PHP - 在字符串中搜索关键字并提高提取关键字的质量和准确性

我有一段PHP代码如下:

$Keywords = array(
            ', JOE.' => '1',
            ', JOE' => '2',
            'JOE' => '3',
            'JOE.' => '4',
            '/JOE' => '5',
            '/JOE/' => '6',
            'JOE/.' => '7',
            ',JOE.' => '8'
    );
$Text = "JOE is JOE is JOE is JOE is JOE is JOE is JOE. Hello , JOE. Hey ,JOE. Come on , JOE. Dude,JOE/. Shut up ,JOE. What is the meaning of /JOE/? Of course, JOE";

extract_keyword ($Keywords, $Text);

function extract_keyword ($Keywords, $Text){
    mb_internal_encoding('UTF-8');

    uksort($Keywords, function ($a, $b) {
        $as = mb_strlen($a);
        $bs = mb_strlen($b);

        if ($as > $bs) {
            return -1;
        }
        else if ($bs > $as) {
            return 1;
        }
        return 0;

    });

    $Keywords_ci = array();

    foreach ($Keywords as $k => $v) {
        $Keywords_ci[$k] = $v;
    }

    $re = '/\b(?:' . join('|', array_map(function($keyword) {
        return preg_quote($keyword, '/');
    }, array_keys($Keywords))) . ')\b/i';

    $KeywordArrayKey = array();
    $KeywordArrayValue = array();
    $NewArray = array();
    preg_match_all($re, $Text, $matches);
    foreach ($matches[0] as $keyword) {
        $KeywordArrayKey[] = $keyword;
        $KeywordArrayValue[] = $Keywords_ci[$keyword];
        if(!empty($keyword) && !empty($Keywords_ci[$keyword])) {
        $NewArray[] = array($keyword => $Keywords_ci[$keyword]);
        }
    }
    print_r($NewArray) ."<br><br>";
}

代码回显如下:

Array (
[0] => Array ( [JOE] => 3 )
[1] => Array ( [JOE] => 3 )
[2] => Array ( [JOE] => 3 )
[3] => Array ( [JOE] => 3 )
[4] => Array ( [JOE] => 3 )
[5] => Array ( [JOE] => 3 )
[6] => Array ( [JOE] => 3 )
[7] => Array ( [JOE] => 3 )
[8] => Array ( [JOE] => 3 )
[9] => Array ( [JOE] => 3 )
[10] => Array ( [JOE] => 3 )
[11] => Array ( [JOE] => 3 )
[12] => Array ( [JOE] => 3 )
[13] => Array ( [, JOE] => 2 ) )

如您所见，问题在于代码不够准确，无法提取有关键字的 $keywords ，例如 ', JOE.' => '1' or 'JOE/.' => '7' 。事实上，我的目标是将 '/JOE' => '5' 与 '/JOE/' => '6' 或 'JOE.' => '4' 等完全分开。请您看一下代码，让我知道如何提高提取关键字的质量/准确性？谢谢你的帮助。
注 1: print_r($Keywords_ci); 打印 Array ( [, JOE.] => 1 [JOE/.] => 7 [,JOE.] => 8 [, JOE] => 2 [/JOE/] => 6 [JOE.] => 4 [/JOE] => 5 [JOE] => 3 ) ，但我正在寻找的是在 '/JOE/' => '6' 中回显可用关键字的所有实例，例如 ',JOE.' => '8' 或 $Text 。
注 2:以下是 print_r($NewArray) 的预期打印:

Array (
[0] => Array ( [JOE] => 3 )
[1] => Array ( [JOE] => 3 )
[2] => Array ( [JOE] => 3 )
[3] => Array ( [JOE] => 3 )
[4] => Array ( [JOE] => 3 )
[5] => Array ( [JOE] => 3 )
[6] => Array ( [JOE.] => 4 )
[7] => Array ( [, JOE.] => 1 )
[8] => Array ( [,JOE.] => 8 )
[9] => Array ( [, JOE.] => 1 )
[10] => Array ( [JOE/.] => 7 )
[11] => Array ( [,JOE.] => 8 )
[12] => Array ( [/JOE/] => 6 )
[13] => Array ( [, JOE] => 2 ) )

最佳答案

将关键字从最长到最短排序后，您会知道将在该字符串的任何可能子集之前(/JOE//JOE之前)检查一个字符串。因此，您可以使用str_replace删除实际的匹配项，因此在搜索/JOE时不匹配/JOE/(假设您之前搜索过/JOE/)。使用str_replace的count参数获取匹配项的数量

<?php
$Keywords = array(
            ', JOE.' => '1',
            ', JOE' => '2',
            'JOE' => '3',
            'JOE.' => '4',
            '/JOE' => '5',
            '/JOE/' => '6',
            'JOE/.' => '7',
            ',JOE.' => '8'
    );
$Text = "JOE is JOE. Hello , JOE. Hey ,JOE. Come on , JOE. Dude,JOE/. Shut up ,JOE. What is the meaning of /JOE/? Of course, JOE";

uksort($Keywords, function ($a, $b) {
        $as = mb_strlen($a);
        $bs = mb_strlen($b);

        if ($as > $bs) {
            return -1;
        }
        else if ($bs > $as) {
            return 1;
        }
        return 0;

    });

$copy = $Text;
foreach ($Keywords as $keyword => $value) {
   $copy = str_replace($keyword, '', $copy, $count);
   if ($count > 0) {
       $result[$keyword] = $value;
   }
}

print_r($result);

您可以使用$ count变量实际计算该字符串存在的次数。

关于PHP - 在字符串中搜索关键字并提高提取关键字的质量和准确性，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/24715628/