vendor/illuminate/database/Schema/PostgresBuilder.php

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<?php

namespace Illuminate\Database\Schema;

class PostgresBuilder extends Builder
{
    /**
     * Determine if the given table exists.
     *
     * @param  string  $table
     * @return bool
     */
    public function hasTable($table)
    {
        [$schema, $table] = $this->parseSchemaAndTable($table);

        $table = $this->connection->getTablePrefix().$table;

        return count($this->connection->select(
            $this->grammar->compileTableExists(), [$schema, $table]
        )) > 0;
    }

    /**
     * Drop all tables from the database.
     *
     * @return void
     */
    public function dropAllTables()
    {
        $tables = [];

        $excludedTables = ['spatial_ref_sys'];

        foreach ($this->getAllTables() as $row) {
            $row = (array) $row;

            $table = reset($row);

            if (! in_array($table, $excludedTables)) {
                $tables[] = $table;
            }
        }

        if (empty($tables)) {
            return;
        }

        $this->connection->statement(
            $this->grammar->compileDropAllTables($tables)
        );
    }

    /**
     * Drop all views from the database.
     *
     * @return void
     */
    public function dropAllViews()
    {