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I have recently started PHP and Mysql project development on Ubuntu. In one part of the project I need to upload files. But my script is not uploading anything larger than 1 MB nor does it show any error. Smaller files are uploading fine. So I think my script is ok. Besides I have made suitable changes in both php.ini and my.cnf files. Can someone please tell me other possible reasons for this?

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You can do it in 2 ways, by editing the php.ini file or using .htaccess

If you edit the php.ini file which is located in /etc/php5/apache2/php.ini

Find the value that says upload_max_filesize and change it to the value you wish, for example here I have a max upload file size of 100M

upload_max_filesize = 100M

Now you also need to edit the post_max_size that PHP will work with through POST, for that we edit the value to whatever you want, I recommend same as upload:

post_max_size = 100M

In the case you wish to do it with .htaccess, simply create this file in the root folder of you web site and add the following lines:

<IfModule mod_php5.c>
    php_value upload_max_filesize 100M
    php_value post_max_size 100M
</IfModule>

Note that .htaccess does not work 100% of the time because it depends on Server settings. On your localhost it will work perfectly but if you are hosting on a shared site or an external address, the server might have limits to the max size that can be uploaded.

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To show errors in PHP, edit your php.ini file and change:

display_errors = on

Restart your apache server.

Then in your project config.php file (if you have one), add these lines:

/* errors handling */
error_reporting(E_ALL);
ini_set("display_errors",1);
ini_set('log_errors',0);
ini_set('error_log','path/to/log/file');

During development, set display_errors=1 and log_errors=0.
When deployed, change display_errors=0 and log_errors=1.

Then just be periodically checking your log file for any logged errors.

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