pg_lo_read_all()
(PHP 4 >= 4.2.0, PHP 5, PHP 7)
读入整个大型对象并直接发送给浏览器
说明
pg_lo_read_all(resource $large_object): int
pg_lo_read_all()读入一个大型对象并在(PHP)发送完所有待发的 header 之后将其直接发送给浏览器。主要目的是发送图片或声音等二进制数据。返回值为读入的字节数,如果出错则返回FALSE
。
要使用大型对象(lo)接口,需要将其放置在事务块中。
Note:本函数以前的名字为pg_loreadall()。
参见pg_lo_read()。
// remember, large objects must be obtained from within a transaction pg_query ($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");
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.