Removing spaces from a text file

Question

How do I remove spaces from a text file? I have the following text file:

LC1 00019   1 31012012          00001                              00243206

I uploaded and put the following code:

$abrirArquivo = fopen($uploadArquivo, "r");
    while(!feof($abrirArquivo)){
        $ler = fgets($abrirArquivo,460);
        $quebrar = explode(" ",trim($ler));
        print_r($quebrar)."<br>";       
    }
    fclose($abrirArquivo);

But when I gave a print_r(), appeared that way:

Array ( [0] => LC1 [1] => 00001 [2] => [3] => [4] => 1 [5] => 31012012 [6] => [7] => [8] => [9] => [10] => [11] => [12] => [13] => [14] => [15] => 00001

Note that many keys have gone without values. How do I solve this problem?

Answer 1

To remove whitespace, use array_filter():

$abrirArquivo = fopen($uploadArquivo, "r");
    while (!feof($abrirArquivo)) {
        $ler = fgets($abrirArquivo,460);
        $quebrar = explode(" ",trim($ler));
        $quebrar = array_filter($quebrar, function($var){return !is_null($var);});
        //print_r não necessita de "echo"
         print_r($quebrar);
        //se deseja converter para uma string, basta fazer um implode pelo separador:
         echo implode("", $quebrar);
    }
fclose($abrirArquivo);

However, I don’t understand why you converted your string into an array, if you just want to remove the spaces from the contents of a file and show it, just do this:

$data = file_get_contents('seu_arquivo.txt');
$saida = preg_replace('/\s+/',' ', $data);

If you want to write to the file, edit your question to make it clearer. Now if you want to get some values from this array, just access the index, for example, to get 31012012, $quebrar[5].

$quebrar = explode(' ', $saida);

For all lines:

foreach ($quebrar as $linha => $valor) {
    //aqui a posição da linha
    echo $linha . '<br>';
    //aqui o valor da linha
    echo $valor . '<br>';
}

Answer 2

You are reading a file with data of fixed size, so you have to access the positions, can not use explode, nor even assume that space is separator. It may not have space between different data, it may be that space is part of the data. Forget this logic. it would have to be something like this (it can be improved):

$abrirArquivo = fopen($uploadArquivo, "r");
while(!feof($abrirArquivo)){
    $ler = fgets($abrirArquivo,460);
    $campo1 = trim(substr($ler, 0, 4));
    $campo2 = trim(substr($ler, 4, 8));
    $campo3 = ...;
    ...
}
fclose($abrirArquivo);

It’s no use taking shortcuts. What you could do to simplify is to put the sizes or positions in one array and make a loop to automate all of this. Something like this:

$tamanhos = { 4, 8, 2, 18 ..... };
$abrirArquivo = fopen($uploadArquivo, "r");
while(!feof($abrirArquivo)){
    $ler = fgets($abrirArquivo,460);
    $campos = array();
    $posicao = 0;
    for ($i = 0; $i < sizeof($tamanhos); $i++) {
        $campos[] = trim(substr($ler, $posicao, $tamanhos[$i]));
        $posicao += $tamanhos[$i];
    }
}
fclose($abrirArquivo);

I put in the Github for future reference.

Answer 3

preg_replace("#[^0-9|A-Z]#", "", $var);