:sig
String file_temp(String prefix)

:params
prefix : path prefix for the temp file; a unique suffix is appended
return value : the path of the newly created temp file, or "" on failure

:content
Creates a new, uniquely named empty file using `prefix` as the leading path and returns its full path. Use it for scratch files and the write-then-rename publish pattern.

:example
String path = file_temp("/tmp/doc-temp-");
file_put_contents(path, "scratch");
print(str_starts_with(path, "/tmp/doc-temp-") ? "created a temp file" : path, "\n");
file_unlink(path);

:see
>sys
file_rename
file_put_contents