有毒的情况

mysqli_query查询

——-查询成功，有返回值——-

object(mysqli_result)#6 (5) { [“current_field”]=> int(0) [“field_count”]=> int(1) [“lengths”]=> NULL [“num_rows”]=> int(1) [“type”]=> int(0) } object(mysqli_result)#4 (5) { [“current_field”]=> int(0) [“field_count”]=> int(1) [“lengths”]=> NULL [“num_rows”]=> int(1) [“type”]=> int(0) } object(mysqli_result)#5 (5) { [“current_field”]=> int(0) [“field_count”]=> int(1) [“lengths”]=> NULL [“num_rows”]=> int(1) [“type”]=> int(0) }

———后两条查询失败———
object(mysqli_result)#4 (5) { [“current_field”]=> int(0) [“field_count”]=> int(1) [“lengths”]=> NULL [“num_rows”]=> int(1) [“type”]=> int(0) } bool(false) bool(false)