PostgreSQL Functions
PHP Manual


(PHP 4 >= 4.2.0, PHP 5, PHP 7)

pg_field_size Returns the internal storage size of the named field


int pg_field_size ( resource $result , int $field_number )

pg_field_size() returns the internal storage size (in bytes) of the field number in the given PostgreSQL result.


This function used to be called pg_fieldsize().



PostgreSQL query result resource, returned by pg_query(), pg_query_params() or pg_execute() (among others).


Field number, starting from 0.

Return Values

The internal field storage size (in bytes). -1 indicates a variable length field. FALSE is returned on error.


Example #1 Getting information about fields

pg_connect("dbname=publisher") or die("Could not connect");

$res pg_query($dbconn"select * from authors where author = 'Orwell'");
$i pg_num_fields($res);
  for (
$j 0$j $i$j++) {
"column $j\n";
$fieldname pg_field_name($res$j);
"fieldname: $fieldname\n";
"printed length: " pg_field_prtlen($res$fieldname) . " characters\n";
"storage length: " pg_field_size($res$j) . " bytes\n";
"field type: " pg_field_type($res$j) . " \n\n";

The above example will output:

column 0
fieldname: author
printed length: 6 characters
storage length: -1 bytes
field type: varchar 

column 1
fieldname: year
printed length: 4 characters
storage length: 2 bytes
field type: int2 

column 2
fieldname: title
printed length: 24 characters
storage length: -1 bytes
field type: varchar 

See Also

PostgreSQL Functions
PHP Manual