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

Prints diagnostic information about a prepared statement and its parameters.

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

What It Does

Prints diagnostic information about a prepared statement and its parameters.

Syntax and Return Value

PDOStatement::debugDumpParams(): mixed

The return value and exceptional cases depend on the call described here: Debug output may contain SQL or sensitive values; do not expose it in production.

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);
ob_start(); $stmt->debugDumpParams(); $debug = ob_get_clean();
echo "Debug text length: " . strlen($debug);

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);
ob_start(); $stmt->debugDumpParams(); $debug = ob_get_clean();
echo "Debug text length: " . strlen($debug);

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);
ob_start(); $stmt->debugDumpParams(); $debug = ob_get_clean();
echo "Debug text length: " . strlen($debug);

Important Behavior and Edge Cases

Debug output may contain SQL or sensitive values; do not expose it in production.

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

• Prints diagnostic information about a prepared statement and its parameters.
• Debug output may contain SQL or sensitive values; do not expose it in production.
• errorInfo reports a statement failure rather than dumping its preparation state.

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.