Need to check if a line is duplicated in my TXT how do I do?

Question

I need to check if a line is duplicated in mine TXT how do I do?

---

<?php
$divisao = "1000000000000";
$linha  = file("clientes/clientes.txt"); //Abre o banco de dados
$total  = count($linha); //Conta as linhas
$paginas = ceil($total/$divisao)-1; //Faz a divisão

if(!$pagina='$pagina;' ){$pagina = "0";}
else if(!is_numeric($pagina)){$pagina = "0";}
else if($pagina > $paginas){$pagina = "0";}
else{$pagina = $pagina;}
if($total<=0){
    echo "<P><DIV style=\"font-family:arial; font-size:14px; color:#999; text-align:center; margin-left:0 auto;\">Sem clientes para exibir!</DIV>";
}


$inicio = $pagina*$divisao;
$final  = $inicio+$divisao;
$final  = ($final > $total) ? $total : $final;
$linha = array_reverse($linha);
for ($i = $inicio; $i < $final; $i++){
list($dado1,$dado2,$dado3,$dado4,$dado5,$dado6) = explode("|",$linha[$i]);
echo "<form method=\"POST\" action=\"form.php\" onSubmit=\"if(!confirm('Deseja realmente continuar o pedido?')){return false;}\">";
echo "<tr><td>";

echo "<div id=\"div-clientes\">";


echo "<span style=\"display:none;\">$dado2</span>";
echo "<input type=\"text\" name=\"id\" value=\"$dado1\" id=\"campo_cads_id\" readonly=\"true\">";
echo "<input type=\"text\" name=\"data\" value=\"$dado6\" id=\"campo_cads_data\" readonly=\"true\">";
echo "<input type=\"text\" name=\"telefone\" value=\"$dado2\" id=\"campo_cads_tel\">";
echo "<input type=\"text\" name=\"nome\" value=\"$dado3\" id=\"campo_cads\">";
echo "<input type=\"text\" name=\"endereco\" value=\"$dado4\" id=\"campo_cads_end\">";
echo "<input type=\"text\" name=\"referencia\" value=\"$dado5\" id=\"campo_cads\">";

?>

Example of txt data

DADO1|DADO2|DADO3|DADO4|DADO5|DADO6|
DADO1|DADO2|DADO3|DADO4|DADO5|DADO6|
DADO1|DADO2|DADO3|DADO4|DADO5|DADO6|

I need you to check example the dado2 with the dado2 next line and tell if it’s duplicated?

Answer 1

Function in_array(variable, array) aims to check whether the object is contained in the array, as the name says it checks whether the value is in the array. Will return true or false, see the example below:

<?php
$people = array("Peter", "Joe", "Glenn", "Cleveland");

if (in_array("Glenn", $people))
  {
  echo "Encontrado";
  }
else
  {
  echo "Não encontrado";
  }
?>

In this case, Glenn is in the array, so he will enter the first if. More questions the official documentation: https://www.w3schools.com/php/func_array_in_array.asp

PS: Dùvidas like this one are easily solved in other questions already asked here in the group. Before posting read the documentation

To research how a whole does it:

if(strpos(file_get_contents("texto.txt"),$string)) {
    echo "tem";
}else{
    echo "não tem";
}

Answer 2

You can use this code to read the file .txt line by line checking occurrences on each line:

<?php
$dado2 = "DADO2";

$arquivo = file("teste.txt");
$encontrar = $dado2;
$repetido = false;

if ($arquivo !== false)
{
    foreach($arquivo as $index => $line)
    {
         if (preg_match("/$encontrar/", trim($line), $matches))
        {
            if($repetido){
               echo 'A linha '. ($index+1) .' contém repetido '.$encontrar . '<br />';
            }else{
               echo 'A linha '. ($index+1) .' contém '.$encontrar . '<br />';
            }
            $repetido = true;
        }
    }
}
?>