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php中最简单的字符串匹配算法_PHP

WBOY
WBOYOriginal
2016-05-31 18:15:27966browse

本文实例讲述了php中最简单的字符串匹配算法。分享给大家供大家参考。具体实现方法如下:

代码如下:

/*
最简单字符串匹配算法php实现方式
 
T: ababcabc
P: abc
 
0.          1.          2.
ababcabc    ababcabc    ababcabc
|||          |||          |||
abc          abc          abc
(X)          (X)          (O)
 
3.          4.          5.
ababcabc    ababcabc    ababcabc
   
|||          |||          |||
   
abc          abc          abc
   
(X)          (X)          (O)
*/
 
$str="ababcabc";
$search="abc";
 
$strlen=strlen($str);
$searchlen=strlen($search);
 
//1.遍历$str字符串
for($i=0;$i     if($i+$searchlen>$strlen){
        echo '超出长度';break;
    }
 
    $match=true;
 
    
//2.遍历要搜索的字符串$search,进行对比
    for($j=0;$j  
        if($str[$i+$j]!=$search[$j]){
            $match=false;
            break;
        }
        $k=$i+$j;
        if($match){
            if($j==$searchlen-1){
                echo "{$str}第{$i}个位置开始为{$search}\n";break;
            }
        }
    }
}
?>

希望本文所述对大家的PHP程序设计有所帮助。

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