How to check for images before echo

Question

wrap the html output in the conditional like this:

 <?php $image = wp_get_attachment_image_src(get_field('post_image1'), 'thumbnail');
 if( $image !=false ) {  ?>
    <img src="https://wordpress.stackexchange.com/questions/60013/<?php echo $image[0]; ?>" alt="<?php get_the_title(get_field('post_image1')) ?>" />
 <?php }
 $image = wp_get_attachment_image_src(get_field('post_image2'), 'thumbnail'); 
 if( $image !=false ) {  ?>
    <img src="https://wordpress.stackexchange.com/questions/60013/<?php echo $image[0]; ?>" alt="<?php get_the_title(get_field('post_image2')) ?>" />
 <?php } ?>