Php – Change the maximum upload file size

Each YouTube video has four generated images. They are predictably formatted as follows:

https://img.youtube.com/vi/<insert-youtube-video-id-here>/0.jpg
https://img.youtube.com/vi/<insert-youtube-video-id-here>/1.jpg
https://img.youtube.com/vi/<insert-youtube-video-id-here>/2.jpg
https://img.youtube.com/vi/<insert-youtube-video-id-here>/3.jpg

The first one in the list is a full size image and others are thumbnail images. The default thumbnail image (i.e., one of 1.jpg, 2.jpg, 3.jpg) is:

https://img.youtube.com/vi/<insert-youtube-video-id-here>/default.jpg

For the high quality version of the thumbnail use a URL similar to this:

https://img.youtube.com/vi/<insert-youtube-video-id-here>/hqdefault.jpg

There is also a medium quality version of the thumbnail, using a URL similar to the HQ:

https://img.youtube.com/vi/<insert-youtube-video-id-here>/mqdefault.jpg

For the standard definition version of the thumbnail, use a URL similar to this:

https://img.youtube.com/vi/<insert-youtube-video-id-here>/sddefault.jpg

For the maximum resolution version of the thumbnail use a URL similar to this:

https://img.youtube.com/vi/<insert-youtube-video-id-here>/maxresdefault.jpg

All of the above URLs are available over HTTP too. Additionally, the slightly shorter hostname i3.ytimg.com works in place of img.youtube.com in the example URLs above.

Alternatively, you can use the YouTube Data API (v3) to get thumbnail images.

There are multiple settings that can affect the maximum file upload size:

PHP_INI_PERDIR: The following settings can be set in php.ini, .htaccess or httpd.conf:

upload_max_filesize
The maximum size of an uploaded file.

post_max_size
Sets maximum size of post data allowed. To upload large files, this value must be larger than upload_max_filesize. If memory limit is enabled by your configure script, memory_limit also affects file uploading.

max_input_time
This sets the maximum time in seconds a script is allowed to parse input data, like POST, GET and file uploads.

PHP_INI_ALL: The following settings can be set in php.ini, .htaccess, httpd.conf, or with ini_set():

max_execution_time
This sets the maximum time in seconds a script is allowed to run before it is terminated by the parser. If this limit is too low, your script will terminate before a large file has had time to upload.

memory_limit
This sets the maximum amount of memory in bytes that a script is allowed to allocate. If memory limit is enabled by your configure script, memory_limit also affects file uploading. Generally speaking, memory_limit should be larger than post_max_size.

POST upload method
When uploading files via the POST method, you also need to set MAX_FILE_SIZE in your HTML form. See this for more details:

http://www.php.net/manual/en/features.file-upload.post-method.php

Shared hosting
If you are using shared hosting, it is unlikely that you will be able to access the system php.ini file. However, you can set the values in .htaccess or in a per-directory php.ini file. Some shared hosting providers may prevent you from doing this, so you will need to check if this is the case.

.htaccess
Here's a sample .htaccess file:

<IfModule mod_php5.c>
  php_value upload_max_filesize 70M
  php_value post_max_size 80M
  php_value memory_limit 90M
  php_value max_execution_time 240
  php_value max_input_time 240
</IfModule>

Per-directory php.ini
The above settings can also be changed in a per-directory php.ini file. Again, the ability to do this may be restricted by your hosting provder. For more information on this, see here:

http://www.askapache.com/php/custom-phpini-tips-and-tricks.html

Changeable:
For a description of the PHP_INI_* modes, which show where configuration directives may be set, see here:
http://php.net/manual/en/configuration.changes.modes.php