How to create thumbnail image from high memory image url in php? -

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hi friends want create thumbnail image url in php, finding 1 code generate thumb image url ,it's working low memory size image url, not working high memory size image url, please give solution problem.

<?php  // function created www.thewebhelp.com  if(!function_exists("create_square_image")){     function create_square_image($original_file, $destination_file=thumb, $square_size = 96){          if(isset($destination_file) , $destination_file!=null){             if(!is_writable($destination_file)){                 echo '<p style="color:#ff0000">oops, destination path not writable. make file or parent folder wirtable.</p>';              }         }          // width , height of original image         $imagedata = getimagesize($original_file);         $original_width = $imagedata[0];             $original_height = $imagedata[1];          if($original_width > $original_height){             $new_height = $square_size;             $new_width = $new_height*($original_width/$original_height);         }         if($original_height > $original_width){             $new_width = $square_size;             $new_height = $new_width*($original_height/$original_width);         }         if($original_height == $original_width){             $new_width = $square_size;             $new_height = $square_size;         }          $new_width = round($new_width);         $new_height = round($new_height);          // load image         if(substr_count(strtolower($original_file), ".jpg") or substr_count(strtolower($original_file), ".jpeg")){             $original_image = imagecreatefromjpeg($original_file);         }         if(substr_count(strtolower($original_file), ".gif")){             $original_image = imagecreatefromgif($original_file);         }         if(substr_count(strtolower($original_file), ".png")){             $original_image = imagecreatefrompng($original_file);         }          $smaller_image = imagecreatetruecolor($new_width, $new_height);         $square_image = imagecreatetruecolor($square_size, $square_size);          imagecopyresampled($smaller_image, $original_image, 0, 0, 0, 0, $new_width, $new_height, $original_width, $original_height);          if($new_width>$new_height){             $difference = $new_width-$new_height;             $half_difference =  round($difference/2);             imagecopyresampled($square_image, $smaller_image, 0-$half_difference+1, 0, 0, 0, $square_size+$difference, $square_size, $new_width, $new_height);         }         if($new_height>$new_width){             $difference = $new_height-$new_width;             $half_difference =  round($difference/2);             imagecopyresampled($square_image, $smaller_image, 0, 0-$half_difference+1, 0, 0, $square_size, $square_size+$difference, $new_width, $new_height);         }         if($new_height == $new_width){             imagecopyresampled($square_image, $smaller_image, 0, 0, 0, 0, $square_size, $square_size, $new_width, $new_height);         }           // if no destination file given display png               if(!$destination_file){             imagepng($square_image,null,9);         }          // save smaller image file if destination file given         if(substr_count(strtolower($destination_file), ".jpg")){             imagejpeg($square_image,$destination_file,100);         }         if(substr_count(strtolower($destination_file), ".gif")){             imagegif($square_image,$destination_file);         }         if(substr_count(strtolower($destination_file), ".png")){             imagepng($square_image,$destination_file,9);         }          imagedestroy($original_image);         imagedestroy($smaller_image);         imagedestroy($square_image);      } }    create_square_image("imageurl","thumbname.jpg",200); ?>


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