How can PHP developers ensure cross-domain compatibility when implementing features like lightboxes within iframes?

To ensure cross-domain compatibility when implementing features like lightboxes within iframes, PHP developers can use the X-Frame-Options header to control whether a page can be displayed in an iframe on another site. By setting the X-Frame-Options header to 'SAMEORIGIN', the page can only be displayed in an iframe on the same origin. This helps prevent clickjacking attacks and ensures that the content is only embedded in trusted sources. 

header('X-Frame-Options: SAMEORIGIN');

Keywords

PHP cross-domain compatibility lightboxes iframes security.

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