Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
| 1 | <?php  | 
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| 23 | class Give_Tools_Reset_Stats extends Give_Batch_Export { | 
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| 24 | |||
| 25 | /**  | 
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| 26 | * Our export type. Used for export-type specific filters/actions  | 
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| 27 | *  | 
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| 28 | * @var string  | 
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| 29 | * @since 1.5  | 
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| 30 | */  | 
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| 31 | public $export_type = '';  | 
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| 32 | |||
| 33 | /**  | 
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| 34 | * Allows for a non-form batch processing to be run.  | 
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| 35 | *  | 
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| 36 | * @since 1.5  | 
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| 37 | * @var boolean  | 
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| 38 | */  | 
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| 39 | public $is_void = true;  | 
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| 40 | |||
| 41 | /**  | 
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| 42 | * Sets the number of items to pull on each step  | 
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| 43 | *  | 
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| 44 | * @since 1.5  | 
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| 45 | * @var integer  | 
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| 46 | */  | 
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| 47 | public $per_step = 30;  | 
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| 48 | |||
| 49 | /**  | 
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| 50 | * Get the Export Data  | 
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| 51 | *  | 
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| 52 | * @access public  | 
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| 53 | * @since 1.5  | 
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| 54 | * @global object $wpdb Used to query the database using the WordPress  | 
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| 55 | * Database API  | 
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| 56 | * @return bool $data The data for the CSV file  | 
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| 57 | */  | 
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| 58 | 	public function get_data() { | 
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| 59 | global $wpdb;  | 
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| 60 | |||
| 61 | $items = $this->get_stored_data( 'give_temp_reset_ids' );  | 
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| 62 | |||
| 63 | 		if ( ! is_array( $items ) ) { | 
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| 64 | return false;  | 
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| 65 | }  | 
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| 66 | |||
| 67 | $offset = ( $this->step - 1 ) * $this->per_step;  | 
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| 68 | $step_items = array_slice( $items, $offset, $this->per_step );  | 
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| 69 | |||
| 70 | 		if ( $step_items ) { | 
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                         | 
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| 71 | |||
| 72 | $step_ids = array(  | 
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| 73 | 'customers' => array(),  | 
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| 74 | 'forms' => array(),  | 
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| 75 | 'other' => array(),  | 
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| 76 | );  | 
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| 77 | |||
| 78 | 			foreach ( $step_items as $item ) { | 
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| 79 | |||
| 80 | 				switch ( $item['type'] ) { | 
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| 81 | case 'customer':  | 
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| 82 | $step_ids['customers'][] = $item['id'];  | 
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| 83 | break;  | 
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| 84 | case 'forms':  | 
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| 85 | $step_ids['give_forms'][] = $item['id'];  | 
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| 86 | break;  | 
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| 87 | default:  | 
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| 88 | $item_type = apply_filters( 'give_reset_item_type', 'other', $item );  | 
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| 89 | $step_ids[ $item_type ][] = $item['id'];  | 
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| 90 | break;  | 
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| 91 | }  | 
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| 92 | }  | 
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| 93 | |||
| 94 | $sql = array();  | 
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| 95 | |||
| 96 | 			foreach ( $step_ids as $type => $ids ) { | 
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| 97 | |||
| 98 | 				if ( empty( $ids ) ) { | 
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| 99 | continue;  | 
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| 100 | }  | 
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| 101 | |||
| 102 | $ids = implode( ',', $ids );  | 
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| 103 | |||
| 104 | 				switch ( $type ) { | 
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| 105 | case 'customers':  | 
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| 106 | $table_name = $wpdb->prefix . 'give_customers';  | 
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| 107 | $meta_table_name = $wpdb->prefix . 'give_customermeta';  | 
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| 108 | $sql[] = "DELETE FROM $table_name WHERE id IN ($ids)";  | 
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| 109 | $sql[] = "DELETE FROM $meta_table_name WHERE customer_id IN ($ids)";  | 
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| 110 | break;  | 
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| 111 | case 'forms':  | 
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| 112 | $sql[] = "UPDATE $wpdb->postmeta SET meta_value = 0 WHERE meta_key = '_give_form_sales' AND post_id IN ($ids)";  | 
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| 113 | $sql[] = "UPDATE $wpdb->postmeta SET meta_value = 0.00 WHERE meta_key = '_give_form_earnings' AND post_id IN ($ids)";  | 
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| 114 | break;  | 
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| 115 | case 'other':  | 
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| 116 | $sql[] = "DELETE FROM $wpdb->posts WHERE id IN ($ids)";  | 
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| 117 | $sql[] = "DELETE FROM $wpdb->postmeta WHERE post_id IN ($ids)";  | 
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| 118 | $sql[] = "DELETE FROM $wpdb->comments WHERE comment_post_ID IN ($ids)";  | 
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| 119 | $sql[] = "DELETE FROM $wpdb->commentmeta WHERE comment_id NOT IN (SELECT comment_ID FROM $wpdb->comments)";  | 
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| 120 | break;  | 
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| 121 | }  | 
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| 122 | |||
| 123 | 				if ( ! in_array( $type, array( 'customers', 'forms', 'other' ) ) ) { | 
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| 124 | // Allows other types of custom post types to filter on their own post_type  | 
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| 125 | // and add items to the query list, for the IDs found in their post type.  | 
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| 126 | 					$sql = apply_filters( "give_reset_add_queries_{$type}", $sql, $ids ); | 
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| 127 | }  | 
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| 128 | }  | 
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| 129 | |||
| 130 | 			if ( ! empty( $sql ) ) { | 
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| 131 | 				foreach ( $sql as $query ) { | 
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| 132 | $wpdb->query( $query );  | 
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| 133 | }  | 
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| 134 | }  | 
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| 135 | |||
| 136 | return true;  | 
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| 137 | |||
| 138 | }// End if().  | 
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| 139 | |||
| 140 | return false;  | 
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| 141 | |||
| 142 | }  | 
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| 143 | |||
