循环php $ _POST数组名称

I would like to loop 5 arrays in post.
What should be the right code to display:
$_POST["fp0"]
$_POST["fp1"]
..
$_POST["fp5"]
in a loop?

$x = 0;
while($x <= 5) {
 $fp = ${'_POST["fp'.$x.'"]'};
 echo $fp.'<br>';
 $x++;
}

Try this:

$x = 0;
while($x <= 5) {
 $fp = $_POST["fp$x"];
 echo $fp.'<br>';
 $x++;
}

You can do it simply by for loop, you form must POST values for

fp0, fp1 .... fp5

for($i = 0; $i < 5; $i++) {
    $fp = $_POST['fp'.$i];
    echo $fp . "<br>";
}

0 to 5 are six numbers, so you want to loop 6 elements in an array,

this is what you want

for( $i = 0; $i <= 5; $i++ ){
    echo $_POST['fp'.$i]."<br>
";
}