Add a workaround for PHP PDO SQLite bug (#79664) in PHP < 7.3

See also: php/php-src#5654

Author: JanJakes

tests/WP_SQLite_Driver_Tests.php

@@ -8170,4 +8170,29 @@ public function testColumnInfoWithZeroRows(): void {
 			$column_info
 		);
 	}
+
+	public function testColumnInfoWithZeroRowsPhpBug(): void {
+		if ( PHP_VERSION_ID < 70300 ) {
+			$this->markTestSkipped( 'Skipping due to PHP bug (#79664)' );
+		}
+
+		$this->assertQuery( 'CREATE TABLE t ( id INT )' );
+		$this->assertQuery( 'SELECT * FROM t' );
+		$this->assertEquals( 1, $this->engine->get_last_column_count() );
+		$column_info = $this->engine->get_last_column_meta();
+		$this->assertCount( 1, $column_info );
+		$this->assertSame(
+			array(
+				'native_type'      => 'LONG',
+				'pdo_type'         => PDO::PARAM_INT,
+				'flags'            => array(),
+				'table'            => 't',
+				'name'             => 'id',
+				'len'              => 11,
+				'precision'        => 0,
+				'sqlite:decl_type' => 'INTEGER',
+			),
+			$column_info[0]
+		);
+	}
 }

wp-includes/sqlite-ast/class-wp-sqlite-driver.php

@@ -1442,6 +1442,27 @@ private function execute_select_statement( WP_Parser_Node $node ): void {
 		// seems to erase type information for expressions in the SELECT clause.
 		$this->last_column_meta = array();
 		for ( $i = 0; $i < $stmt->columnCount(); $i++ ) {
+			/*
+			 * Workaround for PHP PDO SQLite bug (#79664) in PHP < 7.3.
+			 * See also: https://github.com/php/php-src/pull/5654
+			 */
+			if ( PHP_VERSION_ID < 70300 ) {
+				try {
+					$this->last_column_meta[] = $stmt->getColumnMeta( $i );
+				} catch ( Throwable $e ) {
+					$this->last_column_meta[] = array(
+						'native_type' => 'null',
+						'pdo_type'    => PDO::PARAM_NULL,
+						'flags'       => array(),
+						'table'       => '',
+						'name'        => '',
+						'len'         => -1,
+						'precision'   => 0,
+					);
+				}
+				continue;
+			}
+
 			$this->last_column_meta[] = $stmt->getColumnMeta( $i );
 		}