pg_lo_read_all

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_lo_read_all — Legge interamente un large object e lo manda direttamente al browser

Descrizione

pg_lo_read_all(resource $large_object): int

pg_lo_read_all() legge un large object e lo passa direttamente al browser dopo aver inviato tutti gli header in attesa. È pensata principalmente per inviare dati binari, come immagini o suoni. Restituisce il numero di byte letti. Restituisce false in caso di errore.

Per utilizzare l'interfaccia large object (lo), occorre includere il comando in un blocco di transazione.

Nota:
Questa funzione si chiamava pg_loreadall().

Vedere anche pg_lo_read().

Improve This Page

Learn How To Improve This Page • Submit a Pull Request • Report a Bug

＋add a note

User Contributed Notes 2 notes

down

robert dot bernier5 at sympatico dot ca ¶

20 years ago

// remember, large objects must be obtained from within a transaction
pg_query ($dbconn, "begin");

// "assume" for this example that the large object resource number of the zipped file is "17899"

$lo_oid = 17899;

$handle_lo = pg_lo_open($dbconn,$lo_oid,"r") or die("<h1>Error.. can't get handle</h1>");

//headers to send to the browser before beginning the binary download
header('Accept-Ranges: bytes');
header('Content-Length: 32029974'); //this is the size of the zipped file
header('Keep-Alive: timeout=15, max=100');
header('Content-type: Application/x-zip');
header('Content-Disposition: attachment; filename="superjob.zip"');

pg_lo_read_all($handle_lo) or 
  die("<h1>Error, can't read large object.</h1>");

// committing the data transaction
pg_query ($dbconn, "commit");

down

fabar2 at libero dot it ¶

13 years ago

Pay attention that if you omit the "length" parameter it will read a 8192 bytes object regardless to its real dimensions. If you want to use this function think to save the object size somewhere (usually a field in its table) before reading the object. Alternatively use the pg_lo_readall function.

＋add a note