PHP Parse error: syntax error, unexpected T

hi i am getting an error during my execution of the code : PHP Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting ',' or ';' in C:apache2triadhtdocsimagedisplay.php on line 28

<?php

$dir= "C:apache2triadhtdocsphppgadminimagesphpimages";

$file_display= array('jpg', 'jpeg', 'png', 'gif');

if(file_exists($dir)== false) 
{
  echo "directory x not found";
}
else
{
  $dir_content= scandir($dir);

  foreach($dir_content as $file)
  {
    $file_type = strtolower(end(explode('.', $file)));

    // echo "$file <br> ";

    if($file !=='.' && $file !=='..')
    {
      //echo "$file <br> ";   
      echo "<img src="', $dir, '/', $file, '" alt="', $file, '"/>";
    }      
  }   
}
?>

please help

---

echo "<img src="', $dir, '/', $file, '" alt="', $file, '"/>";
               ^^-- here

你基本上有两个不同的字符串背对背，使这条线完全无效。

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