这个页面会导致内存泄漏吗

我在下面有一个页面，它为用户加载了一个图像，url看起来像someurl/page.php？路径=.jpg当人们访问这个页面时，我发现内存使用量增加得很快我不确定这个页面是否会导致内存泄漏

 <?php
    $tar_path=urldecode($_GET['path']); 
    $strs=preg_split("/'./",$tar_path); 
    $small_name = $strs[0].'_small.'.$strs[1]; 
    header('Content-type: image/jpeg'); 
    if(file_exists($small_name))
    {
        $PSize = filesize($small_name );
        $picturedata = fread(fopen($small_name, "r"), $PSize);
        echo $picturedata;
    }else
    {
        $im = imagecreatefromjpeg($tar_path);  
        $maxwidth = 150;  
        $maxheight = 0; 
        $pic_width = imagesx($im);  
        $pic_height = imagesy($im);  

        $widthratio = $maxwidth/$pic_width;  
        $resizewidth_tag = true;  

        $ratio = $widthratio;  
        $newwidth = $pic_width * $ratio;             
        $newheight = $pic_height * $ratio;         
        if(function_exists("imagecopyresampled"))  
        {  
            $newim = imagecreatetruecolor($newwidth,$newheight);   
            imagecopyresampled($newim,$im,0,0,0,0,$newwidth,$newheight,$pic_width,$pic_height);   
        }  
        else  
        {  
            $newim = imagecreate($newwidth,$newheight);  
            imagecopyresized($newim,$im,0,0,0,0,$newwidth,$newheight,$pic_width,$pic_height);  
        }  
        imagejpeg($newim,$small_name);  
        imagedestroy($newim);  
        imagedestroy($im);
        $PSize = filesize($small_name );
        $picturedata = fread(fopen($small_name, "r"), $PSize);
        echo $picturedata;
    }         
    ?>