PHP PDO::prepare() Method: Usage and Examples

Creates a prepared statement for repeated execution with bound values.

The objective is to understand the behavior and operational limits, not only the method name.

What It Does

Creates a prepared statement for repeated execution with bound values.

Syntax and Return Value

PDO::prepare(Parameter #0 [ <required> string $query ], Parameter #1 [ <optional> array $options = [] ]): mixed

The return value and exceptional cases depend on the call described here: Placeholders represent SQL values, not table or column identifiers.

Example 1: Basic Use

This self-contained SQLite example uses in-memory demo data; it requires the pdo_sqlite driver.

<?php
$pdo = new PDO('sqlite::memory:', null, null, [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION]);
$pdo->exec('CREATE TABLE products (id INTEGER PRIMARY KEY, name TEXT NOT NULL, price INTEGER NOT NULL, active INTEGER)');
$pdo->exec("INSERT INTO products (id,name,price,active) VALUES (1,'Desk',120,1),(2,'Lamp',35,1),(3,'Chair',85,0)");
$stmt = $pdo->prepare("SELECT name FROM products WHERE id = :id");
$stmt->execute(["id" => 1]);
echo $stmt->fetchColumn() ?: "not found";

Example 2: A Second Scenario

This self-contained SQLite example uses in-memory demo data; it requires the pdo_sqlite driver.

<?php
$pdo = new PDO('sqlite::memory:', null, null, [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION]);
$pdo->exec('CREATE TABLE products (id INTEGER PRIMARY KEY, name TEXT NOT NULL, price INTEGER NOT NULL, active INTEGER)');
$pdo->exec("INSERT INTO products (id,name,price,active) VALUES (1,'Desk',120,1),(2,'Lamp',35,1),(3,'Chair',85,0)");
$stmt = $pdo->prepare("SELECT name FROM products WHERE id = :id");
$stmt->execute(["id" => 2]);
echo $stmt->fetchColumn() ?: "not found";

Example 3: Practical Checks

This self-contained SQLite example uses in-memory demo data; it requires the pdo_sqlite driver.

<?php
$pdo = new PDO('sqlite::memory:', null, null, [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION]);
$pdo->exec('CREATE TABLE products (id INTEGER PRIMARY KEY, name TEXT NOT NULL, price INTEGER NOT NULL, active INTEGER)');
$pdo->exec("INSERT INTO products (id,name,price,active) VALUES (1,'Desk',120,1),(2,'Lamp',35,1),(3,'Chair',85,0)");
$stmt = $pdo->prepare("SELECT name FROM products WHERE id = :id");
$stmt->execute(["id" => 3]);
echo $stmt->fetchColumn() ?: "not found";

Important Behavior and Edge Cases

Placeholders represent SQL values, not table or column identifiers.

For production use, also account for error handling, data validation, resource limits and environment-specific driver behavior.

Comparison with Related Approaches

Common Beginner Mistakes

Key Takeaways

• Creates a prepared statement for repeated execution with bound values.
• Placeholders represent SQL values, not table or column identifiers.
• query runs SQL immediately; prepare separates SQL from input values.

Choose this API or pattern when its exact semantics match your task, and verify the result against the database driver and runtime used by your application.