<?php
$valor = 15840;
$faixas = [
[5000, .41],
[10000, .42],
[15000, .43],
[20000, .44],
[25000, .5],
[30000, .57]
];
if($valor > end($faixas)[0] || $valor < 1){ $porcentagem = 5;
}else{
foreach($faixas as $v){
if($valor <= $v[0]){
$porcentagem = $v[1];
break;
}
}
}
echo $porcentagem;
PD9waHAKCiR2YWxvciA9IDE1ODQwOwoKJGZhaXhhcyA9IFsKICAgWzUwMDAsIC40MV0sCiAgIFsxMDAwMCwgLjQyXSwKICAgWzE1MDAwLCAuNDNdLAogICBbMjAwMDAsIC40NF0sCiAgIFsyNTAwMCwgLjVdLAogICBbMzAwMDAsIC41N10KXTsKCmlmKCR2YWxvciA+IGVuZCgkZmFpeGFzKVswXSB8fCAkdmFsb3IgPCAxKXsKICAgJHBvcmNlbnRhZ2VtID0gNTsKfWVsc2V7CiAgIGZvcmVhY2goJGZhaXhhcyBhcyAkdil7CiAgICAgIGlmKCR2YWxvciA8PSAkdlswXSl7CiAgICAgICAgICRwb3JjZW50YWdlbSA9ICR2WzFdOwogICAgICAgICBicmVhazsKICAgICAgfQogICB9Cn0KCmVjaG8gJHBvcmNlbnRhZ2VtOw==