PHP PDOStatement::bindValue() Method: Usage and Examples

Binds a fixed value to a parameter placeholder.

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

What It Does

Binds a fixed value to a parameter placeholder.

Syntax and Return Value

PDOStatement::bindValue(Parameter #0 [ <required> string|int $param ], Parameter #1 [ <required> mixed $value ], Parameter #2 [ <optional> int $type = PDO::PARAM_STR ]): mixed

The return value and exceptional cases depend on the call described here: Use PDO::PARAM_INT for integer LIMIT parameters and PDO::PARAM_NULL for SQL NULL.

Example 1: Basic Use

The statement has a real query and result set; database-specific metadata and statement options may be unsupported.

<?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->bindValue(":id", 1, PDO::PARAM_INT);
$stmt->execute();
echo $stmt->fetchColumn();

Example 2: A Second Scenario

The statement has a real query and result set; database-specific metadata and statement options may be unsupported.

<?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->bindValue(":id", 2, PDO::PARAM_INT);
$stmt->execute();
echo $stmt->fetchColumn();

Example 3: Practical Checks

The statement has a real query and result set; database-specific metadata and statement options may be unsupported.

<?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->bindValue(":id", 3, PDO::PARAM_INT);
$stmt->execute();
echo $stmt->fetchColumn();

Important Behavior and Edge Cases

Use PDO::PARAM_INT for integer LIMIT parameters and PDO::PARAM_NULL for SQL NULL.

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

• Binds a fixed value to a parameter placeholder.
• Use PDO::PARAM_INT for integer LIMIT parameters and PDO::PARAM_NULL for SQL NULL.
• bindParam binds a variable by reference, allowing its value to change before execute.

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.