path_is_absolute( string $path ): bool

Source

function path_is_absolute( $path ) {	/* * Check to see if the path is a stream and check to see if its an actual * path or file as realpath() does not support stream wrappers. */	if ( wp_is_stream( $path ) && ( is_dir( $path ) || is_file( $path ) ) ) {	return true;	}	/* * This is definitive if true but fails if $path does not exist or contains * a symbolic link. */	if ( realpath( $path ) === $path ) {	return true;	}	if ( strlen( $path ) === 0 || '.' === $path[0] ) {	return false;	}	// Windows allows absolute paths like this.	if ( preg_match( '#^[a-zA-Z]:\\\\#', $path ) ) {	return true;	}	// A path starting with / or \ is absolute; anything else is relative.	return ( '/' === $path[0] || '\\' === $path[0] ); } 

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