Count number of occurences of words from one array in another array

Question

I have two arrays: $story and $languages

Now I want to know how many times elements or values in $languages appear in $story array. This means how many times "php", "javascript", "mysql" of $languages array appeared in $story?

How can I do this in php? Can anyone help? Here are my arrays...

$story = array();
$story[] = 'As a developer, I want to refactor the PHP & javascript so that it has less duplication';
$story[] = ' As a developer, I want to configure Jenkins so that we have continuous integration and I love mysql';
$story[] = ' As a tester, I want the test cases defined so I can test the system using php language and phpunit framework';

$languages = array(
  'php', 'javascript', 'mysql'  
);

stackoverflow.com/questions/14610086/php-words-array-count

Marc B
– Marc B

2015-08-06 15:13:45 +00:00
Commented Aug 6, 2015 at 15:13 — Marc B
– Marc B, Commented Aug 6, 2015 at 15:13

Madness · Accepted Answer · 2015-08-06 15:25:36Z

2

I would store the totals in your $languages array. No need to check the count before adding, because adding 0 won't affect your totals.

<?
    $story = array();
    $story[] = 'As a developer, I want to refactor the PHP & javascript so that it has less duplication';
    $story[] = ' As a developer, I want to configure Jenkins so that we have continuous integration and I love mysql';
    $story[] = ' As a tester, I want the test cases defined so I can test the system using php language and phpunit framework';

    $languages = array(
        'php' => 0,
        'javascript' => 0,
        'mysql' => 0
    );

    foreach ($story as $sk => $sv){
        foreach ($languages as $lk => $lv){
            $languages[$lk] += substr_count($story[$sk], $lk);
        }
    }

    print_r($languages);
?>

answered Aug 6, 2015 at 15:25

Madness

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4 Comments

Jonny 5 Over a year ago

Good answer. If word boundaries or caseless matching is needed, could replace the substr_count part with $languages[$lk] += preg_match_all('/\b'.preg_quote($lk, "/").'\b/i', $story[$sk]);

Madness Over a year ago

Hm, but not overlaps, will the regex fix that? I really want to believe the OP won't have any overlaps. Please, please no whammies....

Jonny 5 Over a year ago

Overlapping was not mentioned by OP also not caseless matching or boundaries, just wanted to mention as a supplement :]

Madness Over a year ago

Yeah, I would expect any reasonable "Story" to have mixed case and boundary issues. Overlaps would mean the story was terrible in the first place.

ImmortalPC · Accepted Answer · 2015-08-06 15:37:35Z

1

With 2 loops: https://ideone.com/grRBeG

$story = array();
$story[] = 'As a developer, I want to refactor the PHP & javascript so that it has less duplication';
$story[] = ' As a developer, I want to configure Jenkins so that we have continuous integration and I love mysql';
$story[] = ' As a tester, I want the test cases defined so I can test the system using php language and phpunit framework';

$languages = [
    'php' => 0,
    'javascript' => 0,
    'mysql' => 0,
];

for( $i=0,$size=count($story); $i<$size; ++$i )
{
    $text = strtolower($story[$i]);
    foreach( $languages as $word => $nb )
        $languages[$word] += substr_count($text, $word);
}

var_export($languages);

answered Aug 6, 2015 at 15:37

ImmortalPC

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2 Comments

Madness Over a year ago

Since this is mostly a copy of my answer, I should reiterate what the comments have said, substr_count takes care of case matching. So that you know, running strtolower in this case only adds processing and serves no purpose.

Madness Over a year ago

I won't down vote you or anything, not worth it, keep your 10pts, but others coming to this page should know to avoid this answer, regardless of how tacky it is.

score 0 · Accepted Answer · 2015-08-06 15:27:06Z

0

Run two foreach loops as shown below.

$finalCount = array();
foreach($story as $current)
{
      $count=0;
     foreach($languages as $language){
         if (substr_count($current,$language) !== false) {
           $count++
         }
     }
     $finalCount[$language] = $count;

}

edited Aug 6, 2015 at 15:27

answered Aug 6, 2015 at 15:16

user5139444

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