shmop made simple:
$test=get_cache('test');
save_cache($test, 'test1', 600);
To save/get cache that easily just save this as cache.php or whatever you see fit:
<?php
function save_cache($data, $name, $timeout) {
 // delete cache
 $id=shmop_open(get_cache_id($name), "a", 0, 0);
 shmop_delete($id);
 shmop_close($id);
 
 // get id for name of cache
 $id=shmop_open(get_cache_id($name), "c", 0644, strlen(serialize($data)));
 
 // return int for data size or boolean false for fail
 if ($id) {
 set_timeout($name, $timeout);
 return shmop_write($id, serialize($data), 0);
 }
 else return false;
}
function get_cache($name) {
 if (!check_timeout($name)) {
 $id=shmop_open(get_cache_id($name), "a", 0, 0);
 if ($id) $data=unserialize(shmop_read($id, 0, shmop_size($id)));
 else return false; // failed to load data
 if ($data) { // array retrieved
 shmop_close();
 return $data;
 }
 else return false; // failed to load data
 }
 else return false; // data was expired
}
function get_cache_id($name) {
 // maintain list of caches here
 $id=array( 'test1' => 1
 'test2' => 2
 );
 return $id[$name];
}
function set_timeout($name, $int) {
 $timeout=new DateTime(date('Y-m-d H:i:s'));
 date_add($timeout, date_interval_create_from_date_string("$int seconds"));
 $timeout=date_format($timeout, 'YmdHis');
 $id=shmop_open(100, "a", 0, 0);
 if ($id) $tl=unserialize(shmop_read($id, 0, shmop_size($id)));
 else $tl=array();
 shmop_delete($id);
 shmop_close($id);
 $tl[$name]=$timeout;
 $id=shmop_open(100, "c", 0644, strlen(serialize($tl)));
 shmop_write($id, serialize($tl), 0);
}
function check_timeout($name) {
 $now=new DateTime(date('Y-m-d H:i:s'));
 $now=date_format($now, 'YmdHis');
 $id=shmop_open(100, "a", 0, 0);
 if ($id) $tl=unserialize(shmop_read($id, 0, shmop_size($id)));
 else return true;
 shmop_close($id);
 $timeout=$tl[$name];
 return (intval($now)>intval($timeout));
}
?>

thankyou,
this function had a missing comma between test1 and test2 and is fixed below
function get_cache_id($name) {
 // maintain list of caches here
 $id=array( 'test1' => 1,
 'test2' => 2
 );
 return $id[$name];
}