Magento 2: How to pass object as a argument from phtml

Question

I want to pass object as a argument from phtml file how can I do this? As I've checked we can pass string using $block->setData('var','test') but didn't found for object.

Answer 1

a simple example to pass a variable from Magento (template, controller, etc) file to a block with php code.

Call a block using the createBlock() method:

<?php
echo $this->getLayout()->createBlock('module/template_name')
->setData('key', $obj)
->setTemplate('module/newblock.phtml')->toHtml();

Answer 2

Even if this post is 3 years old I'll answer it in case someone needs the solution.

WARNING: you should never use getLayout()->createBlock, the correct way would be creating a new <block> inside the layout.xml. Also, you should never use ObjectManager as done in this answer, but it's the only way that I found working with the getLayout()->createBlock instruction.

This is the solution (inside your .phtml):

<?php

// Get an instance of the class to pass to the block as argument
$obj = Bootstrap::getObjectManager()->get(ObjectClassToPassToBlock::class);

...

// Create the block passing it the object inside the param "argumentKey"
$block = $this->getLayout()->createBlock(
    Block::class,
    'block_name',
    [
        'data' => ['argumentKey' => $obj]
    ]
);
?>
<?= $block->toHtml(); ?>

...

Doing like this you will create a block with name block_name and class Block::class and you will pass it an argument of type xsi:type="object" inside argumentKey

If you want to set the arguments of the block using the $block->setData instruction you can do like this:

$block->setData('argumentKey', $obj);