php 한글 메뉴얼 도움말 검색 사이트 Unescape binary for bytea type [function.pg-unescape-bytea]

설명

string pg_unescape_bytea ( string $data )

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

Note:
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.

인수

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

반환값

A string containing the unescaped data.

예제

Example #1 pg_unescape_bytea() example


<?php 
  // 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);
?>

변경점

버전	설명
5.5.1	A warning is thrown if the input string is invalid.

참고

pg_escape_bytea() - Escape a string for insertion into a bytea field
pg_escape_string() - Escape a string for query