What does ":" mean when using bindValue() in PHP PDO? -

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what : mean before id in example below? necessary?

$sth->bindvalue(':id', $id, pdo::param_int);

can :id variable?

if pdo::param_int not necessary, why need use it?

:id named placeholder prepared query. somewhere else in code there's query along lines of:

select stuff id = :id

that gets run through pdo's prepare function.

if pdo::param_int not necessary, why need use it?

safety / data consistency. see pdo::param_int important in bindparam?


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