如何在php中实现字符串匹配的蛮力算法？

Question

我有2个表和方案是这样的：

tb_keywords

id_keyword 
keyword 

tb_post

id_post 
description 

我想要实现在PHP蜇匹配蛮力算法。如果描述符合/类似于关键字，则此描述将插入到tb_post中。我试图做这个工作，但它不工作。 没有错误信息，只是给出了空白的结果。

HTML

<textarea type="text" class="form-control" name="description" id="description" placeholder="Description" required /></textarea> 

PHP

$description = trim($_POST['description']); 
$check = $db_con->prepare("SELECT * FROM tb_keywords"); 
$check->execute(); 
$row=$check->fetch(PDO::FETCH_OBJ); 
$positive = $row->keyword; 

function brute_force($positive, $description) 
{ 
    $n = strlen($description); 
    $m = strlen($positive); 
    for ($i = 0; i < $n-$m; $i++) { 
     $j = 0; 
     while ($j < $m && $description[$i+$j] == $positive[$j]) { 
      $j++; 
     } 
     if ($j == $m) { 
      return $i; 
     } 
     return -1; 
    } 
    $find[$i]=brute_force($positive, $description); 
    $create=$db_con->prepare("INSERT INTO tb_post(description) VALUES(:description)"); 
    $create->bindParam(":description", $description); 
    $create->execute(); 
    $row=$create->rowCount(); 
    if($row>0) { 
     echo "success"; 
    } else { 
     echo "fail"; 
    } 

} 

Answer 1

要查看是否有特定的词是在文本，您可以使用正则表达式用字边界。

即

的preg_match（ “/ \ bPHP \ B /”， “在PHP中的正则表达式”）＃在 字符串匹配单词 “PHP”

$description = trim($_POST['description']); 
$check = $db_con->prepare("SELECT * FROM tb_keywords"); 
$check->execute(); 
while($row = $check->fetch(PDO::FETCH_ASSOC)) { 
    $search = $row['keyword']; 
    if (preg_match("/\b$search\b/", $description)) { 
     $create=$db_con->prepare("INSERT INTO tb_post(description) VALUES(:description)"); 
     $create->bindParam(":description", $description); 
     $create->execute(); 
     $row=$create->rowCount(); 
     if($row>0) { 
      echo "success"; 
     } else { 
      echo "fail"; 
     } 
    } 
}