 2:00:40 AM
By: Bhushan Paranjpe  
Level: Beginner
User Rating: Unrated
Compatibility:PHP 3.0

Users have accessed this code 678 times.
 

(About the author)
 
     Binary search algorithm function. Takes an array as an argument and the element to be searched for in the array. Returns '1' if found, '0' if not. The code can be modified slightly to return the array index of the found element.
 
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Terms of Agreement:   
By using this code, you agree to the following terms...   
1) You may use this code in your own programs (and may compile it into a program and distribute it in compiled format for languages that allow it) freely and with no charge.   
2) You MAY NOT redistribute this code (for example to a web site) without written permission from the original author. Failure to do so is a violation of copyright laws.   
3) You may link to this code from another website, but ONLY if it is not wrapped in a frame. 
4) You will abide by any additional copyright restrictions which the author may have placed in the code or code's description.

    //**************************************
    //     
    // Name: Binary search
    // Description:Binary search algorithm f
    //     unction. Takes an array as an argument a
    //     nd the element 
    to be searched for in the array. Returns '1' if found, '0' if not. 
    The code can be modified slightly to return the array index of the found element.
    // By: Bhushan Paranjpe
    //
    //This code is copyrighted and has    // limited warranties.Please see http://
    //     www.Planet-Source-Code.com/xq/ASP/txtCod
    //     eId.755/lngWId.8/qx/vb/scripts/ShowCode.
    //     htm    //for details.    //**************************************
    //     
    
    <?php
    function BinarySearch($ArrayToSearch/*array to search through*/, $SearchFor/*element to search for*/)
    {
    sort($ArrayToSearch);//must sort the array
    //index	 
    $first=0;
    $last=count($ArrayToSearch)-1;
    $mid=($first+$last)/2;
    $SearchFor=strval(trim($SearchFor)); 
    while
    (
    ($first<=$last)&&
    	 (strval(trim($ArrayToSearch[$mid]))!=$SearchFor)
    )	 
    {
    if(strcmp(strtolower($SearchFor),strtolower($ArrayToSearch[$mid]))<0)
    	 {$last=$mid-1;}//search the upper half 
    	 else
    	 if(strcmp(strtolower($SearchFor),strtolower($ArrayToSearch[$mid]))>0)
    	{$first=$mid+1;}//search the lower half
    	 $mid=($first+$last)/2;//new mid point
    }	
    if(strval(trim($ArrayToSearch[$mid]))==$SearchFor) 	
    //{return $mid;} --> if your objectiv
    //     e is to return the index 
    	{return 1;}
    else
    {return 0;}
    //{return -1;} --> if your objective 
    //     is to return the index 
    }
    ?>


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