<?php
 
// SET OUR DEFAULTS
$var["blue"]="ocean";
$var["red"]="fire";
$var["green"]="forest";
 
$string = 'people loves {{blue}} looks {{red}} and enjoy {{green}}';
 
 
// MAKE A CALLBACK FUNCTION THAT WILL REPLACE THE APPROPRIATE VALUES
$callback_function = function($m) use ($var) {
    return $var[$m[2]];
};
 
 
// RUN THE PREG_REPLACE_CALLBACK - CALLING THE FUNCTION
$string = preg_replace_callback('~(\{\{(.*?)\}\})~', $callback_function, $string);
 
 
// DYNAMITE
print $string;
 

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