pg_field_size
(PHP 4 >= 4.2.0, PHP 5, PHP 7)
pg_field_size - 返回指定字段的内部存储大小
描述
int pg_field_size ( resource $result , int $field_number ) pg_field_size（）返回给定PostgreSQL中字段号的内部存储大小（以字节为单位）result。
注意：这个函数被称为pg_fieldsize（）。
参数
result
PostgreSQL查询结果资源，由pg_query（），pg_query_params（）或pg_execute（）等返回。
field_number
字段编号，从0开始。
返回值
内部字段存储大小（以字节为单位）。-1表示可变长度字段。FALSE错误返回。
例子
Example #1 Getting information about fields
<?php
$dbconn = 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++) {
echo "column $j\n";
$fieldname = pg_field_name($res, $j);
echo "fieldname: $fieldname\n";
echo "printed length: " . pg_field_prtlen($res, $fieldname) . " characters\n";
echo "storage length: " . pg_field_size($res, $j) . " bytes\n";
echo "field type: " . pg_field_type($res, $j) . " \n\n";
}
?>上面的例子将输出：
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
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