?<h3>D¨ızenle: install-helper.php</h3>
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/**
 * Plugins may load this file to gain access to special helper functions
 * for plugin installation. This file is not included by WordPress and it is
 * recommended, to prevent fatal errors, that this file is included using
 * require_once.
 *
 * These functions are not optimized for speed, but they should only be used
 * once in a while, so speed shouldn&#039;t be a concern. If it is and you are
 * needing to use these functions a lot, you might experience timeouts.
 * If you do, then it is advised to just write the SQL code yourself.
 *
 *     check_column( &#039;wp_links&#039;, &#039;link_description&#039;, &#039;mediumtext&#039; );
 *
 *     if ( check_column( $wpdb-&gt;comments, &#039;comment_author&#039;, &#039;tinytext&#039; ) ) {
 *         echo &quot;ok\n&quot;;
 *     }
 *
 *     // Check the column.
 *     if ( ! check_column( $wpdb-&gt;links, &#039;link_description&#039;, &#039;varchar( 255 )&#039; ) ) {
 *         $ddl = &quot;ALTER TABLE $wpdb-&gt;links MODIFY COLUMN link_description varchar(255) NOT NULL DEFAULT &#039;&#039; &quot;;
 *         $q = $wpdb-&gt;query( $ddl );
 *     }
 *
 *     $error_count = 0;
 *     $tablename   = $wpdb-&gt;links;
 *
 *     if ( check_column( $wpdb-&gt;links, &#039;link_description&#039;, &#039;varchar( 255 )&#039; ) ) {
 *         $res .= $tablename . &#039; - ok &lt;br /&gt;&#039;;
 *     } else {
 *         $res .= &#039;There was a problem with &#039; . $tablename . &#039;&lt;br /&gt;&#039;;
 *         ++$error_count;
 *     }
 *
 * @package WordPress
 * @subpackage Plugin
 */

/** Load WordPress Bootstrap */
require_once dirname( __DIR__ ) . &#039;/wp-load.php&#039;;

if ( ! function_exists( &#039;maybe_create_table&#039; ) ) :
	/**
	 * Creates a table in the database if it doesn&#039;t already exist.
	 *
	 * @since 1.0.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param string $table_name Database table name.
	 * @param string $create_ddl SQL statement to create table.
	 * @return bool True on success or if the table already exists. False on failure.
	 */
	function maybe_create_table( $table_name, $create_ddl ) {
		global $wpdb;

		foreach ( $wpdb-&gt;get_col( &#039;SHOW TABLES&#039;, 0 ) as $table ) {
			if ( $table === $table_name ) {
				return true;
			}
		}

		// Didn&#039;t find it, so try to create it.
		// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- No applicable variables for this query.
		$wpdb-&gt;query( $create_ddl );

		// We cannot directly tell whether this succeeded!
		foreach ( $wpdb-&gt;get_col( &#039;SHOW TABLES&#039;, 0 ) as $table ) {
			if ( $table === $table_name ) {
				return true;
			}
		}

		return false;
	}
endif;

if ( ! function_exists( &#039;maybe_add_column&#039; ) ) :
	/**
	 * Adds column to database table, if it doesn&#039;t already exist.
	 *
	 * @since 1.0.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param string $table_name  Database table name.
	 * @param string $column_name Table column name.
	 * @param string $create_ddl  SQL statement to add column.
	 * @return bool True on success or if the column already exists. False on failure.
	 */
	function maybe_add_column( $table_name, $column_name, $create_ddl ) {
		global $wpdb;

		// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names.
		foreach ( $wpdb-&gt;get_col( &quot;DESC $table_name&quot;, 0 ) as $column ) {
			if ( $column === $column_name ) {
				return true;
			}
		}

		// Didn&#039;t find it, so try to create it.
		// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- No applicable variables for this query.
		$wpdb-&gt;query( $create_ddl );

		// We cannot directly tell whether this succeeded!
		// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names.
		foreach ( $wpdb-&gt;get_col( &quot;DESC $table_name&quot;, 0 ) as $column ) {
			if ( $column === $column_name ) {
				return true;
			}
		}

		return false;
	}
endif;

/**
 * Drops column from database table, if it exists.
 *
 * @since 1.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $table_name  Database table name.
 * @param string $column_name Table column name.
 * @param string $drop_ddl    SQL statement to drop column.
 * @return bool True on success or if the column doesn&#039;t exist. False on failure.
 */
function maybe_drop_column( $table_name, $column_name, $drop_ddl ) {
	global $wpdb;

	// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names.
	foreach ( $wpdb-&gt;get_col( &quot;DESC $table_name&quot;, 0 ) as $column ) {
		if ( $column === $column_name ) {

			// Found it, so try to drop it.
			// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- No applicable variables for this query.
			$wpdb-&gt;query( $drop_ddl );

			// We cannot directly tell whether this succeeded!
			// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names.
			foreach ( $wpdb-&gt;get_col( &quot;DESC $table_name&quot;, 0 ) as $column ) {
				if ( $column === $column_name ) {
					return false;
				}
			}
		}
	}

	// Else didn&#039;t find it.
	return true;
}

/**
 * Checks that database table column matches the criteria.
 *
 * Uses the SQL DESC for retrieving the table info for the column. It will help
 * understand the parameters, if you do more research on what column information
 * is returned by the SQL statement. Pass in null to skip checking that criteria.
 *
 * Column names returned from DESC table are case sensitive and are as listed:
 *
 *  - Field
 *  - Type
 *  - Null
 *  - Key
 *  - Default
 *  - Extra
 *
 * @since 1.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $table_name    Database table name.
 * @param string $col_name      Table column name.
 * @param string $col_type      Table column type.
 * @param bool   $is_null       Optional. Check is null.
 * @param mixed  $key           Optional. Key info.
 * @param mixed  $default_value Optional. Default value.
 * @param mixed  $extra         Optional. Extra value.
 * @return bool True, if matches. False, if not matching.
 */
function check_column( $table_name, $col_name, $col_type, $is_null = null, $key = null, $default_value = null, $extra = null ) {
	global $wpdb;

	$diffs = 0;

	// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names.
	$results = $wpdb-&gt;get_results( &quot;DESC $table_name&quot; );

	foreach ( $results as $row ) {

		if ( $row-&gt;Field === $col_name ) {

			// Got our column, check the params.
			if ( ( null !== $col_type ) &amp;&amp; ( $row-&gt;Type !== $col_type ) ) {
				++$diffs;
			}
			if ( ( null !== $is_null ) &amp;&amp; ( $row-&gt;Null !== $is_null ) ) {
				++$diffs;
			}
			if ( ( null !== $key ) &amp;&amp; ( $row-&gt;Key !== $key ) ) {
				++$diffs;
			}
			if ( ( null !== $default_value ) &amp;&amp; ( $row-&gt;Default !== $default_value ) ) {
				++$diffs;
			}
			if ( ( null !== $extra ) &amp;&amp; ( $row-&gt;Extra !== $extra ) ) {
				++$diffs;
			}

			if ( $diffs &gt; 0 ) {
				return false;
			}

			return true;
		} // End if found our column.
	}

	return false;
}
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