<?php
 
$haystack = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ipsum lorem dolor Curabitur ac risus nunc. Dolor ipsum lorem.';
$needle = 'Lorem ipsum dolor';
 
$hayWords = str_word_count(
    strtolower($haystack), 
    1
);
$needleWords = str_word_count(
    strtolower($needle), 
    1
);
$needleWordsCount = count($needleWords);
 
$foundWords = array_intersect(
    $hayWords, 
    $needleWords
);
 
$count = array_reduce(
    array_keys($foundWords),
    function($counter, $item) use ($foundWords, $needleWordsCount) {
        for($i = $item; $i < $item + $needleWordsCount; ++$i) {
            if (!isset($foundWords[$i]))
                return $counter;
        }
        return ++$counter;
    },
    0
);
 
var_dump($count);
echo var_dump(getrusage());
 
?>

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