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Setting up a new headless Raspberry Pi from Scratch : A Quickstart Guide

Note : These instructions have been tested for the Raspberry Pi 3B+ and Raspberry Pi 4B. You can try these on older versions, but I have no guarantee that these instructions will work correctly.

Enabling SSH before the first boot of the Raspberry Pi

To enable SSH in your Raspberry pi before actually booting it up, simply create a file named ssh (with no extension) in the boot partition of your card.

Ref : https://www.raspberrypi.org/documentation/configuration/wireless/headless.md

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/**
 * Flatten a multi dimension array. For an associative array the child keys are separated by underscore(_) (overwrittable).
 *
 * Function taken and tweaked from https://gist.github.com/mmohiudd/7474896
 * @author Muntasir Mohiuddin
 * @param array $a multidimensional array to flatten
 * @param array &$r multidimensional array to save values
 * @param string $s separator to use between parent and children keys
 * @param string $p previous parents separated by the separator
 * @return array all flattened keys

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https://xdebug.org/wizard.php