wp-admin/includes/image.php:1079Validates that file is an image.
$pathstringboolfunction file_is_valid_image( $path ) { $size = wp_getimagesize( $path ); return ! empty( $size );}Introduced in 2.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/image.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.