In my SLIM app I need to call external API. What is the best practice to do so? Better if I get some example 
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Use Guzzle.
Guzzle is nice, curl is another option.
Can you give me some some sample code? I search in web but nothing helpful found.
- Guzzle Documentation - Quickstart (offical docs)
- Making HTTP Requests with Guzzle (tutorial/example)
- Crash Course of Wunderlist’s API with Guzzle (tutorial/example)