What are the potential issues with using INSERT INTO statements for tables with foreign keys in PHP?

When using INSERT INTO statements for tables with foreign keys in PHP, the potential issue is that the foreign key constraint may be violated if the referenced key does not exist in the parent table. To solve this issue, you can disable foreign key checks before inserting the data and then re-enable them after the insertion is complete. 

// Disable foreign key checks
mysqli_query($conn, "SET FOREIGN_KEY_CHECKS = 0");

// Insert data into the table with foreign key
mysqli_query($conn, "INSERT INTO child_table (foreign_key_id, data) VALUES (1, 'example data')");

// Re-enable foreign key checks
mysqli_query($conn, "SET FOREIGN_KEY_CHECKS = 1");

Keywords

INSERT INTO foreign keys tables PHP issues

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