programming WHERE section in sql

If you need to find any records which contain any of your variable you can use OR as follow

SELECT * FROM mytable WHERE id = $v1 OR id = $v2 OR id = $v3

If you are trying to select multiple ID values, use IN conditional:

SELECT * FROM mytable WHERE id IN ($v1, $v2, $v3)

EDIT: Asked for a flexible way to add values:

Assuming that this query is set by a function and this function will receive all ID values that should be in where clause. Something like:

<?php

$example_ids = array(1, 5, 7, 15, 22);

wherein($example_ids)

function wherein($ids){
    // Select part
    $query = "SELECT * FROM mytable ";

    // Where statement
    $where = " WHERE id IN (";

    // For loop to use each value sent
    // as a value in IN (...
    for ($i=0; $i < count($ids); $i++) { 
        // Eg: $i = 0
        // $ids[$i] = 1
        // 
        // So:
        // WHERE id IN (1
        $where .= $ids[$i];

        // If its not the last value then
        // add a comma for SQL syntax
        if ($i < count($ids) - 1)
            /// Where id IN (1,
            $where .= ",";
    }

    // At the end of the loop, $where must be
    // something like:
    // WHERE id IN (1,5,7,15,22
    // 
    // Once again, for SQL syntax, the close )
    $where .= ")";

    // Finaly, the last step, putting all together:
    // SELECT * FROM mytable  WHERE id IN (1,5,7,15,22)
    $query .= $where;
}