Split array and sort

In the most elegant way possible, let's go to the solution:

Your array is as follows:

$dados = array(
    'Ato001_1981',
    'Ato002_1980',
    'Ato003_1982',
    'Ato003_1983',
    'Ato004_1982',
    'Ato013_1981',
    'Ato013_1982',
    'Ato013_1988',
    'Ato031_1982',
    'Ato032_1979',
    'Ato039_1988',
    'Ato060_1987',
    'Ato065_1988',
    'Ato066_1988',
    'Ato067_1988',
    'Ato076_1987',
    'Ato077_1988',
    'Ato078_1988',
    'Ato095_1987',
    'Ato137_1987',
    'Ato144_1987'
);

First let's turn this array . I think the most appropriate function for this is to use array_map , for protecting the scope of the variable and its own functionality for generating arrays based on others.

$array = array_map(function ($value){
    return explode('_', $value);
}, $dados);

Subsequently we will use usort , which compares the values of array , through a callback, in order to sort it.

usort($array, function ($v1, $v2)
{
    $diff = $v2[1] - $v1[1];

    if ($diff) return $diff;

    return strcmp($v2[0], $v1[0]);

});

Finally, we have array - obtained with var_export .

array (
  0 => 
  array (
    0 => 'Ato078',
    1 => '1988',
  ),
  1 => 
  array (
    0 => 'Ato077',
    1 => '1988',
  ),
  2 => 
  array (
    0 => 'Ato067',
    1 => '1988',
  ),
  3 => 
  array (
    0 => 'Ato066',
    1 => '1988',
  ),
  4 => 
  array (
    0 => 'Ato065',
    1 => '1988',
  ),
  5 => 
  array (
    0 => 'Ato039',
    1 => '1988',
  ),
  6 => 
  array (
    0 => 'Ato013',
    1 => '1988',
  ),
  7 => 
  array (
    0 => 'Ato144',
    1 => '1987',
  ),
  8 => 
  array (
    0 => 'Ato137',
    1 => '1987',
  ),
  9 => 
  array (
    0 => 'Ato095',
    1 => '1987',
  ),
  10 => 
  array (
    0 => 'Ato076',
    1 => '1987',
  ),
  11 => 
  array (
    0 => 'Ato060',
    1 => '1987',
  ),
  12 => 
  array (
    0 => 'Ato003',
    1 => '1983',
  ),
  13 => 
  array (
    0 => 'Ato031',
    1 => '1982',
  ),
  14 => 
  array (
    0 => 'Ato013',
    1 => '1982',
  ),
  15 => 
  array (
    0 => 'Ato004',
    1 => '1982',
  ),
  16 => 
  array (
    0 => 'Ato003',
    1 => '1982',
  ),
  17 => 
  array (
    0 => 'Ato013',
    1 => '1981',
  ),
  18 => 
  array (
    0 => 'Ato001',
    1 => '1981',
  ),
  19 => 
  array (
    0 => 'Ato002',
    1 => '1980',
  ),
  20 => 
  array (
    0 => 'Ato032',
    1 => '1979',
  ),
)

$texto = array(
    'Ato001_1981',
    'Ato002_1980',
    'Ato003_1982',
    'Ato003_1983',
    'Ato004_1982',
    'Ato013_1981',
    'Ato013_1982',
    'Ato013_1988',
    'Ato031_1982',
    'Ato032_1979',
    'Ato039_1988',
    'Ato060_1987',
    'Ato065_1988',
    'Ato066_1988',
    'Ato067_1988',
    'Ato076_1987',
    'Ato077_1988',
    'Ato078_1988',
    'Ato095_1987',
    'Ato137_1987',
    'Ato144_1987'
);

$new = array();
foreach($texto as $item):
    $valor = explode('_', $item);
    $new = ['ano' => $valor[1], 'tipo' => $valor[0]];

    echo $new['ano'] . '  ' . $new['tipo'] . '<br />';
endforeach;

Here it worked like this.

The least bad way to sort the array based on the key is to use usort ()

function cmp($a, $b) {
    return $a["ano"] < $b["ano"];
}


$texto = ['Ato001_1981','Ato002_1980','Ato003_1982','Ato003_1983','Ato004_1982','Ato013_1981'];

$new = array();
$index  = 0;
foreach($texto as $item){
    $valor = explode('_', $item);
    $new[$index]['tipo'] = $valor[0];
    $new[$index]['ano'] = $valor[1];
    $index++;
}

usort($new, "cmp");

echo '<pre>';
print_r($new);

Reference: SOen - Sort php multidimensional array by sub-value