php man page for mysql_fetch_field

MYSQL_FETCH_FIELD(3)							 1						      MYSQL_FETCH_FIELD(3)

mysql_fetch_field - Get column information from a result and return as an object

SYNOPSIS
       Warning

	      This  extension  is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should
	      be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:

		     omysqli_fetch_field(3)

		     o PDOStatement::getColumnMeta

       object mysql_fetch_field (resource  $result, [int  $field_offset])

DESCRIPTION
	Returns an object containing field information. This function can be used to obtain information about fields in the provided query result.

	      o $
		result -The result resource that is being evaluated. This result comes from a call to mysql_query(3).

	      o $field_offset
		- The numerical field offset. If the field offset is not specified, the next field that was not yet retrieved by this function	is
		retrieved. The $field_offset starts at 0.

	Returns an object containing field information. The properties of the object are:

	      o name - column name

	      o table - name of the table the column belongs to, which is the alias name if one is defined

	      o max_length - maximum length of the column

	      o not_null - 1 if the column cannot be
		NULL

	      o primary_key - 1 if the column is a primary key

	      o unique_key - 1 if the column is a unique key

	      o multiple_key - 1 if the column is a non-unique key

	      o numeric - 1 if the column is numeric

	      o blob - 1 if the column is a BLOB

	      o type - the type of the column

	      o unsigned - 1 if the column is unsigned

	      o zerofill - 1 if the column is zero-filled

       Example #1

	      mysql_fetch_field(3) example

	      <?php
	      $conn = mysql_connect('localhost', 'mysql_user', 'mysql_password');
	      if (!$conn) {
		  die('Could not connect: ' . mysql_error());
	      }
	      mysql_select_db('database');
	      $result = mysql_query('select * from table');
	      if (!$result) {
		  die('Query failed: ' . mysql_error());
	      }
	      /* get column metadata */
	      $i = 0;
	      while ($i < mysql_num_fields($result)) {
		  echo "Information for column $i:<br />
";
		  $meta = mysql_fetch_field($result, $i);
		  if (!$meta) {
		      echo "No information available<br />
";
		  }
		  echo "<pre>
	      blob:	    $meta->blob
	      max_length:   $meta->max_length
	      multiple_key: $meta->multiple_key
	      name:	    $meta->name
	      not_null:     $meta->not_null
	      numeric:	    $meta->numeric
	      primary_key:  $meta->primary_key
	      table:	    $meta->table
	      type:	    $meta->type
	      unique_key:   $meta->unique_key
	      unsigned:     $meta->unsigned
	      zerofill:     $meta->zerofill
	      </pre>";
		  $i++;
	      }
	      mysql_free_result($result);
	      ?>

       Note

	      Field names returned by this function are case-sensitive.

       Note

	       If  field  or  tablenames  are  aliased	in the SQL query the aliased name will be returned. The original name can be retrieved for
	      instance by using mysqli_result::fetch_field.

       mysql_field_seek(3).

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