PHP - search for keywords in a string and improve the quality and accuracy of extracted keywords

Question

I have a PHP code snippet as follows:

$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>";
}

Echos code below:

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 ) )

As you can see, the problem is that the code is not accurate enough to extract $keywordswhere there are keywords such as ', JOE.' => '1' or 'JOE/.' => '7'. In fact, my goal is to precisely separate '/JOE' => '5'from '/JOE/' => '6'or 'JOE.' => '4'etc. Could you take a look at the code and tell me how to improve the quality / accuracy of the extracted keywords? Thank you for your help.

Note 1: print_r($Keywords_ci);prints Array ( [, JOE.] => 1 [JOE/.] => 7 [,JOE.] => 8 [, JOE] => 2 [/JOE/] => 6 [JOE.] => 4 [/JOE] => 5 [JOE] => 3 ), but I'm looking for an echo of all instances of available keywords, such as '/JOE/' => '6'or ',JOE.' => '8'in $Text.

Note 2: Below is the expected print from print_r($NewArray):

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 ) )

Answer 1

, , , (/JOE/before/JOE). , str_replace , , /JOE/ /JOE ( , /JOE/before ). count str_replace,

<?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);

$count, , .