注意:未定义的偏移量:

我完成了代码，它是这样的：

<?php
 ini_set('memory_limit', '128M');
    function validate_xml(&$filename)
    {
    libxml_use_internal_errors(true);
    $doc = new DOMDocument('1.0', 'utf-8');
    $xml = file_get_contents($filename); 
    $doc->loadXML($xml); 
    $errors = libxml_get_errors();

    $lines = file($filename);
    $output = fopen('errors.txt', 'a');
    $distinctErrors = array();
    foreach ($errors as $error)
    {
        if (!array_key_exists($error->line, $distinctErrors))
        {
            $distinctErrors[$error->line] = $error->message;
            fwrite($output, "Filename: {$filename}.  Error on line: {$error->line}. {$lines[$error->line-1]}'n");
        }
    }
    fclose($output);
}

if(isset($_POST['SubmitCheck'])) {

        $directory = $_POST['Path'];
        if ( ! is_dir($directory)) {
              exit('Invalid diretory path');
                }
                else
                {
                  echo "The dir is: $directory". '<br />';
                        chdir($directory);
                        foreach (glob("*.xml") as $filename) {  
                        validate_xml($filename);                        
                        }  
              }
        }
        else {
        ?>
        <form id="Form1" action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
            Path: <input type="text" name="Path"><br>
            <input type="hidden" name="SubmitCheck" value="sent">
            <input type="Submit" name="Form1_Submit" value="Path">
        </form>
        <?php
        }
?>

它给了我

Notice: Undefined offset: 16032 in C:'xampp'htdocs'www'php-xml'nou.php on line 23
Notice: Undefined offset: 16051 in C:'xampp'htdocs'www'php-xml'nou.php on line 23
Notice: Undefined offset: 16060 in C:'xampp'htdocs'www'php-xml'nou.php on line 23
Notice: Undefined offset: 16075 in C:'xampp'htdocs'www'php-xml'nou.php on line 23
Notice: Undefined offset: 16078 in C:'xampp'htdocs'www'php-xml'nou.php on line 23
Notice: Undefined offset: 16101 in C:'xampp'htdocs'www'php-xml'nou.php on line 23
Notice: Undefined offset: 16110 in C:'xampp'htdocs'www'php-xml'nou.php on line 23
Notice: Undefined offset: 16167 in C:'xampp'htdocs'www'php-xml'nou.php on line 23

问题是我有 3 个大 xml（每个 11MB）。当我在 3 个小 xml 上尝试脚本时，它起作用了。也为每个大的xml单独工作。我不知道该怎么办，我尝试增加php_ini的内存限制......仍然不知道发生了什么。