COMBINE 3 ARRAYS IN PHP

If it is a representation of the data (to show them in a table), I do not see how it makes sense to waste effort and resources in placing the name of every column in the element of the array. Such a practice could have performance consequences, even disastrous if the array is very large.

A better solution would be:

The code would be this:

<?php
    $arrItems=array("Item1","Item2","Item n...");
    $arrUnidades=array(2,4,999);
    $arrPrecios=array(50,400,999);

    $arrColumns=array("Concepto","Unidades","Precio");

    $arrCombinado = array($arrItems,$arrUnidades,$arrPrecios);
    $arrOrdenado = transposeData($arrCombinado);
    $strHTML="<table>";
    $strHTML.="<thead>";
    $strHTML.="<tr>";
    #Columnas
    foreach ($arrColumns as $column){
        $strHTML.="<th>$column</th>";
    }
    $strHTML.="</tr>";

    #Filas
    foreach ($arrOrdenado as $v){
        $strHTML.="<tr>";
        foreach($v as $row){
            #Celdas
            $strHTML.="<td>$row</td>";
        }
        $strHTML.="</tr>";
    }
    $strHTML.="</table>";
    echo $strHTML;

    #Función para hacer la transposición
    function transposeData($data){
        return array_map(function (...$line){
            return $line;
        }, ...$data);
    }

?>

Exit:

We're going to get a table like this:

<link href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.7.1/css/bulma.min.css" rel="stylesheet"/>
    <table class="table is-striped">
        <thead>
            <tr>
                <th>Concepto</th>
                <th>Unidades</th>
                <th>Precio</th>
            </tr>
            <tr>
                <td>Item1</td>
                <td>2</td>
                <td>50</td>
            </tr>
            <tr>
                <td>Item2</td>
                <td>4</td>
                <td>400</td>
            </tr>
            <tr>
                <td>Item n...</td>
                <td>999</td>
                <td>999</td>
            </tr>
        </thead>
    </table>

Demonstration

Here you can see a DEMONSTRATION OF THE CODE and make tests. p>

Reference

You can see the article Transposition in PHP that has served as basis for this response.

Well I have already found the solution, it would be creating a single array with the three uncoordinated arrays:

foreach($arrayConcepto as $key => $valores)
 {
$files[$key]['concepto'] = $valores;
$files[$key]['unidades'] = $arrayUnidades[$key];
$files[$key]['precioGestion'] = $arrayPrecio[$key];
 }

To get the values simply:

   echo "<TABLE width='auto' border='1'>";
foreach ($files as $key2 => $value2) {

    echo "<tr>";
    echo "<td>";
    echo $value2['concepto'];
    echo "</td>";
    echo "<td>";
    echo $value2['unidades'];
    echo "</td>";
    echo "<td>";
    echo $value2['precioGestion'];
    echo "</td>";
    echo "</tr>";
   }
 echo "</table>";

Simple Array
Simply structure them as if it were a database and add line by line:

$datos[] =["Item1",2,50];
$datos[] = ["Item2",4,400];

Or both of them from the tiron:

 $datos = array(
      array("Item1",2,50),
      array("Item2",4,400) 
 );

Then write your values:

<tr>
  <th>Concepto</th>
  <th>Unidades</th>
  <th>Precio</th>
<tr>
<?php
  foreach($datos as $linea){
    echo "<tr>";
    foreach($linea as $dato){
      echo "<td>$dato</td>";
    }
    echo "</tr>";
  };

?>

Associative Array
If you need to be clear about what each item is in the array, you can name each index:

$datos = array(
   array("Concepto"=> "Item1", "Unidades"=>2, "Precio"=>50),
   array("Concepto"=> "Item2", "Unidades"=>4, "Precio"=>400)
)

And to write:

<tr>
  <th>Concepto</th>
  <th>Unidades</th>
  <th>Precio</th>
<tr>
<?php
  foreach($datos as $linea){
    echo "<tr>";
      echo "<td>".$linea["Concepto"]."</td>";
      echo "<td>".$linea["Unidades"]."</td>";
      echo "<td>".$linea["Precio"]."</td>";
    echo "</tr>";        
  };  
?>

The problem is with the structure of the arrangements. You should make an associative array that will be as follows:

$items = array(
    0 => array(
            'concepto' => 'ITEM 1',
            'unidades' => '2',
            'precio' => 50
        ),
    1 => array(
            'concepto' => 'ITEM 2',
            'unidades' => '4',
            'precio' => 400
        ),
);

If you can not arm it with this new structure directly, the simplest way to do it is by foreach the three arrangements;

foreach($miArray as $key => $value){
     $items[$key]['concepto'] = $value; //Para el primer Array
     $items[$key]['unidades'] = $value; //Para el segundo Array
     $items[$key]['precio'] = $value; //Para el tercer Array
}

and then simply make a table as follows:

<table class="table table-striped">
    <thead>
        <tr>
            <th>Concepto</th>
            <th>Unidades</th>
            <th>Precio</th>
        </tr>
    </thead>
    <tbody>
    <?php foreach ($items as $item){?>
        <tr>
            <td><?php echo $item['concepto'];?></td>
            <td><?php echo $item['unidades'];?></td>
            <td><?php echo $item['precio'];?></td>
        </tr>
    <?php } ?>
    </tbody>
</table>