shmop_read
Description
The shmop_read of Shmop for PHP reads data from the shared memory block.
Syntax
shmop_read(
Shmop $shmop,
int $offset,
int $size
): stringParameters
shmop
The shared memory block identifier created by shmop_open().
offset
Offset from which to start reading; must be greater than or equal to zero and less than or equal to the actual size of the shared memory segment.
size
The number of bytes to read; must be greater than or equal to zero, and the sum of offset and size must be less than or equal to the actual size of the shared memory segment.
0 = shmop_size($shmop) - $offset
Return
Returns the data on success or false on failure.
Examples
1 · shmop offset · 0 · size · 0
<? $filename = __FILE__; $project_id = "t"; $key = ftok($filename, $project_id); $mode = "a"; $permissions = 0o644; $size = 16; $shmop = shmop_open($key, $mode, $permissions, $size); $offset = 0; $size = 0; $return = shmop_read($shmop, $offset, $size); var_dump($return); ?>
string(16) " mydata"
2 · shmop offset · 0 · size · 16
<? $filename = __FILE__; $project_id = "t"; $key = ftok($filename, $project_id); $mode = "a"; $permissions = 0o644; $size = 16; $shmop = shmop_open($key, $mode, $permissions, $size); $offset = 0; $size = 16; $return = shmop_read($shmop, $offset, $size); var_dump($return); ?>
true
3 · shmop offset · 10 · size · 0
<? $filename = __FILE__; $project_id = "t"; $key = ftok($filename, $project_id); $mode = "a"; $permissions = 0o644; $size = 16; $shmop = shmop_open($key, $mode, $permissions, $size); $offset = 10; $size = 0; $return = shmop_read($shmop, $offset, $size); var_dump($return); ?>
true
4 · shmop offset · 10 · size · 6
<? $filename = __FILE__; $project_id = "t"; $key = ftok($filename, $project_id); $mode = "a"; $permissions = 0o644; $size = 16; $shmop = shmop_open($key, $mode, $permissions, $size); $offset = 10; $size = 6; $return = shmop_read($shmop, $offset, $size); var_dump($return); ?>
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