Php code to create thumb not working after update - php

Question

The following php script creates a thumb and is part of an image gallery package. Though since a php update to version 5.6, the code doesn't work anymore because the appearance of 'eregi' in a dependent file.
Does anyone knows an alternative function for 'eregi'?
<?php
include('config.inc.php');
$C_JGALL['extentions'] = "jpg|jpeg|gif|png";
if(is_dir('themes/' . $C_JGALL['gall_theme']) && file_exists('themes/' .$C_JGALL['gall_theme'] . '/' . $C_JGALL['gall_theme'] . '.css') && file_exists('themes/' . $C_JGALL['gall_theme'] . '/' . $C_JGALL['gall_theme'] . '.conf.php'))
{
include('themes/' . $C_JGALL['gall_theme'] . '/' . $C_JGALL['gall_theme'] . '.conf.php');
}
else
{
die('corrupt theme');
}
$MaxSize = $_GET['MaxSize'];
switch ($_GET['src']) {
case 'folder':
$src = $G_JGALL['inc_path'] . 'themes/' . $C_JGALL['gall_theme'] . '/images/folder.jpg';
break;
case 'question':
$src = $G_JGALL['inc_path'] . 'themes/' . $C_JGALL['gall_theme'] . '/images/no_image.jpg';
break;
default:
$src= $_GET['src'];
break;
}
function GetExtention($filename) {
$FileNameArray = explode('.',$filename);
return($FileNameArray[count($FileNameArray)-1]);
}
$ext = GetExtention($src);
$srcSize = getImageSize($src);
$srcRatio = $srcSize[0]/$srcSize[1];
$destRatio = $MaxSize/$MaxSize;
if ($destRatio > $srcRatio) {
$MaxSize = (($C_JGALL['gall_show_filenames'] != 'y') OR isset($_GET['view'])) ? $MaxSize : $MaxSize / 100 * 80;
$destSize[1] = $MaxSize;
$destSize[0] = $MaxSize*$srcRatio;
}
else {
$destSize[0] = $MaxSize;
$destSize[1] = $MaxSize/$srcRatio;
}
if(eregi($C_JGALL['extentions'],$ext) AND (substr($srcSize['mime'],0,5) == 'image'))
if(eregi("jpg|jpeg",$ext)) {
$destImage = imagecreatetruecolor($destSize[0],$destSize[1]);
$srcImage = imagecreatefromjpeg($src);
imagecopyresampled($destImage, $srcImage, 0, 0, 0, 0,$destSize[0],$destSize[1],$srcSize[0],$srcSize[1]);
imagejpeg($destImage,'',80);
}
elseif(eregi("gif",$ext)) {
$destImage = imageCreateTrueColor($destSize[0],$destSize[1]);
$srcImage = imageCreateFromGIF($src);
imageCopyResampled($destImage, $srcImage, 0, 0, 0, 0,$destSize[0],$destSize[1],$srcSize[0],$srcSize[1]);
imageGIF($destImage,'',80);
}
elseif(eregi("png",$ext)) {
$destImage = imageCreateTrueColor($destSize[0],$destSize[1]);
$srcImage = imageCreateFromPNG($src);
imageCopyResampled($destImage, $srcImage, 0, 0, 0, 0,$destSize[0],$destSize[1],$srcSize[0],$srcSize[1]);
imagePNG($destImage,'',80);
}
else {
die('ongeldige extentie of mime-type.');
}
// --> End
?>

Answer 1

I would look at the PHP Documentation, as you have identified already the function has been deprecated. They do however make a recommendation to replace it;
http://php.net/manual/en/function.eregi.php
TIP eregi() is deprecated as of PHP 5.3.0. preg_match() with the i (PCRE_CASELESS) modifier is the suggested alternative.