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I was getting the following error when trying to run composer update on a SimpleSAML project.
- openid/php-openid dev-master requires ext-gmp * -> the requested PHP extension gmp is missing from your system. Running sudo apt-get install php5-gmp did not work and neither did sudo apt-get install php7-gmp
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GMP stands for GNU Multiple Precision Arithmetic Library (GMP). GMP is a library supported in PHP that allows you to do mathematical operations on signed integers, rational numbers, and floating point numbers. GMP has a rich collection of functions that helps to perform complex mathematical operations on big numbers.
To install GMP for PHP7.0 on Ubuntu, run: sudo apt-get install php7.0-gmp
Make sure your php.ini contains the following: extension=php_gmp.so
To find out where your php.ini is located, run: php --ini
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