imagecreatefromjpeg and similar functions are not working in PHP

Question

I’ve searched for this and the solutions provided in past questions are completely incomprehensible to me. Whenever I run functions like imagecreatefromjpeg, I

Answer 1

In Ubuntu/Mint (Debian based)

$ sudo apt-get install php5-gd

Answer 2

after
systemctl restart php-fpm
the Gd library works.

Answer 3

For php 7 on Ubuntu:

sudo apt-get install php7.0-gd

Answer 4

As mentioned before, you might need GD library installed.

On a shell, check your php version first:
php -v

Then install accordingly. In my system (Linux-Ubuntu) it's php version 7.0:
sudo apt-get install php7.0-gd

Restart your webserver:
systemctl restart apache2

You should now have GD library installed and enabled.

Answer 5

You must enable the library GD2.

Find your (proper) php.ini file

Find the line: ;extension=php_gd2.dll and remove the semicolon in the front.

The line should look like this:

extension=php_gd2.dll

Then restart apache and you should be good to go.

Answer 6

You can still get Fatal error: Call to undefined function imagecreatefromjpeg() even if GD is installed.

The solution is to install/enable jped lib:

On Ubuntu:

    apt-get install libjpeg-dev
    apt-get install libfreetype6-dev

On CentOS:

    yum install libjpeg-devel
    yum install freetype-devel

If compiling from source add --with-jpeg-dir --with-freetype-dir or --with-jpeg-dir=/usr --with-freetype-dir=/usr.

For more details check https://www.tectut.com/2015/10/solved-call-to-undefined-function-imagecreatefromjpeg/