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Unescape binary for bytea type


pg_unescape_bytea

(PHP 4 >= 4.3.0, PHP 5)

pg_unescape_bytea Unescape binary for bytea type

Description

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.

Parameters

data

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

Return Values

A string containing the unescaped data.

Examples

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);
?>

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