PHP quirks and pitfalls [closed]

Answer 1

$x = "a string";

if ($x == 142)
{
    echo "lol, of course $x is a number";
}
else
{
    echo "$x is clearly not equal to 142";
}

When run:

lol, of course a string is a number

You must use ===

$x = "a string";

if ($x === 142)
{
    echo "lol, of course $x is a number";
}
else
{
    echo "$x is clearly not equal to 142";
}

When run:

a string is clearly not equal to 142