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Function Signature:

in_the_loop

Function Description:

Determines whether the caller is in the Loop.

Function Examples:

⚠️ Examples below are generated with GPT-3 once every hour. Do not take them too seriously.
Consider them as some extra input in your learning process - reason about them. Will it work? What could fail? 
 'product',
    'posts_per_page' => 5
);
$products = new WP_Query( $args );

if ( $products->have_posts() ) {
    $count = 0;
    while ( $products->have_posts() ) {
        $products->the_post();
        if ( in_the_loop() ) {
            $class = 'first-post';
        } else {
            $class = '';
        }
        echo '
';
        the_title();
        echo '
';
        $count++;
    }
}
?>
 'product',
    'posts_per_page' => 5
);
$products = new WP_Query( $args );

if ( $products->have_posts() ) {
    while ( $products->have_posts() ) {
        $products->the_post();
        if ( in_the_loop() ) {
            echo 'This is the current post.';
        } else {
            echo 'This is not the current post.';
        }
    }
    wp_reset_postdata();
}

if ( in_the_loop() ) {
    echo 'This should not be the current post.';
} else {
    echo 'This is not the current post.';
}
?>