PHP 7.4.24 Released!

shmop_write

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

shmop_writeWrite data into shared memory block

Açıklama

shmop_write(Shmop $shmop, string $data, int $offset): int

shmop_write() will write a string into shared memory block.

Değiştirgeler

shmop

The shared memory block identifier created by shmop_open()

data

A string to write into shared memory block

offset

Specifies where to start writing data inside the shared memory segment.

Dönen Değerler

The size of the written data.

Sürüm Bilgisi

Sürüm: Açıklama
8.0.0 Prior to PHP 8.0.0, false was returned on failure.
8.0.0 shmop expects a Shmop instance now; previously, a resource was expected.

Örnekler

Örnek 1 Writing to shared memory block

<?php
$shm_bytes_written 
shmop_write($shm_id$my_string0);
?>

This example will write data inside $my_string into shared memory block, $shm_bytes_written will contain the number of bytes written.

Ayrıca Bakınız

add a note add a note

User Contributed Notes 1 note

up
0
radupb at yahoo dot com
9 months ago
I guess pack-unpack are the handy functions for encoding/decoding data as/from a binary string for shmop_write/shmop_read. Example:

$format='LLLLSSCCCC';  //data format for pack
$key=1;
if( !($shmid=shmop_open($key,'n',0660,30)) )
  die('shmop_open failed.');

//my data to encode:
$hd=array('ALIVE1'=>1,'ALIVE2'=>2,'ALIVE3'=>3,'ALIVE4'=>4,
      'CRTPTR'=>5,'CRTSEQ'=>6,
      'CTW'=>7,'LOCK'=>8,'PLAY'=>9,'MISS'=>10
);

$tmp=pack( $format, $hd['ALIVE1'],$hd['ALIVE2'],$hd['ALIVE3'],$hd['ALIVE4'],  $hd['CRTPTR'],$hd['CRTSEQ'],$hd['CTW'],$hd['LOCK'],$hd['PLAY'],$hd['MISS'] );

if( ($w=shmop_write($shmid,$tmp,0))!=24 )
  die('write error $w='.$w);

And reading from some other process:
$key=1;
if( !($shmid=shmop_open($key,'w',0,0)) )
  die('shmop_open failed.');

$formatR='L4ALIVE/SCRTPTR/SCRTSEQ/CCTW/CLOCK/CPLAY/CMISS'; //data format for unpack

$hd=unpack( $formatR, shmop_read( $shmid,0,24) );
echo'hd:<pre>';print_r($hd);echo'</pre>';
To Top