shmop_read

Read data from shared memory block (PHP 4 >= 4.0.4, PHP 5)
string shmop_read ( int shmid, int start, int count )

shmop_read() will read a string from shared memory block.

Parameters

shmid: The shared memory block identifier created by shmop_open()
start: Offset from which to start reading
count: The number of bytes to read

Return Values

Returns the data or FALSE on failure.

Examples

Example 2234. Reading shared memory block

copy to clipboard

<?php

$shm_data = shmop_read($shm_id, 0, 50);
?>

This example will read 50 bytes from shared memory block and place the data inside $shm_data.

Code Examples / Notes » shmop_read

macmaster

When i need to read the whole string at that shm pointer, setting the count parameter to zero (0) seems work for me.

craig manley

shmop_read() reads and returns the whole memory segment's data. This is not useful if you're just working with strings. If you need to read a string from shared memory, call str_from_mem() on the result of shmop_read(). Similarly when writing strings to memory (instead of binary data), null terminate your strings with str_to_nts() before passing the value on to shmop_write(). function str_to_nts($value) { return "$value\0"; } function str_from_mem(&$value) { $i = strpos($value, "\0"); if ($i === false) { return $value; } $result = substr($value, 0, $i); return $result; }

slavapl

Also you can use the shmop_size() function to determine the block size.

Change Language

shmop_close
shmop_delete
shmop_open
shmop_read
shmop_size
shmop_write