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Home php教程 php手冊 php中單字符串匹配算法實(shí)例

php中單字符串匹配算法實(shí)例

May 26, 2016 am 08:21 AM

前面介紹過一個字符呂匹配例子,這里再介紹一個單字符串匹配例子,希望對各位會有所幫助,代碼如下:

<?php 
	/* 
	最簡單字符串匹配算法php實(shí)現(xiàn)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.遍歷$str字符串 
	for($i=0;$i<$strlen;$i++){ 
	    if($i+$searchlen>$strlen){ 
	        echo &#39;超出長度&#39;;break; 
	    } 
	 
	    $match=true; 
	 
	     
	//2.遍歷要搜索的字符串$search,進(jìn)行對比 
	    for($j=0;$j<$searchlen;$j++){ 
	 
	        if($str[$i+$j]!=$search[$j]){ 
	            $match=false; 
	            break; 
	        } 
	        $k=$i+$j; 
	        if($match){ 
	            if($j==$searchlen-1){ 
	                echo "{$str}第{$i}個位置開始為{$search}\n";break; 
	            }//開源代碼phprm.com 
	        } 
	 
	    } 
	 
	} 
	 
	

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