Common words found

If you're new to PHP and want to learn the language, this article can help.  Just skip over the parts you already know from work experience or academic study.
https://www.experts-exchange.com/articles/11769/And-by-the-way-I-am-New-to-PHP.html

<?php // demo/temp_ramu.php
/**
 * https://www.experts-exchange.com/questions/29012186/Common-words-found.html
 */
error_reporting(E_ALL);
echo '<pre>';

// A TEXT TO BUILD A CONCORDANCE
$text = <<<EOD
This is the list of words that should be excluded from the lookup.  Mostly these
are common words without "term of art" meanings.  You might want to add to this
list to suppress false-positive matches in your industry.  If you're a church
you might want to exclude "bible" or "worship"; if you're a car dealership you
might want to exclude "car" from the search, etc.
EOD;

// A COLLECTION OF WORDS TO SEARCH FOR IN THE TEXT
$find = <<<EOD
might
exclude
gooseball
EOD;

// BUILD THE CONCORDANCE
$text = preg_replace('/[^A-Z]/i', ' ', $text); // ALPHABET ONLY
$text = preg_replace('/\s\s+/',   ' ', $text); // NORMALIZE WHITESPACE
$text = explode(' ', $text);

$list = [];
foreach ($text as $word)
{
    $word = strtolower($word);
    if (!array_key_exists($word, $list)) $list[$word] = 0;
    $list[$word]++;
}

// FIND THE OCCURRENCES OF THE SEARCH WORDS
$find = preg_replace('/[^A-Z]/i', ' ', $find); // ALPHABET ONLY
$find = preg_replace('/\s\s+/',   ' ', $find); // NORMALIZE WHITESPACE
$find = explode(' ', $find);

foreach ($find as $word)
{
    if (array_key_exists($word, $list))
    {
        echo PHP_EOL . "$word: " . $list[$word];
    }
    else
    {
        echo PHP_EOL . "$word not found";
    }
}

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Outputs:

might: 3
exclude: 2
gooseball not found

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