file extension fiter for file upload

upload.php

//upload code
 $filename=$_FILE['name']['filename_in_html'];  //you can change this with your filename
    $allowed='png,jpg';  //which file types are allowed seperated by comma

    $extension_allowed=  explode(',', $allowed);
    $file_extension=  pathinfo($filename, PATHINFO_EXTENSION);
    if(array_search($file_extension, $extension_allowed))
    {
        echo "$extension_allowed allowed for uploading file";
    }
    else
    {
        echo "$extension_allowed is not allowed for uploading file";
    }
    //Rem $filename=$_FILE['name']['filename_in_html'];  //you can change this with your filename
    $allowed='png,jpg';  //which file types are allowed seperated by comma

    $extension_allowed=  explode(',', $allowed);
    $file_extension=  pathinfo($filename, PATHINFO_EXTENSION);
    if(array_search($file_extension, $extension_allowed))
    {
        echo "$extension_allowed allowed for uploading file";
    }
    else
    {
        echo "$extension_allowed is not allowed for uploading file";
    }