Question

How would I alter certain elements in the inner for loop if I am using an array with numbers?

e.g

$decryptFields[0] = '1';
$decryptFields[1] = '3';

if($z) == ANY OF THOSE NUMBERS IN THE ARRAY DO SOMETHING.

$x[$i][$z]

so if the inner for loop contains any of those numerals then something will happen e.g maybe I’ll make the text bold.

foreach($decryptFields as $dfield) {
    echo $dfield;
}
for($i = 0; $i< 10; $i++) {
    for($z = 0; $z < $columnLength; $z++) {
        echo $x[$i][$z];
    }
}       
}

Answer 1

Your question is not very clear, but I will do my best to answer it.

If you want to ‘do something’ if the value $z equals any of the values in the array $decryptFields, you can simply use:

if(in_array($z, $decryptFields)){ /*do something*/}

EDIT: It seems $z is also an array of values.

In that case, use :

$intersection = array_intersect($z, $decryptFields);
foreach($intersection as $key=>$value){
    echo "<b>$value</b>";
}