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.

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http://forum.jquery.com/topic/ajax-sending-json-data-with-boolean-value#14737000000976384 :

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

Answer 1

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

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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().