Take a regular string and convert it into a NATO Alphabet Message

NATO-Alphabet-converter.php

<?php

const NATOAlphabet = array(
	"A" => "Alfa",
	"B" => "Bravo",
	"C" => "Charlie",
	"D" => "Delta",
	"E" => "Echo",
	"F" => "Foxtrot",
	"G" => "Golf",
	"H" => "Hotel",
	"I" => "India",
	"J" => "Juliett",
	"K" => "Kilo",
	"L" => "Lima",
	"M" => "Mike",
	"N" => "November",
	"O" => "Oscar",
	"P" => "Papa",
	"Q" => "Quebec",
	"R" => "Romeo",
	"S" => "Sierra",
	"T" => "Tango",
	"U" => "Uniform",
	"V" => "Victor",
	"W" => "Whiskey",
	"X" => "X-ray",
	"Y" => "Yankee",
	"Z" => "Zulu",
	"0" => "Zero",
	"1" => "One",
	"2" => "Two",
	"3" => "Three",
	"4" => "Four",
	"5" => "Five",
	"6" => "Six",
	"7" => "Seven",
	"8" => "Eight",
	"9" => "Nine",
);

$string = "Hello this is a Test 058157";

$string = preg_replace('/\s+/', '', $string); // Removes all spaces
$string = preg_replace('/[^A-Za-z0-9\-]/', '', $string); // Removes special chars.
$string = str_split($string);

$out = "";
foreach($string as $c){
	if(!isset(NATOAlphabet[ strtoupper($c) ])){
		continue;
	}
	$out .= " ".NATOAlphabet[ strtoupper($c) ];
}

// Example Output: Hotel Echo Lima Lima Oscar Tango Hotel India Sierra India Sierra Alfa Tango Echo Sierra Tango Zero Five Eight One Five Seven
echo $out;

?>