PHP Fatal error: Call to undefined function json_decode()

问题:

Apache is logging PHP Fatal error: Call to undefined function json_decode(). After some googling, it seems this problem is a result of not having the latest version of php. Oddly, running php --version ouputs

PHP 5.5.1-2+debphp.org~precise+2 (cli) (built: Aug  6 2013 10:49:43)  Copyright (c) 1997-2013 The PHP Group Zend Engine v2.5.0, Copyright (c) 1998-2013 Zend Technologies     with Zend OPcache v7.0.2-dev, Copyright (c) 1999-2013, by Zend Technologies     with Xdebug v2.2.3, Copyright (c) 2002-2013, by Derick Rethans 

Clearly showing that my php version is greater than 5.1.

Any ideas as to what could cause this, or the steps to take to find out?

EDIT: The result of a script echoing phpversion is 5.5.1-2+debphp.org~precise

EDIT: The result of phpinfo() is also PHP Version 5.5.1-2+debphp.org~precise+2

Furthermore, in the phpinfo(), it lists the module JSON and the module authors (Omar Kilani, Scott MacVicar).

回答1:

Using Ubuntu?

Short answer:

sudo apt-get install php7.2-json 

(or php7.1-json or php5-json depending on the PHP version you're running)

Then of course make sure you restart Apache:

sudo service apache2 restart 

Or if you are using PHP-FPM:

sudo service php7.2-fpm restart 

(Or php7.1-fpm or php5-fpm)

Explanation

Debian has removed the previous JSON extension as of PHP 5.5rc2 due to a license conflict.

The JSON license has a clause which states:

The Software shall be used for Good, not Evil.

This causes a problem with Free Software Foundation's definition of free software which states:

The freedom to run the program, for any purpose (freedom 0).

FSF goes on to specifically list the JSON license as nonfree.

Yes it seems a bit silly. Nevertheless Debian has removed the non-compliant JSON extension, and instead offered a replacement extension that is functionally equivalent.

To be clear: PHP itself has NOT removed JSON, it's still in master. This is a distro / package manager issue.

Rasmus makes it pretty clear:

We have not removed json and we will never release a version of php without json support built in. Any changes in 5.5 is due to whatever distro packaging you are using which we have no control over.

More details

http://iteration99.com/2013/php-json-licensing-and-php-5-5/

http://liorkaplan.wordpress.com/2013/06/01/bye-bye-non-free-php-json-extension/

https://bugs.php.net/bug.php?id=63520

http://philsturgeon.co.uk/blog/2013/08/fud-cracker-php-55-never-lost-json-support

回答2:

With Ubuntu :

sudo apt-get install php5-json sudo service php5-fpm restart 

回答3:

Solution for LAMP users:

apt-get install php5-json service apache2 restart 

Source

回答4:

The module was install but symbolic link was not in /etc/php5/cli/conf.d

回答5:

The same issue with 7.1

apt-get install php7.1-json sudo nano /etc/php/7.1/mods-available/json.ini

• Add json.so to the new file
• Add the appropriate sym link under conf.d
• Restart apache2 service (if needed)

回答6:

If you're using phpbrew try to install json extension to fix error with undefined function json_decode():

phpbrew ext install json 

回答7:

I have the same question: PHP Fatal error: Call to undefined function json_decode(), but I run php under cygwin on Windows. When I run php -m, I found that there is no json module installed. So I run cygwin setup.exe again, check json package from the configuration interface, and the problem is solved.

回答8:

you might also consider avoiding the core PHP module altogether.

It is quite common to use the guzzle json tools as a library in PHP apps these days. If your app is a composer app, it is trivial to include them as a part of a composer build. The guzzle tool, as a library, would be a turnkey replacement for the json tool, if you tell PHP to autoinclude the tool.

http://docs.guzzlephp.org/en/stable/search.html?q=json_encode#

http://apigen.juzna.cz/doc/guzzle/guzzle/function-GuzzleHttp.json_decode.html

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