Fix csv line separator

script.php

<?php
/** @var string $path */
$path = 'import-files/';
/** @var string $file */
$file = 'test.csv';
/** @var string $realFile */
$realFile = $path.$file;

function putCSVLineSeparatorToLF($file){
    if (!file_exists($file)){
        return false;
    }

    /** @var string $content */
    $content = file_get_contents($file);
    /** @var string $newContent */
    $newContent = str_replace("\r\n", "\n", $content);
    file_put_contents($file, $newContent);

    return true;
}

/** @var boolean $modifs */
$newFile = putCSVLineSeparatorToLF($realFile);
/** @var string $message */
$message = 'it\'s NOK';

if ($newFile){
    /** @var string $message */
    $message = 'it\'s OK';
}

echo $message;