charles.sh

#!/bin/bash
# Usage:
# ./charles.sh on
# ./charles.sh off

# sed needs write permissions to the parent folder to create temp file
sudo chmod -R 777 /usr/share/php/Zend/Http/Client/Adapter
sudo chmod -R 777 /usr/share/php/BBC/Http/Multi/Client/Adapter/

if [ $1 = "on" ]; then
  charles_ip=$(netstat -rn | grep "^0.0.0.0 " | cut -d " " -f10)
  echo "Adding Charles proxy to Curl & Multi Curl adapters, IP set to $charles_ip"
  charles_proxy="\$ch = isset(\$curlHandle) ? \$curlHandle : \$this->_curl;curl_setopt(\$ch, CURLOPT_PROXY, '"$charles_ip"'); curl_setopt(\$ch, CURLOPT_PROXYPORT, 8888); curl_setopt(\$ch, CURLOPT_SSL_VERIFYPEER, 0);//charles"
  sed -i  "/curl_exec/i\ $charles_proxy" /usr/share/php/Zend/Http/Client/Adapter/Curl.php
  sed -i  "/setResource/i\ $charles_proxy" /usr/share/php/BBC/Http/Multi/Client/Adapter/CurlMulti.php
else
  echo "Removing Charles Proxy"
  sed -i '/charles/d' /usr/share/php/Zend/Http/Client/Adapter/Curl.php
  sed -i '/charles/d' /usr/share/php/BBC/Http/Multi/Client/Adapter/CurlMulti.php
fi

If you get Handshake alert: unrecognized_name error for SSL calls:

sudo vi /Applications/Charles.app/Contents/Info.plist
Within JVMOptions add:
-Djsse.enableSNIExtension=false

from: http://stackoverflow.com/questions/15725118/handshake-alert-unrecognized-name-error