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pg_unescape_bytea

(PHP 4 >= 4.3.0, PHP 5)

pg_unescape_bytea - Unescape binary for bytea type

Описание

string pg_unescape_bytea ( string data )

pg_unescape_bytea() unescapes PostgreSQL bytea data values. It returns the unescaped string, possibly containing binary data.

Замечание: When you SELECT a bytea type, PostgreSQL returns octal byte values prefixed with '\' (e.g. \032). Users are supposed to convert back to binary format manually.

This function requires PostgreSQL 7.2 or later. With PostgreSQL 7.2.0 and 7.2.1, bytea values must be cast when you enable multi-byte support. i.e. INSERT INTO test_table (image) VALUES ('$image_escaped'::bytea); PostgreSQL 7.2.2 or later does not need a cast. The exception is when the client and backend character encoding does not match, and there may be multi-byte stream error. User must then cast to bytea to avoid this error.

Список параметров

data

A string containing PostgreSQL bytea data to be converted into a PHP binary string.

Возвращаемые значения

A string containing the unescaped data.

Примеры

Пример 1. pg_unescape_bytea() example
  // Connect to the database
  $dbconn = pg_connect('dbname=foo');
  
  // Get the bytea data
  $res = pg_query("SELECT data FROM gallery WHERE name='Pine trees'");  
  $raw = pg_fetch_result($res, 'data');
  
  // Convert to binary and send to the browser
  header('Content-type: image/jpeg');
  echo pg_unescape_bytea($raw);

Смотрите также: pg_escape_bytea(), pg_escape_string().

Все функции PostgreSQL
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