php
Duplicate key constraint violation
SQLSTATE\[23000\].*Integrity constraint violation.*Duplicate entry
Fixes
- 1.Use firstOrCreate() or updateOrCreate() instead of create()
- 2.Add unique validation rule before saving
- 3.Handle exception: try/catch QueryException
- 4.Use INSERT ... ON DUPLICATE KEY UPDATE for bulk operations
databaseconstraintunique
Related Errors
php4 fixes
Undefined variable used
Undefined variable.*\$
- •Initialize the variable before use
- •Check for typos in the variable name
php4 fixes
PHP class not found
Class ['"].*['"] not found
- •Run composer dump-autoload to regenerate autoload files
- •Check namespace matches directory structure (PSR-4)
php3 fixes
Database table does not exist
SQLSTATE\[42S02\].*Table.*doesn't exist
- •Run php artisan migrate to create the table
- •Check table name in migration matches what the model expects