Sending Integer Values With AJAX

Question

I don't know javascript very well. I have a LIKE button.

<a href="" onClick="begen(<?php echo $post->ID; ?>); return false;">LIKE</a>

And,

function begen(id)
{
    $.ajax({
        type:"POST",
        url:"begen.php",
        data:"id="+id,
        cache:false
    });
}

begen() sending id of post to begen.php as a POST header .

I'm checking it with is_integer() in begen.php for security

if(!is_integer($_POST["id"]))
    die("It's not an integer");

When I test it, begen(3) returning "It's not an integer" . I'm not sure why it's (3) not an integer.

HTTP is a text protocol with no concept of bools or ints, so everything needs to be stringified. The stringification of false is certainly not 0.

If everything is a string, how can I be sure that id is really an id

-1: Didn't even bother to look at the documentation for the function, which answers this question right at the top in a large-font note. — Lightness Races in Orbit
– Lightness Races in Orbit, Commented Jan 10, 2012 at 20:49
I don't really use Twitter. I might post it to my Facebook wall, though. — Lightness Races in Orbit
– Lightness Races in Orbit, Commented Jan 10, 2012 at 20:57

Lightness Races in Orbit · Accepted Answer · 2012-01-10 20:48:30Z

2

All GET and POST arguments are provided to your script as strings. Were you looking for is_numeric?

Next time, read the documentation before posting here.

The manual page for is_integer says:

This function is an alias of: is_int().
The manual page for is_int says:

To test if a variable is a number or a numeric string (such as form input, which is always a string), you must use is_numeric().

answered Jan 10, 2012 at 20:48

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2 Comments

For edit : i didn't read PHP documentation , because i think i have problem with JS, not PHP

Should have read the documentation for every function involved, as a very initial debugging step.