Top "Undefined-function" questions

An undefined function is a function that fails to execute when called due to the body of the function not being available to the program, compiler, or interpreter, looking for a function definition.

Undefined function mysql_connect()

I have ran aptitude install php5-mysql (and restarted MySQL/Apache 2), but I am still getting this error: Fatal error: …

php mysql ubuntu mysql-connect undefined-function
PHP fileinfo is undefined function

Whenever I try to get the mime content type from php, it echos: Fatal error: Class 'finfo' not found in /…

php mime-types undefined-function
Call to undefined function password_hash()

I am running php version 5.4.16 on localhost right now, while I am developing my site. I want to use password_…

php password-encryption password-hash php-password-hash undefined-function
pcntl_fork() returning, Fatal error: Call to undefined function pcntl_fork()

I'm trying to fork a command line run XAMPP php process using pcntl_fork(). When I run the command below: $…

php fork command-line-interface pcntl undefined-function
Laravel: Call to undefined function Symfony\Component\Console\mb_convert_variables()?

I'm running a vanilla Amazon EC2 server. I installed PHP 5.5.21 myself. My web application is built on Laravel. For weeks, …

php linux laravel amazon-ec2 undefined-function
Uncaught TypeError: undefined is not a function (jQuery & jQuery UI)

I am trying to use the jQuery UI autocomplete widget but I'm getting the following error in Google Chrome: Uncaught …

jquery jquery-ui undefined-function typeerror
Undefined function or method xxx for input arguments of type 'double'

So I looked around to figure out what causes this error, and people keep on listing the culprit being matlab …

matlab arguments double undefined-function