Replace variables from text with corresponding values - php

Question

Let say I have the following string which I want to send as an email to a customer.
"Hello Mr/Mrs {{Name}}. You have subscribed for {{Service}} at {{Date}}."
And I have an array with the values that should be replaced
array(
'Name' => $customerName, //or string
'Service' => $serviceName, //or string
'Date' => '2015-06-06'
);
I can find all strings between {{..}} with this:
preg_match_all('/\{{(.*?)\}}/',$a,$match);
where $match is an array with values, But I need to replace every match with a corresponding value from an array with values
Note that the array with values contains a lot more values and the number of items in it or the keys sequence is not relevant to number of matches in string.

Answer 1

You can use preg_replace_callback and pass the array with the help of use to the callback function:
$s = "Hello Mr/Mrs {{Name}}. You have subscribed for {{Service}} at {{Date}} {{I_DONT_KNOW_IT}}.";
$arr = array(
'Name' => "customerName", //or string
'Service' => "serviceName", //or string
'Date' => '2015-06-06'
);
echo $res = preg_replace_callback('/{{(.*?)}}/', function($m) use ($arr) {
return isset($arr[$m[1]]) ? $arr[$m[1]] : $m[0]; // If the key is uknown, just use the match value
}, $s);
// => Hello Mr/Mrs customerName. You have subscribed for serviceName at 2015-06-06.
See IDEONE demo.
The $m[1] refers to what has been captured by the (.*?). I guess this pattern is sufficient for the current scenario (does not need unrolling as the strings it matches are relatively short).

Answer 2

You don't need to use a regex for that, you can do it with a simple replacement function if you change a little the array keys:
$corr = array(
'Name' => $customerName, //or string
'Service' => $serviceName, //or string
'Date' => '2015-06-06'
);
$new_keys = array_map(function($i) { return '{{' . $i . '}}';}, array_keys($corr));
$trans = array_combine($new_keys, $corr);
$result = strtr($yourstring, $trans);

Answer 3

Try
<?php
$str = "Hello Mr/Mrs {{Name}}. You have subscribed for {{Service}} at {{Date}}.";
$arr = array(
'Name' => 'some Cust', //or string
'Service' => 'Some Service', //or string
'Date' => '2015-06-06'
);
$replaceKeys = array_map(
function ($el) {
return "{{{$el}}}";
},
array_keys($arr)
);
$str = str_replace($replaceKeys, array_values($arr), $str);
echo $str;