PHP 5.4.31 Released

pg_unescape_bytea

(PHP 4 >= 4.3.0, PHP 5)

pg_unescape_bytea Unescape binary for bytea type

Descripción

string pg_unescape_bytea ( string $data )

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

Nota:

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.

Parámetros

data

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

Valores devueltos

A string containing the unescaped data.

Ejemplos

Ejemplo #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);
?>

Historial de cambios

Versión Descripción
5.5.1 A warning is thrown if the input string is invalid.

Ver también

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User Contributed Notes 3 notes

up
1
muralito at montevideo dot com dot uy
3 years ago
The workaround is to configure a property in the postgres database for the user, to make postgres behave as the old default.

ALTER USER username SET bytea_output = 'escape';

(or using the pgadmin interface)
up
1
liviu dot mirea at gmail dot com
3 years ago
PostgreSQL 9.0 introduced "hex" as the new default format for encoding binary data. Because "pg_unescape_bytea" only works with the old "escape" format, you need to do pg_query('SET bytea_output = "escape";'); before executing your select queries.

More details can be found here: http://www.postgresql.org/docs/9.0/static/datatype-binary.html
up
-1
tiagopastorello at gmail dot com
6 years ago
<?php
$conexao
= pg_connect("host=localhost dbname=name user=postgres password=123456") or die('Sorry =( : ' . pg_last_error());

$cod= $_GET['cod'];

$sql = "SELECT * FROM table WHERE cod_field = '$cod'";
$quer = pg_query($conexao, $sql);

$reg = pg_fetch_object($query);

print
pg_unescape_bytea($reg -> field_bytea);

?>
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