<?php
function resize ($filename, $size)
{
$pref = 'mini_' ;
$img = strtolower(strrchr(basename($filename), "." ));
$imgname = basename($filename);
$formats = array ('.jpg' ,
'.gif' , '.png' , '.bmp' );
if (in_array($img, $formats))
{
list($width, $height) = getimagesize($filename);
$new_height = $height * $size;
$new_width = $new_height / $width;
$thumb = imagecreatetruecolor($size, $new_width);
switch ($img)
{
case '.jpg' : $source = @imagecreatefromjpeg($filename); break ;
//создаем превьюшки
case '.gif' : $source = @imagecreatefromgif($filename); break ;
case '.png' : $source = @imagecreatefrompng($filename); break ;
case '.bmp' : $source = @imagecreatefromwbmp($filename); break ;
}
imagecopyresized($thumb, $source, 0 , 0, 0, 0, $size, $new_width, $width, $height);
switch ($img)
{
case '.jpg' : imagejpeg($thumb, $pref.$imgname);
break ;
case '.gif' : imagegif($thumb, $pref.$imgname);
break ;
case '.png' : imagepng($thumb, $pref.$imgname);
break ;
case '.bmp' : imagewbmp($thumb, $pref.$imgname);
break ;
}
}
else return 'Error' ;
@imagedestroy($thumb);
@imagedestroy($source);
return $imgname;
}
?>

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