How to set limit for video file size upload

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PHP

MySQL

Hi, i have a webapp that allows users to upload video to server for sharing, but inorder to minimize storage usage i want to set a limi to video file size upload per user.
But when i added a code snippet for the modification after saving and refreshing the page it goes blank i.e it does not show anything on the UI for uploading.
See the code below


if ($_POST['video_type']=='local')
{

$maxsize = 5242880; // 5MB

// Check file size
if(($_FILES['file']['size'] >= $maxsize) || ($_FILES["file"]["size"] == 0)) {
echo "File too large. File must be less than 5MB.";
}else{
// Upload
$file_path = 'http://'.$_SERVER['SERVER_NAME'] . dirname($_SERVER['REQUEST_URI']).'/uploads/';
echo "Upload successfully.";
}
}

/* $file_path = 'http://'.$_SERVER['SERVER_NAME'] . dirname($_SERVER['REQUEST_URI']).'/uploads/'; */

$video_url=$file_path.$_POST['video_file_name'];

$file_name= str_replace(" ","-",$_FILES['video_thumbnail']['name']);

$video_thumbnail=rand(0,99999)."_".$file_name;

//Main Image
$tpath1='images/'.$video_thumbnail;
$pic1=compress_image($_FILES["video_thumbnail"]["tmp_name"], $tpath1, 80);

//Thumb Image
$thumbpath='images/thumbs/'.$video_thumbnail;
$thumb_pic1=create_thumb_image($tpath1,$thumbpath,'200','200');

$video_id='';
}

Kindly help

What I have tried:

I tried searching on google and asking on developer fussion