protected function getPreAlterTableRenameIndexForeignKeySQL(TableDiff $diff)
{
$sql = array();
$tableName = $diff->getName($this)->getQuotedName($this);
foreach ($this->getRemainingForeignKeyConstraintsRequiringRenamedIndexes($diff) as $foreignKey) {
if (!in_array($foreignKey, $diff->changedForeignKeys, true)) {
$sql[] = $this->getDropForeignKeySQL($foreignKey, $tableName);
}
}
return $sql;
}