假设你的表名是“events”，试试这个：

Schema::getConnection()
    ->getDoctrineSchemaManager()
    ->listTableForeignKeys('events')

这将返回Doctrine\DBAL\Schema\ForeignKeyConstraint对象。
有了这些数据，你可以像这样写isFK方法：

use Illuminate\Support\Facades\Schema;

function isFK(string $table, string $column): bool
{  
    $fkColumns = Schema::getConnection()
        ->getDoctrineSchemaManager()
        ->listTableForeignKeys($table);

    return collect($fkColumns)->map(function ($fkColumn) {
        return $fkColumn->getColumns();
    })->flatten()->contains($column);
}

我创建了这个Trait来用于我的迁移：

<?php 

namespace App\Traits;

use Illuminate\Support\Facades\Schema;

trait ChecksForeignKeys {
    /**
     * Check if a foreign key exists
     *
     * @param string $table
     * @param string $column
     * @param string $foreignTable
     * @param string $foreignColumn
     * @param string $connection
     * @return boolean
     */
    public function hasForegin($table, $column, $foreignTable, $foreignColumn, $connection = null) {

        // Get the foreign keys for the table
        $fkColumns = Schema::getConnection()
        ->getDoctrineSchemaManager()
        ->listTableForeignKeys($table);

        // Check if the foreign key exists
        foreach($fkColumns as $fkColumn) {            
            if($fkColumn->getLocalColumns()[0] == $column && $fkColumn->getForeignColumns()[0] == $foreignColumn && $fkColumn->getForeignTableName() == $foreignTable) {
                return true;
            }
        }

        return false;        
    }
}