php - PDO(?) -- :variable -

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I found this code. How is it possible to use a variable (delete command) before defining it? My understanding, at least - is that: ID for the value of $ id. 

  $ this-> Db- & gt; Query ('ID = ID: in Sessions with Sentence'); $ This- & gt; Db- & gt; Tie (': id', $ id);

here, : id is not a variable, it A named placeholder.

In the second statement, you can tie PDF to the value of $ id with the : id placeholder.

See.


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