Question

I would like the code below to return ‘Int’ the first time and ‘Not int’ the second time. Unfortunately it returns ‘Not int’ twice instead.

How can I fix this?

<?php
$test1='1';
if(is_int($test1)){
        echo "Int";
}else{
        echo "Not int";
}

echo "\n";

$test2='1a';
if(is_int($test2)){
        echo "Int";
}else{
        echo "Not int";
}
?>

Answer 1

By wrapping the number in quotation marks '1', you are declaring a string.
Instead you got to use $test1 = 1;.

By using the PHP ctype_digit() function, you can check if a string only contains digits.
You could also use the is_numeric() function, which also returns true if the string contains a exponential part like +0123.45e6 or a hex value 0xFF.