当我在PHP中显示变量时，为什么零和字母缺失？

Question

I'm new to PHP and I got somebody else's code to work on.

There are multiple variables including $CARD.

But unlike other variables $CARD cannot display a character.

For example, when I input a value like 'passw0rd', all the other variables outputs 'passw0rd'. But the $CARD variable outputs a '0'.

And also, when I take an input like '0123', all the other variables outputs the same '0123'. But only the $CARD variable drops the 0 and outputs '123'.

Is there any PHP elements that I should be suspecting/?

Answer 1

If you see some thing like this in the code. that $CARD variable is cast to int.

$num = "3.14";
$CARD = (int)$num;

You can convert it to string as follows.

$var2 = (string)$CARD;