| 144 | /**  | 
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| 145 | * Return the calculated completion percentage.  | 
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| 146 | *  | 
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| 147 | * @since 1.5  | 
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| 148 | * @return int  | 
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| 149 | */  | 
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| 150 | View Code Duplication | 	public function get_percentage_complete() { | 
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| 151 | |||
| 152 | $items = $this->get_stored_data( 'give_temp_reset_ids' );  | 
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| 153 | $total = count( $items );  | 
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| 154 | |||
| 155 | $percentage = 100;  | 
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| 156 | |||
| 157 | 		if ( $total > 0 ) { | 
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| 158 | $percentage = ( ( $this->per_step * $this->step ) / $total ) * 100;  | 
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| 159 | }  | 
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| 160 | |||
| 161 | 		if ( $percentage > 100 ) { | 
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| 162 | $percentage = 100;  | 
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| 163 | }  | 
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| 164 | |||
| 165 | return $percentage;  | 
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| 166 | }  | 
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| 167 | |||
| 168 | /**  | 
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| 169 | * Set the properties specific to the payments export.  | 
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| 170 | *  | 
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| 171 | * @since 1.5  | 
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| 172 | *  | 
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| 173 | * @param array $request The Form Data passed into the batch processing.  | 
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| 174 | */  | 
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| 175 | 	public function set_properties( $request ) { | 
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| 176 | }  | 
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| 177 | |||
| 178 | /**  | 
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| 179 | * Process a step  | 
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| 180 | *  | 
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| 181 | * @since 1.5  | 
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| 182 | * @return bool  | 
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| 183 | */  | 
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| 184 | 	public function process_step() { | 
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| 185 | |||
| 186 | 		if ( ! $this->can_export() ) { | 
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| 187 | wp_die( esc_html__( 'You do not have permission to reset data.', 'give' ), esc_html__( 'Error', 'give' ), array(  | 
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| 188 | 'response' => 403,  | 
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| 189 | ) );  | 
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| 190 | }  | 
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| 191 | |||
| 192 | $had_data = $this->get_data();  | 
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| 193 | |||
| 194 | 		if ( $had_data ) { | 
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| 195 | $this->done = false;  | 
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| 196 | |||
| 197 | return true;  | 
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| 198 | 		} else { | 
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| 199 | update_option( 'give_earnings_total', 0 );  | 
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| 200 | Give_Cache::delete( Give_Cache::get_key( 'give_estimated_monthly_stats' ) );  | 
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| 201 | |||
| 202 | $this->delete_data( 'give_temp_reset_ids' );  | 
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| 203 | |||
| 204 | // Reset the sequential order numbers  | 
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| 205 | 			if ( give_get_option( 'enable_sequential' ) ) { | 
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| 206 | delete_option( 'give_last_payment_number' );  | 
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| 207 | }  | 
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| 208 | |||
| 209 | $this->done = true;  | 
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| 210 | $this->message = esc_html__( 'Donation forms, income, donations counts, and logs successfully reset.', 'give' );  | 
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| 211 | |||
| 212 | return false;  | 
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| 213 | }  | 
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| 214 | }  | 
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| 215 | |||
| 216 | /**  | 
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| 217 | * Headers  | 
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| 218 | */  | 
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| 219 | 	public function headers() { | 
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| 220 | give_ignore_user_abort();  | 
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| 221 | }  | 
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| 222 | |||
| 223 | /**  | 
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| 224 | * Perform the export  | 
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| 225 | *  | 
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| 226 | * @access public  | 
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| 227 | * @since 1.5  | 
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| 228 | * @return void  | 
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| 229 | */  | 
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| 230 | 	public function export() { | 
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| 237 | |||
| 238 | /**  | 
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| 239 | * Pre Fetch  | 
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| 240 | */  | 
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| 241 | 	public function pre_fetch() { | 
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| 242 | |||
| 288 | |||
| 289 | /**  | 
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| 290 | * Given a key, get the information from the Database Directly.  | 
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| 291 | *  | 
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| 292 | * @since 1.5  | 
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| 293 | *  | 
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| 294 | * @param string $key The option_name  | 
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| 295 | *  | 
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| 296 | * @return mixed Returns the data from the database.  | 
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| 297 | */  | 
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| 298 | View Code Duplication | 	private function get_stored_data( $key ) { | 
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| 313 | |||
| 314 | /**  | 
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| 315 | * Give a key, store the value.  | 
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| 316 | *  | 
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| 317 | * @since 1.5  | 
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| 318 | *  | 
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| 319 | * @param string $key The option_name.  | 
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| 320 | * @param mixed $value The value to store.  | 
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| 321 | *  | 
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| 322 | * @return void  | 
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| 323 | */  | 
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| 324 | View Code Duplication | 	private function store_data( $key, $value ) { | 
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| 343 | |||
| 344 | /**  | 
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| 345 | * Delete an option  | 
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| 346 | *  | 
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| 347 | * @since 1.5  | 
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| 348 | *  | 
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| 349 | * @param string $key The option_name to delete  | 
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| 350 | *  | 
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| 351 | * @return void  | 
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| 352 | */  | 
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| 353 | 	private function delete_data( $key ) { | 
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| 359 | |||
| 360 | }  | 
            
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.