Get file extension

You can use two easy functions to get the file extension in PHP

First

$file = "file.torrent";
echo substr($file,strrpos($file,"."));

Second

$file = "this.is.file.txt";
echo strrchr($file,".");

Restrict file extension using JQuery

$(function() {
    $("input[type=button]").click(function() {
        if (!$("input[type=file]").val()) {
            alert("Select file to Upload !");
            return false;
        }
        var allowedTypes = ["jpg", "jpeg", "gif", "png"];

        var path = $("input[type=file]").val();
        var ext = path.substring(path.lastIndexOf('.') + 1).toLowerCase();

        if (allowedTypes.lastIndexOf(ext) == -1) {
            alert("Select valid file i.e.\n" + allowedTypes);
        }
        alert("Valid file selected");
    });
});

JQuery checkboxes implementation

I found many queries about "how we will make multiple check/unchecked button using JQuery, as well as how to count selected check boxes and then delete the selected records?". Its too easy!

Before working on this example I want to say, always follow the documentation of the product because you will found answers for many questions. Searching on internet not just take your a lot of time but you make yourself addicted of copy and paste.


$(function() {
    $("input[rel=main]").click(function() {
        $("input[rel=records]").attr("checked", this.checked);
        var c = $("input[rel=records]:checked").length;
        $("div > span").text((c > 1) ? c + " records are selected" : c + " record selected");
    });

    $("input[rel=records]").click(function() {
        var c = $("input[rel=records]:checked").length;
        $("div > span").text((c > 1) ? c + " records are selected" : c + " record selected");

        if ($("input[rel=records]").length == $("input[rel=records]:checked").length) {
            $("input[rel=main]").attr("checked", "checked");
        } else {
            $("input[rel=main]").removeAttr("checked");
        }
    });

    $("input[type=button]").click(function() {
        var n = $("input[rel=records]:checked").length;
        if (n <= 0) {
            alert("Select at least one record to delete");
        } else if (n >= 1) {
            var answer = confirm("Are you sure you want to delete " + n + " record(s)?");
            if (answer) {
                $("input[rel=records]:checked").parent().hide();
                $("input[type=button]").after((n > 1) ? " " + n + " records are deleted :)" : " " + n + " record deleted :)");
                $("input:checkbox").removeAttr("checked");
                $("div > span").text("");
            }
        }
    });
});