How can I change create_function to anonymous function?

I am in the lengthy process of modernizing a lot of code on my website to make it php 8.x compliant. I have never really gotten the hang of user defined functions, so the following code was not created by me.

I am trying to change create_function, which has been removed as of php 8.0, to an anonymous function.

I removed the security lines as they were irrelevant.


Any hints as to how I should proceed?

Code:

---

print_r($_FILES)

##produces

$_FILES is Array ( [pix] => Array ( [name] => christmas every day.jpg [type] => image/jpeg [tmp_name] => /tmp/phpWPefKh [error] => 0 [size] => 91284 ) )

---

Here is the outdated code:

Code:

---

<?php
$end=substr($_FILES['pix']['name'],-3,3);
$end=strtolower($end);
if($end=="jpg"||$end=="peg"||$end=="gif"||$end=="png") {}
else {echo"<script type=\"text/javascript\">
 window.location = \"http://www.animeviews.com\"
 </script>";
exit;
}

function or_f($a, $b) {
  return $a || $b;
}

function file_has_extension($fn, $ext) {
  if(is_array($ext))
    return array_reduce(array_map(create_function('$a', 'return file_has_extension(\'' . $fn . '\', $a);'), $ext), 'or_f', false);
  else
    return stripos($fn, '.' . strtolower($ext)) === strlen($fn) - strlen($ext) + 1;
}

$image_extensions = array(
  'png',
  'jpg',
  'jpeg',
  'gif'
);
  if(!isset($_POST['Upload']) and !isset($_POST['Overwrite']))
  {
    include("picform.php");
  } # endif
  else
  {
    if($_FILES['pix']['tmp_name'] == "none")
    {
      echo "<b>File did not successfully upload. Check the
            file size. File must be less than 500K.<br>";
      include("picform.php");
      exit();
    }
if(file_has_extension($_FILES['pix']['name'], $image_extensions))
    {
      echo "<b>File is not a picture. Please try another
            file.</b><br>";
      include("picform.php");
      exit();
    }
    else
    {
      $destination = $_FILES['pix']['name'];
      $destination = strtolower($destination);
      $temp_file = $_FILES['pix']['tmp_name'];
if (file_exists($destination) and $_POST['Overwrite']!="Overwrite") {
    echo "The file $destination already exists.";exit();
}
#########
      move_uploaded_file($temp_file,$destination);
      echo "<p><b>The file has successfully uploaded:</b>
            {$destination}
            ({$_FILES['pix']['size']})</p>";

$img="http://www.animeviews.com/images/$destination";

$img    = $destination;
$width  = "180px";
$height = "";

// Get new dimensions
list($width1, $height1) = getimagesize($img);
if ($width =="") {$j=$height/$height1; $width  = $width1  * $j;}
if ($height=="") {$j=$width/$width1;  $height = $height1 * $j;}
$new_width = $width;
$new_height = $height;

// Resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($img);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width1, $height1);

// Output
$img=preg_replace('/h.*\//','',$img);
$img=strtolower($img);
$dest="thumbs/$img";
imagejpeg($image_p,$dest);

    }
  }
?>

---

It appears that I need to make changes to the following lines:

Code:

---

function file_has_extension($fn, $ext) {
  if(is_array($ext))
    return array_reduce(array_map(create_function('$a', 'return file_has_extension(\'' . $fn . '\', $a);'), $ext), 'or_f', false);
  else
    return stripos($fn, '.' . strtolower($ext)) === strlen($fn) - strlen($ext) + 1;
}

---

I am trying to follow the advice from the following blog post: Function create_function() is Deprecated in PHP 7.2 - How to Migrate?

Here is a simpler example given from the article:

Code:

---

$callback = create_function('$matches', "return strtolower(\$matches[1]);");

---

is refactored into:

Code:

---

$callback = function ($matches) {
    return strtolower($matches[1]);
};

---

My research into this continues...

Resolved:

The purpose was to make sure that only images are uploaded, so create_function() or function() are not really needed. In fact, all I really needed was the following code snippet:

Code:

---

$end=substr($_FILES['pix']['type'], 0, 6);
$end=strtolower($end);

---

In short, the following code will check to see if the image being uploaded is an image. Not displayed is the code to be sure the user of the script is me. The script will overwrite the image if the same filename already exists and Overwrite was selected. A thumbnail is created and, lastly, a message is displayed saying that the file was successfully uploaded with the size.

Here is the full code:

Code:

---

<?php
$end=substr($_FILES['pix']['type'], 0, 6);
$end=strtolower($end);
if($end=="image/") {}
else {echo"<script type=\"text/javascript\">
 window.location = \"http://www.animeviews.com/images/picform.php\"
 </script>";
exit;
}
  if(!isset($_POST['Upload']) and !isset($_POST['Overwrite']))
  {
    include("picform.php");
  } # endif
  else
  {
    if($_FILES['pix']['tmp_name'] == "none")
    {
      echo "<b>File did not successfully upload. Check the
            file size. File must be less than 500K.<br>";
      include("picform.php");
      exit();
    }

      $destination = $_FILES['pix']['name'];
      $destination = strtolower($destination);
      $temp_file = $_FILES['pix']['tmp_name'];
if (file_exists($destination) and $_POST['Overwrite']!="Overwrite") {
    echo "The file $destination already exists.";exit();
}
#########
      move_uploaded_file($temp_file,$destination);
      echo "<p><b>The file has successfully uploaded:</b>
            {$destination}
            ({$_FILES['pix']['size']})</p>";

$img="http://www.animeviews.com/images/$destination";

$img    = $destination;
$width  = "180";
##$height = "";

// Get new dimensions
list($width1, $height1) = getimagesize($img);
if (!isset($width)) {$j=$height/$height1; $width  = $width1  * $j;}
if (!isset($height)) {$j=$width/$width1;  $height = $height1 * $j;}
$new_width = $width;
$new_height = $height;

// Resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($img);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width1, $height1);

// Output
$img=preg_replace('/h.*\//','',$img);
$img=strtolower($img);
$dest="thumbs/$img";
imagejpeg($image_p,$dest);
  }

---