Using foreach with Variable + Index combination

Question

Following my unsolved question, I'm trying to figure how to use foreach

How can I make this kind of code:

$m1="mbob";
$m2="mdan";
$m3="mbill";

$a = array('bob', 'dan', 'bill');

$i = 1; /* for illustrative purposes only */

foreach ($a as $v) {
    echo "\$a[$i] => $v.\n";
    echo $m[$i];
    $i++;
}

To output this result:

$a[1] => bob.
mbob
$a[2] => dan.
mdan
$a[3] => bill.
mbill

I'm getting the error:

Undefined variable: m

But I'm trying to output the m1,m2,m3 variables, not just m.

Are you unable to make the $m values into an array? Because what you are asking for is pretty bad practice, arguably. — HC_
– HC_, Commented Jan 20, 2016 at 23:25
@Fred-ii- - No... that's your assumption, under the guise of logic. — Andrew Cheong
– Andrew Cheong, Commented Jan 20, 2016 at 23:27
@HC_ I don't want to make it into an array, if you'll take a look at my previous question you'll see that an array wouldn't fit, as I'll have to create dozens of arrays and it will be a mess to change values when needed. — rockyraw
– rockyraw, Commented Jan 20, 2016 at 23:29

pid · Accepted Answer · 2016-01-20 23:25:50Z

1

That's something I've never done but you may try and give it a shot:

echo $('m' . $i);

That's similar to function invocations where you construct the function name dynamically through a string, but I don't know if it works with local variables as well.

answered Jan 20, 2016 at 23:25

pid

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HC_ · Accepted Answer · 2016-01-20 23:27:39Z

1

Here is code that works, but I would not recommend it. I would recommend just storing your $m values in an array.

<?php
    $m1="mbob";
    $m2="mdan";
    $m3="mbill";

    $array = array('bob', 'dan', 'bill');
    $i = 1;
    foreach ($array as $value) {
        echo "\$a[$i] => $value.\n";
        echo '<br>';
        echo ${"m".$i};
        echo '<br>';
        $i++;
    }
?>

answered Jan 20, 2016 at 23:27

HC_

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JRR · Accepted Answer · 2016-01-20 23:27:37Z

0

In your code, $m is not an array. There is a way to create variable variable names which appears to be what you are trying to do, but simpler is to create $m as an array:

$m =array("mbob","mdan","mbill");

$a = array('bob', 'dan', 'bill');

$i = 1; /* for illustrative purposes only */

foreach ($a as $v) {
    echo "\$a[$i] => $v.\n";
    echo $m[$i];
    $i++;
}

answered Jan 20, 2016 at 23:27

JRR

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