How to get null attribute product value in magento 1 addAttributeToFilter Filter Query | Where condition

$collection = Mage::getModel('catalog/product')->getCollection()
        ->addAttributeToSelect(['entity_id'])
        ->addAttributeToFilter(
        array(
            array('attribute'=> 'pricegroup','null' => true),
            array('attribute'=> 'pricegroup','eq' => ''),
            array('attribute'=> 'pricegroup','eq' => 'NO FIELD')
        ),
        '',
        'left')
        ->addAttributeToFilter('status', ['eq' => 1]);
echo $collection->getSelect();
echo '<pre>';print_r($collection->getData());exit;

How to upload image file with ajax

jQuery("form#add-group-form").submit(function(e){
        e.preventDefault();
        var formData = new FormData(jQuery(this)[0]);
       
        jQuery.ajax({
            type:"POST",
            url:jQuery(this).attr("action"),
            data:formData,
            processData: false,
            contentType: false,
            dataType: "json",
            success: function(response){
                alert(response);
            }
        });
    });

How to create multidimensional array in jQuery | Javascript

var jaydip = {};
for(var i=0; i < items.length; i++){
   jaydip[items[i]] = items[i]+'123';
}
console.log(jaydip);
alert(JSON.stringify(jaydip));

Re-index primary key in Mysql database table

set @ROW = 0;

UPDATE `visitorhistory` SET `id` = @ROW := @ROW+1 ORDER BY `id` ASC;

How to Eliminate render-blocking JavaScript and CSS on WordPress

https://www.hostinger.in/tutorials/how-to-fix-eliminate-render-blocking-javascript-and-css-in-above-the-fold-content-on-wordpress

How to work async in jQuery ajax | Does it have something to do with preventing other events on the page from firing?

Yes, async to false means that the statement you are calling has to complete before the next statements of your function can be called. If you set async: true then that statement will begin it's execution the same time and the next statement will be called regardless of whether the async statement has completed yet.

jQuery('body #pricegroup-products-container').on('click', '.saveimage' , function (e) {
        var returnHtml = '';
        jQuery.ajax({
            type: "POST",
            async: false,
            cache: false,
            url: url,
            data: {id: '12345'},
            dataType: "html",
            success: function (response) {
                returnHtml = response;
            }
        });
        alert(returnHtml);
    });

How to set cron job in heroku in PHP | Codeigniter

Step 1:  Install Heroku Scheduler add-ons from Heroku.

Step 2: Goto Heroku Scheduler page and add Job, set time interval and add command " php /app/index.php orderupdate crontset jaydip "

1. php = server language
2. /app/index.php = Path of the project root index.php
3. orderupdate = name of controller
4. crontset = name of function
5. jaydip = variable name which you want to get into crontset function

Step 3: open Orderupdate.php controller

public crontset function($name){

echo $name;

}