Override Block Files Header.Php

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So in this blog, I am going to explain how we can override the Header.php file.

Base Path: magento/vendor/magento/module-theme/Block/Html/Header.php

New Path: app/code/Bluethink/Overridemodule/Block/Html/Header.php

To override the Block file first we need to create a module core file that is registration.php and module.xml

Below are the steps :

step 1 : Create registration.php file

app/code/Bluethink/Overridemodule/registration.php

<?php
\Magento\Framework\Component\ComponentRegistrar::register(
	\Magento\Framework\Component\ComponentRegistrar::MODULE,
	'Bluethink_Overridemodule',
	__DIR__
);

<?php

\Magento\Framework\Component\ComponentRegistrar::register(

\Magento\Framework\Component\ComponentRegistrar::MODULE,

'Bluethink_Overridemodule',

__DIR__

);

step 2 : Create module.xml file

app/code/Bluethink/Overridemodule/etc/module.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="Bluethink_Overridemodule">
    </module>
</config>

<?xml version="1.0"?>

</module>

</config>

Step 3 : Create di.xml file

app/code/Bluethink/Overridemodule/etc/di.xml

<?xml version="1.0"?>
    <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Acl/etc/acl.xsd">
        <preference for="Magento\Theme\Block\Html\Header" 
                    type="Bluethink\Overridemodule\Block\Html\Header" />
    </config>

<?xml version="1.0"?>

<preference for="Magento\Theme\Block\Html\Header"

type="Bluethink\Overridemodule\Block\Html\Header" />

</config>

step 4 : Create Header.php file

app/code/Bluethink/Overridemodule/Block/Html/Header.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

namespace Bluethink\Overridemodule\Block\Html;

/**
 * Html page header block
 *
 * @api
 * @since 100.0.2
 */
class Header extends \Magento\Theme\Block\Html\Header
{
    /**
     * Current template name
     *
     * @var string
     */
    protected $_template = 'Magento_Theme::html/header.phtml';

    /**
     * Retrieve welcome text
     *
     * @return string
     */
    public function getWelcome()
    {
        if (empty($this->_data['welcome'])) {
            $this->_data['welcome'] = $this->_scopeConfig->getValue(
                'design/header/welcome',
                \Magento\Store\Model\ScopeInterface::SCOPE_STORE
            );
        }
        //return __($this->_data['welcome']);
        return "I am from Override Block Module!!!!!" ;
        
    }
}

<?php

/**

* See COPYING.txt for license details.

namespace Bluethink\Overridemodule\Block\Html;

/**

* Html page header block

* @api

* @since 100.0.2

class Header extends \Magento\Theme\Block\Html\Header

{

/**

* Current template name

* @var string

protected $_template = 'Magento_Theme::html/header.phtml';

/**

* Retrieve welcome text

* @return string

public function getWelcome()

{

if (empty($this->_data['welcome'])) {

$this->_data['welcome'] = $this->_scopeConfig->getValue(

'design/header/welcome',

\Magento\Store\Model\ScopeInterface::SCOPE_STORE

);

}

//return __($this->_data['welcome']);

return "I am from Override Block Module!!!!!" ;

}

After Run This Command

sudo php bin/magento setup:upgrade
sudo php bin/magento setup:di:compile
sudo php bin/magento setup:static-content:deploy -f
sudo php bin/magento c:f
sudo chmod -R 777 var/ pub/static generated/