<?php
$text = '[["42","o","1gb","b","mtnsme","n","230"],["43","o","2gb","b","mtnsme","n","460"],["44","o","3gb","b","mtnsme","n","690"],["45","o","5gb","b","mtnsme","n","1150"]]';
$replacements = [
'[["' => "",
'["' => "",
'","o","' => " 👉 ",
'","b","' => " ",
'","n","' => " ₦",
'"],' => "\n\n",
'"]]' => "\n",
];
echo strtr($text, $replacements);
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