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Prepared statements with a variable number of parameters

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I'm using PDO in PHP for database access (actually Zend Framework), and
following best practice by using parameters in prepared statements.

My question is, what do people normally do when there's a variable
number of parameters? - for example:

  select ..... where item_id in ( ... );

In this case, I mightn't know how many values will go inside the
parentheses.

Thanks,

Ray.

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Raymond O'Donnell, Director of Music, Galway Cathedral, Ireland
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Galway Cathedral Recitals: http://www.galwaycathedral.org/recitals
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