plugins dev first steps

<?php
    $dates = array
    (
        '0' => "2013-02-18 05:14:54",
        '1' => "2013-02-12 01:44:03",
        '2' => "2013-02-05 16:25:07",
        '3' => "2013-01-29 02:00:15",
        '4' => "2013-01-27 18:33:45"
    );

    function closest($dates, $findate)
    {
        $newDates = array();

        foreach($dates as $date)
        {
            $newDates[] = strtotime($date);
        }

        echo "<pre>";
        print_r($newDates);
        echo "</pre>";

        sort($newDates);
        foreach ($newDates as $a)
        {
            if ($a >= strtotime($findate))
                return $a;
        }
        return end($newDates);
    }

    $values = closest($dates, date('2013-02-04 14:11:16'));
    echo date('Y-m-d h:i:s', $values);
?>

//// Validate if Email field is spam
add_action( 'elementor_pro/forms/validation/email', function( $field, $record, $ajax_handler ) {
    // Looking if email found in spam array, you can add to the array
  $spamemails = array("ericjonesonline@outlook.com", "eric@talkwithwebvisitor.com");
    if ( in_array( $field['value'] , $spamemails) ) {
        $ajax_handler->add_error( $field['id'], 'אנחנו לא אוהבים ספאם, נסו מייל אחר' );
    }
}, 10, 3 );

<?php 
function count_num_finger( $n ) 
{ 
	$r = $n % 8; 
	if ($r == 1) 
		return $r; 
	if ($r == 5) 
		return $r; 
	if ($r == 0 or $r == 2) 
		return 2; 
	if ($r == 3 or $r == 7) 
		return 3; 
	if ($r == 4 or $r == 6) 
		return 4; 
}	 

// Driver Code 
$n = 30; 
echo(count_num_finger($n)); 
 
?> 

<?php 
// PHP program to find nth 
// magic number 

// Function to find nth 
// magic number 
function nthMagicNo($n) 
{ 
	$pow = 1; 
	$answer = 0; 

	// Go through every bit of n 
	while ($n) 
	{ 
	$pow = $pow * 5; 

	// If last bit of n is set 
	if ($n & 1) 
		$answer += $pow; 

	// proceed to next bit 
	$n >>= 1; // or $n = $n/2 
	} 
	return $answer; 
} 

// Driver Code 
$n = 5; 
echo "nth magic number is ", 
	nthMagicNo($n), "\n"; 

// This code is contributed by Ajit. 
?> 

add_filter( 'woocommerce_available_payment_gateways', 'conditionally_disable_cod_payment_method', 10, 1);
function conditionally_disable_cod_payment_method( $gateways ){
    // HERE define your Products IDs
    $products_ids = array(2880);

    // Loop through cart items
    foreach ( WC()->cart->get_cart() as $cart_item ){
        // Compatibility with WC 3+
        $product_id = version_compare( WC_VERSION, '3.0', '<' ) ? $cart_item['data']->id : $cart_item['data']->get_id();
        if (in_array( $cart_item['product_id'], $products_ids ) ){
            unset($gateways['cod']);
            break; // As "COD" is removed we stop the loop
        }
    }
    return $gateways;
}

use App\Http\Controllers\OtherController;

class TestController extends Controller
{
    public function index()
    {
        //Calling a method that is from the OtherController
        $result = (new OtherController)->method();
    }
}

2) Second way

app('App\Http\Controllers\OtherController')->method();

Both way you can get another controller function.

add_filter( 'woocommerce_product_get_stock_quantity' ,'custom_get_stock_quantity', 10, 2 );
add_filter( 'woocommerce_product_variation_get_stock_quantity' ,'custom_get_stock_quantity', 10, 2 );
function custom_get_stock_quantity( $value, $product ) {
    $value = 15; // <== Just for testing
    return $value;
}

<?php
/**
 * Titlebar template.
 *
 * @author     ThemeFusion
 * @copyright  (c) Copyright by ThemeFusion
 * @link       https://theme-fusion.com
 * @package    Avada
 * @subpackage Core
 */

