<?php
$meses = 3;
$valor = 1000;
$boletos = [];
for ($i = 1; $i <= $meses; $i++) array_push($boletos, round($valor / $meses, 0)); $boletos[$meses - 1] += $valor - array_sum($boletos);
//https://pt.stackoverflow.com/q/403984/101
PD9waHAKJG1lc2VzID0gMzsKJHZhbG9yID0gMTAwMDsKJGJvbGV0b3MgPSBbXTsKZm9yICgkaSA9IDE7ICRpIDw9ICRtZXNlczsgJGkrKykgYXJyYXlfcHVzaCgkYm9sZXRvcywgcm91bmQoJHZhbG9yIC8gJG1lc2VzLCAwKSk7CiRib2xldG9zWyRtZXNlcyAtIDFdICs9ICR2YWxvciAtIGFycmF5X3N1bSgkYm9sZXRvcyk7CnByaW50X3IoJGJvbGV0b3MpOwoKLy9odHRwczovL3B0LnN0YWNrb3ZlcmZsb3cuY29tL3EvNDAzOTg0LzEwMQ==