Install mcrypt PHP extension on macOS

install_php_mcrypt.sh

#!/bin/bash

# Install Xcode Command-Line Tools first (required)
xcode-select --install

# Check PHP version
PHP_VER=$(php -v | head -1 | awk '{ print $2 }')

# Extensions directory (default: empty string)
EXT_DIR=""

# El Capitan / Sierra workaround
if [ $(uname -r | head -c2) > 14 ]; then
  EXT_DIR=/usr/local/lib/php/extensions/
  mkdir -p $EXT_DIR
fi

# First, check if extension is already installed
php -m | grep mcrypt

# Update brew and install requirements
brew update
brew install autoconf

# Download PHP source and extract
cd /tmp
curl -O http://php.net/distributions/php-$PHP_VER.tar.bz2
tar -xjf php-$PHP_VER.tar.bz2

# Go to extension dir and compile
cd /tmp/php-$PHP_VER/ext/mcrypt/
phpize
./configure
make

# El Capitan / Sierra workaround
if [ $(uname -r | head -c2) > 14 ]; then
  cp ./modules/mcrypt.so $EXT_DIR
else
  sudo make install
fi
echo "extension=${EXT_DIR}mcrypt.so" | sudo tee -a /private/etc/php.ini

# Check if extension is installed
php -m | grep mcrypt

# Cleanup
rm -rf /tmp/php-*