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Description

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

Usage

$bool = check_column( $table_name, $col_name, $col_type, $is_null, $key, $default_value, $extra );

Parameters

$table_name

( string ) required – Database table name.

$col_name

( string ) required – Table column name.

$col_type

( string ) required – Table column type.

$is_null

( bool ) optional – Optional. Check is null.

$key

( mixed ) optional – Optional. Key info.

$default_value

( mixed ) optional – Optional. Default value.

$extra

( mixed ) optional – Optional. Extra value.

Returns

bool True, if matches. False, if not matching.

Source

File name: wordpress/wp-admin/install-helper.php

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->get_results( "DESC $table_name" );

  foreach ( $results as $row ) {

    if ( $row->Field === $col_name ) {

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

      if ( $diffs > 0 ) {
        return false;
      }

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

  return false;
}
 

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