本文实例讲述了php实现的二分查找算法。分享给大家供大家参考,具体如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
<?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 ?> |
希望本文所述对大家PHP程序设计有所帮助。