// Do not allow directly accessing this file.
if ( ! defined( 'ABSPATH' ) ) {
	exit( 'Direct script access denied.' );
}
?>
<?php $backgroundImg = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'full' );?>
<div class="fusion-page-title-bar fusion-page-title-bar-<?php echo esc_attr( $content_type ); ?> fusion-page-title-bar-<?php echo esc_attr( $alignment ); ?>" style="background: url('<?php echo $backgroundImg[0]; ?>') no-repeat center center; ">
	<div class="fusion-page-title-row">
		<div class="fusion-page-title-wrapper">
			<div class="fusion-page-title-captions">

				<?php if ( $title ) : ?>
					<?php // Add entry-title for rich snippets. ?>
					<?php $entry_title_class = ( Avada()->settings->get( 'disable_date_rich_snippet_pages' ) && Avada()->settings->get( 'disable_rich_snippet_title' ) ) ? 'entry-title' : ''; ?>
					<h1 class="<?php echo esc_attr( $entry_title_class ); ?>"><?php echo $title; // phpcs:ignore WordPress.Security.EscapeOutput ?></h1>

					<?php if ( $subtitle ) : ?>
						<h3><?php echo $subtitle; // phpcs:ignore WordPress.Security.EscapeOutput ?></h3>
					<?php endif; ?>
				<?php endif; ?>

				<?php if ( 'center' === $alignment ) : // Render secondary content on center layout. ?>
					<?php if ( 'none' !== fusion_get_option( 'page_title_bar_bs' ) ) : ?>
						<div class="fusion-page-title-secondary">
							<?php echo $secondary_content; // phpcs:ignore WordPress.Security.EscapeOutput ?>
						</div>
					<?php endif; ?>
				<?php endif; ?>

			</div>

			<?php if ( 'center' !== $alignment ) : // Render secondary content on left/right layout. ?>
				<?php if ( 'none' !== fusion_get_option( 'page_title_bar_bs' ) ) : ?>
					<div class="fusion-page-title-secondary">
						<?php echo $secondary_content; // phpcs:ignore WordPress.Security.EscapeOutput ?>
					</div>
				<?php endif; ?>
			<?php endif; ?>

		</div>
	</div>
</div>

<?php
// Grab the metadata from the database
$text = get_post_meta( get_the_ID(), 'yourprefix_text', true );

// Echo the metadata
echo esc_html( $text );
?>

function search_by_sku( $search, &$query_vars ) {
    global $wpdb;
    if(isset($query_vars->query['s']) && !empty($query_vars->query['s'])){
        $args = array(
            'posts_per_page'  => -1,
            'post_type'       => 'product',
            'meta_query' => array(
                array(
                    'key' => '_sku',
                    'value' => $query_vars->query['s'],
                    'compare' => 'LIKE'
                )
            )
        );
        $posts = get_posts($args);
        if(empty($posts)) return $search;
        $get_post_ids = array();
        foreach($posts as $post){
            $get_post_ids[] = $post->ID;
        }
        if(sizeof( $get_post_ids ) > 0 ) {
                $search = str_replace( 'AND (((', "AND ((({$wpdb->posts}.ID IN (" . implode( ',', $get_post_ids ) . ")) OR (", $search);
        }
    }
    return $search;
    
}
    add_filter( 'posts_search', 'search_by_sku', 999, 2 );

/***** Shorten Post/Page link  *****/
//============================
add_filter( 'get_shortlink', function ( $shortlink ) {
    return $shortlink;
});

//******--- Remove Font Awesome ---*****
//===============================
add_action( 'elementor/frontend/after_register_styles',function() {
	foreach( [ 'solid', 'regular', 'brands' ] as $style ) {
		wp_deregister_style( 'elementor-icons-fa-' . $style );
	}
}, 20 );

//*****---  Remove Eicons:  ---*****
//==========================
add_action( 'wp_enqueue_scripts', 'remove_default_stylesheet', 20 ); 
function remove_default_stylesheet() { 
	wp_deregister_style( 'elementor-icons' ); 
}

composer install --ignore-platform-reqs

// replace get()
$products = Product::where('active', 1)->get();

// by paginate()
$products = Product::where('active', 1)->paginate(10);