php mysql获取表字段名称和字段信息的三种方法

student_id [Type] => int(4) [Null] => NO [Key] => PRI [Default] => [Extra] => auto_increment ) Array ( [Field] => student_name [Type] => varchar(50) [Null] => NO [Key] => [Default] => [Extra] => ) Array ( [Field] => class_id [Type] => int(4) [Null] => NO [Key] => [Default] => [Extra] => ) Array ( [Field] => total_score [Type] => int(4) [Null] => NO [Key] => [Default] => [Extra] => )

student_id [Type] => int(4) [Collation] => [Null] => NO [Key] => PRI [Default] => [Extra] => auto_increment [Privileges] => select,insert,update,references [Comment] => ) Array ( [Field] => student_name [Type] => varchar(50) [Collation] => latin1_swedish_ci [Null] => NO [Key] => [Default] => [Extra] => [Privileges] => select,references [Comment] => ) Array ( [Field] => class_id [Type] => int(4) [Collation] => [Null] => NO [Key] => [Default] => [Extra] => [Privileges] => select,references [Comment] => ) Array ( [Field] => total_score [Type] => int(4) [Collation] => [Null] => NO [Key] => [Default] => [Extra] => [Privileges] => select,references [Comment] => )

student_id [table] => student [def] => [max_length] => 1 [not_null] => 1 [primary_key] => 1 [multiple_key] => 0 [unique_key] => 0 [numeric] => 1 [blob] => 0 [type] => int [unsigned] => 0 [zerofill] => 0 ) stdClass Object ( [name] => student_name [table] => student [def] => [max_length] => 5 [not_null] => 1 [primary_key] => 0 [multiple_key] => 0 [unique_key] => 0 [numeric] => 0 [blob] => 0 [type] => string [unsigned] => 0 [zerofill] => 0 ) stdClass Object ( [name] => class_id [table] => student [def] => [max_length] => 1 [not_null] => 1 [primary_key] => 0 [multiple_key] => 0 [unique_key] => 0 [numeric] => 1 [blob] => 0 [type] => int [unsigned] => 0 [zerofill] => 0 ) stdClass Object ( [name] => total_score [table] => student [def] => [max_length] => 3 [not_null] => 1 [primary_key] => 0 [multiple_key] => 0 [unique_key] => 0 [numeric] => 1 [blob] => 0 [type] => int [unsigned] => 0 [zerofill] => 0 )