Question

Here is my code:

var var_ids = new Array();
var i = 0;
jQuery("select").each(function() {
var_ids[i] = jQuery("option:selected",this).val();
i++;
}

var $data = {
action: "do_something",
var_ids: var_ids,
};
jQuery.post(doajax.ajaxurl, $data, function(response) {
    alert(response);

}); 

And in my php:

$ids = mysql_real_escape_string(trim($_POST['var_ids']));
exit(print_r($ids));

And it just returns garbage…So my question is how to pass an array via AJAX to post php?

Thank you.

Answer 1

Most likely you get unexpected results because you apply string-related functions trim and mysql_real_escape_string to array $_POST['var_ids']

As long as it is just an array of integers – the only mysql sanitize you need is casting to int:

$ids = array_map('intval', $_POST['var_ids']);
print_r($ids);