_wp_check_alternate_file_names( string[] $filenames, string $dir, array $files ): bool

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This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

Helper function to test if each of an array of file names could conflict with existing files.


Array of file names to check.
The directory containing the files.
An array of existing files in the directory. May be empty.


bool True if the tested file name could match an existing file, false otherwise.


function _wp_check_alternate_file_names( $filenames, $dir, $files ) {
	foreach ( $filenames as $filename ) {
		if ( file_exists( $dir . $filename ) ) {
			return true;

		if ( ! empty( $files ) && _wp_check_existing_file_names( $filename, $files ) ) {
			return true;

	return false;



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