What is the purpose of using z-order in PHP when inserting images?

When inserting images in PHP, using z-order allows you to control the stacking order of the images on the webpage. This is important when you have multiple images overlapping each other, as it determines which image appears on top. By setting the z-order, you can ensure that certain images are displayed in front of others based on their priority.

echo '<img src="image1.jpg" style="position:absolute; top:0; left:0; z-index:1;">';
echo '<img src="image2.jpg" style="position:absolute; top:0; left:0; z-index:2;">';
echo '<img src="image3.jpg" style="position:absolute; top:0; left:0; z-index:3;">';