What does the token %1$s in WordPress represent [closed]

Read the PHP docs on sprintf().

• %s is just a placeholder for a string
• %d is just a placeholder for a number

So an example of sprintf would look like this:

$variable = sprintf(
    'The %s ran down the %s',   // String with placeholders
    'dog',      // Placed in the first %s placeholder
    'street'    // Placed in the second %s placeholder
);

Which will return a string to our variable $variable:

The dog ran down the street

By numbering the placeholders it’s both a developer-friendly way to quickly tell which following string will be placed where. It also allows us to reuse a string. Let’s take another example with numbered placeholders:

$variable = sprintf(
    'The %1$s ran down the %2$s. The %2$s was made of %3$s',    // String with placeholders
    'dog',      // Will always be used in %1$s placeholder
    'street',   // Will always be used in %2$s placeholder
    'gravel'    // Will always be used in %3$s placeholder
);

Which will return a string to our variable $variable:

The dog ran down the street. The street was made of gravel

Finally, the __() function let’s us translate strings passed to it. By passing __() placeholders, and then passing that whole string to sprintf(), we can translate whatever is passed to the translating function allowing us to make our string and application a bit more dynamic.