My function is not getting the expected return

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I have the following function:

function qa($array = array()) {
    $a = $array;
    $sequencias = [];
    $ultima_seq = 0;

    for ($i = 0; $i < count($a)-1; ++$i) {
        if (($a[$i+1]-$a[$i]) == 1) {
            if (isset($sequencias[$ultima_seq])) {
                $sequencias[$ultima_seq][] = $a[$i+1];
            } else {
                $sequencias[$ultima_seq][0] = $a[$i];
                $sequencias[$ultima_seq][1] = $a[$i+1];
            }
        } else {
            $ultima_seq++;
        }
    }
    $total_sequencia = count($sequencias);
    return $total_sequencia;
}

It counts the numeric sequence blocks of an array, for example:

$a = array(1,2,4,5,7,8);
$b = array(10,11,12,15,16,20,21,22,30,31,32);
  • In $to we have 3 sequences blocks (1,2 - 4,5 - 7,8);
  • In $b we have 4 sequences blocks (10,11,12 - 15,16 - 20,21,22 - 30,31,32);

For example, we will use the following array`s:

$a_1 = array(1,2,3,4,5,6,7,8,9,10,11,12,13,15,16,17,18,19,20,21);
$a_1_copia = array(01,02,03,04,05,06,07,08,09,10,11,12,13,15,16,17,18,19,20,21);
$a_2 = array(1,2,3,4,5,6,7,8,9,10,11,12,14,15,16,17,18,19,20,21);
$a_2_copia = array(01,02,03,04,05,06,07,08,09,10,11,12,14,15,16,17,18,19,20,21);
$a_3 = array(1,2,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21);
$a_3_copia = array(01,02,04,05,06,07,08,09,10,11,12,13,14,15,16,17,18,19,20,21);

The feedback I’m getting is this::

print_r(qa($a_1)); // 2
print_r(qa($a_1_copia)); // 3
print_r(qa($a_2)); // 2
print_r(qa($a_2_copia)); // 3
print_r(qa($a_3)); // 2
print_r(qa($a_3_copia)); // 3

However, all array’s have sequence 2. Those who are returning me 3 are like this if I use 0 (zero) in its tens.

I’ve broken my head, but I’m missing something. Where I’m going wrong here?

php

  • Is the goal to count the number of sequences contained in an array? Because some arrays have numbers starting at 0, as an example (01,02,... ?

  • @Isac the goal is to count the amount of blocks sequences, as I explained above. Some arrays have 0 because I put to show the mistake I’m having.

  • Your code seems correct to me, except for the zeros on the left. See here the result

  • @Isac the code works perfectly when the array does not have 0 left. But the question is exactly this, how could it function properly when there is also 0 to the left?

  • 3

    For the simple fact that when a number has zero on the left PHP will consider it as base 8, an octal. Being octal, the values 08 and 09 nor would they be valid numbers for PHP 7+; if it is already running in previous versions, PHP converts them to zero (because for PHP this makes sense).

  • I don’t understand why zeroes. Why do you have zeros? You’re interpreting from text ? If so, you should use intval to interpret the string as an integer that alone solves the problem

  • for is like ++$i , it shouldn’t be $i++ ?

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