Is it necessary to use the InnoDB engine for foreign keys in PHP, or can MyISAM be used instead?

When working with foreign keys in PHP, it is necessary to use the InnoDB storage engine as MyISAM does not support foreign keys. InnoDB is the recommended storage engine for databases that require foreign key constraints to maintain data integrity. By using InnoDB, you can ensure that the relationships between tables are enforced and maintained properly. 

// Create a table with foreign key constraint using InnoDB engine
$pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");
$pdo->exec("CREATE TABLE parent_table (
    id INT PRIMARY KEY,
    name VARCHAR(50)
) ENGINE=InnoDB");

$pdo->exec("CREATE TABLE child_table (
    id INT PRIMARY KEY,
    parent_id INT,
    FOREIGN KEY(parent_id) REFERENCES parent_table(id)
) ENGINE=InnoDB");

Keywords

InnoDB MyISAM foreign keys PHP database engine

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