How Can I Use Placeholder SQL Queries to Pass Arrays to WHERE Clauses?

Using Placeholder SQL Queries to Pass Arrays to WHERE Clauses

When dealing with arrays in SQL queries, particularly when using WHERE clauses, it becomes necessary to find a way to incorporate the array's values into the query string. The provided array of IDs ($galleries) requires a query that efficiently uses these values in its WHERE clause.

One solution involves using placeholder SQL queries. Follow these steps:

1. Define the Placeholder String:

$placeholder = join(',', array_fill(0, count($galleries), '?'));

This creates a string with question marks separated by commas, representing the placeholders for the array values. In our example, the placeholder string would be "?,,?".

2. Prepare the Query String:

$query = "SELECT * FROM galleries WHERE id IN ({$placeholder})";

The query string uses the IN operator and the placeholder string to incorporate the array values into the WHERE clause.

3. Bind the Array Values:

Using a prepared statement, bind the array values to the placeholders:

$stmt = $conn->prepare($query);
$stmt->bind_param(str_repeat('i', count($galleries)), ...$galleries);

This binds the array elements to the placeholders in the prepared statement.

4. Execute the Query:

$stmt->execute();

The prepared statement is executed, effectively using the array values in the WHERE clause.

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