php sprintf format string

问题

i know about sprintf but how can i use the same param in any place? example

sprintf("blabla %s 11111 %s", "test");

-it say few params, but i want to place 'test' in two place without duplicate

回答1:

Use the %$ numbered placeholder notation:

sprintf('blabla %1$s 11111 %1$s', "test");

Here, both occurrences of %1$s will be replaced with "test". There is more on this in the sprintf() manual page.

回答2:

This is called "Argument swapping" and documented in example #3 here: http://php.net/sprintf Use "%1$s", to use argument 1, you can use this multiple times within your format string, as shown in Example #4 of php online documentation.

来源：https://stackoverflow.com/questions/4645164/php-sprintf-format-string