PHP Dummy File Comparator

compare-files.php

<?php
	
	define("STOP_WORDS", ["the","of","in","and","a","to","on","by","when","or","with","that","this","also","from","an","it","as","these","."]);
	
	function iteratesWords($lineA, $lineB) {
		$wordsA = preg_split("/[\s\.\,\?\;\(\)\-\%\{\}]/", $lineA);
		$wordsB = preg_split("/[\s\.\,\?\;\(\)\-\%\{\}]/", $lineB);
		$words = [];
		foreach($wordsA as $wordA) {
			foreach($wordsB as $wordB) {
				if (strtolower($wordA) === strtolower($wordB) 
					&& !in_array(strtolower($wordA), STOP_WORDS) 
					&& !in_array(strtolower($wordB), STOP_WORDS)
					&& strlen($wordA) > 0
					&& strlen($wordB) > 0) {
					if (!array_key_exists($wordA, $words)) {
						$words[$wordA]['collisions'] = 0;
					}
					$words[$wordA]['collisions']++;					
				}
			}
			if (array_key_exists($wordA, $words)) {
				$words[$wordA]['wordsa'] = count($wordsA);
				$words[$wordA]['wordsb'] = count($wordsB);
			}
		}
		return $words;
	}
	
	function iterateLines($linesA, $linesB, $treshold, $repeatedCallback) {
		$lineANumber = 0;
		foreach($linesA as $lineA) {
			$lineANumber++;
			$lineBNumber = 0;
			foreach($linesB as $lineB) {
				$lineBNumber++;
				$repeated = iteratesWords($lineA, $lineB);				
				if(count(array_keys($repeated)) > 0) {
					$ratioValues = array_reduce($repeated, function ($carry, $item) {
						$carry['collisions'] += $item['collisions'];
						$carry['words'] = min($item['wordsa'],$item['wordsb']);
						return $carry;
					}, ['collisions' => 0, 'words' => 0]);
					$ratio = $ratioValues['collisions']/ $ratioValues['words'];			
					if ($ratio>= $treshold) {
						$repeatedCallback($lineANumber,$lineBNumber, $repeated, $ratio);
					}				
				}
			}			
		}
	}
	
	$linesA = file("./fileA.tex");//Model
	$linesB = file("./fileB.tex");//Mapping
	
	iterateLines($linesA, $linesB, 0.7, function($lineANumber,$lineBNumber, $repeatedWords, $ratio) {
		$words = array_keys($repeatedWords);
		if (count($words) >= 10 ) {
			echo "File A line $lineANumber compared to B line $lineBNumber has ".count($words)."(".(number_format($ratio*100,2))."%) words: ".implode(", ", $words).".".PHP_EOL.PHP_EOL;
		}		
	});	
	
?>