Re[2]: [PHP] Best way to use other objects within classes?
Hi,
Here it is for anyone that would like to try it.
?php
if(preg_match('/^win/i',PHP_OS)){
define('OS_SEP','\\');
define('OS_JOIN',';');
}else{
define('OS_SEP','/');
define('OS_JOIN',':');
}
class classLoader {
function loadLib($library=''){
if(!empty($library)){
$file = $GLOBALS['class_dir'].$library.'.lib';
if(!file_exists($file)){
$paths = split(OS_JOIN,ini_get('include_path'));
$found = false;
while(!$found list($key,$val) = each($paths)){
$file = $val.OS_SEP.$library.'.lib';
$found = file_exists($file);
}
}
if($found) include($file);
}
$array = get_declared_classes();
foreach($array as $classname){
if(!isset($GLOBALS['loaded_classes'][$classname]))
$GLOBALS['loaded_classes'][$classname] = array();
}
if(isset($start_classes) is_array($start_classes)){
foreach($start_classes as $class=$info){
$class_name = strtolower($class);
$name = $info['name'];
$hash = mhash(MHASH_TIGER,serialize($info['vars']));
if(isset($GLOBALS['loaded_classes'][$class_name])){
$varcount = count($info['vars']);
$vars = '$GLOBALS[\'loaded_classes\'][$class_name][$name][\'class\']
= new '.$class.'(';
if($varcount 0){
for ($i = 0; $i $varcount; $i++) {
$vars .= ($i 0)? ',':'';
$varname = 'variable'.$i;
$$varname = $info['vars'][$i];
$vars .= \$$varname;
}
}
$vars .= ');';
eval($vars);
$GLOBALS['loaded_classes'][$class_name][$name]['hash'] = $hash;
if(!empty($info['global'])) $GLOBALS[$info['global']] =
$GLOBALS['loaded_classes'][$class_name][$name]['class'];
}
}
unset($start_classes);
}
}
function load($class,$name=''){
$class_name = strtolower($class);
$name = (empty($name))? $class:$name;
$num_args = func_num_args();
$arg_list = func_get_args();
$hash = mhash(MHASH_TIGER,serialize($arg_list));
if(isset($GLOBALS['loaded_classes'][$class_name][$name])){
if($num_args 2
$GLOBALS['loaded_classes'][$class_name][$name]['hash'] != $hash){
$vars =
'$GLOBALS[\'loaded_classes\'][$class_name][$name][\'class\']-'.$class.'(';
for ($i = 2; $i $num_args; $i++) {
$vars .= ($i 2)? ',':'';
$varname = 'variable'.$i;
$$varname = $arg_list[$i];
$vars .= \$$varname;
}
$vars .= ');';
eval($vars);
$GLOBALS['loaded_classes'][$class_name][$name]['hash'] = $hash;
}
return $GLOBALS['loaded_classes'][$class_name][$name]['class'];
}elseif(!isset($GLOBALS['loaded_classes'][$class_name])){
$file = $GLOBALS['class_dir'].$class.'.inc';
if(!file_exists($file)){
$paths = split(OS_JOIN,ini_get('include_path'));
$found = false;
while(!$found list($key,$val) = each($paths)){
$file = $val.OS_SEP.$class.'.inc';
$found = file_exists($file);
}
}else $found = true;
if($found){
include($file);
classLoader::loadLib();
}
}
if(isset($GLOBALS['loaded_classes'][$class_name])){
$vars = '$GLOBALS[\'loaded_classes\'][$class_name][$name][\'class\'] =
new '.$class.'(';
if($num_args 2) {
for ($i = 2; $i $num_args; $i++) {
$vars .= ($i 2)? ',':'';
$varname = 'variable'.$i;
$$varname = $arg_list[$i];
$vars .= \$$varname;
}
}
$vars .= ');';
eval($vars);
$GLOBALS['loaded_classes'][$class_name][$name]['hash'] = $hash;
return $GLOBALS['loaded_classes'][$class_name][$name]['class'];
}
return false;
}
function remove($class,$name=''){
$r = false;
$class_name = strtolower($class);
$name = (empty($name))? $class:$name;
if(isset($GLOBALS['loaded_classes'][$class_name][$name])){
unset($GLOBALS['loaded_classes'][$class_name][$name]);
$r = true;
}
return $r;
}
function find($class,$name){
$class_name = strtolower($class);
if(isset($GLOBALS['loaded_classes'][$class_name][$name])){
return $GLOBALS['loaded_classes'][$class_name][$name]['class'];
}else{
return false;
}
}
}
//Usage
// not tested in php5
// all class files end in .inc
// all library files end in .lib
// I don't instanciate the class so uou just
// need to set 2 global variables them call loadLib()
// without any args to get a list of already loaded classes.
$class_dir = '/usr/local/apache/phpinc';
$loaded_classes = array();
classLoader::loadLib();
// The load a class giving it a name and any args that it needs,
// it can pass references without problem
// for example I have a Mysql table class I use just about everywhere
// which needs the db and table to use
$table = classLoader::load('tableClass','members','testdb','test_table');
// now I can get that same
Re[3]: [PHP] Best way to use other objects within classes?
Hi,
Sunday, June 26, 2005, 12:27:44 PM, you wrote:
TR Hi,
TR Here it is for anyone that would like to try it.
TR ?php
TR if(preg_match('/^win/i',PHP_OS)){
TR define('OS_SEP','\\');
TR define('OS_JOIN',';');
TR }else{
TR define('OS_SEP','/');
TR define('OS_JOIN',':');
TR }
TR class classLoader {
TR function loadLib($library=''){
TR if(!empty($library)){
TR $file = $GLOBALS['class_dir'].$library.'.lib';
TR if(!file_exists($file)){
TR $paths = split(OS_JOIN,ini_get('include_path'));
TR $found = false;
TR while(!$found list($key,$val) = each($paths)){
TR $file = $val.OS_SEP.$library.'.lib';
TR $found = file_exists($file);
TR }
TR }
TR if($found) include($file);
TR }
TR $array = get_declared_classes();
TR foreach($array as $classname){
TR if(!isset($GLOBALS['loaded_classes'][$classname]))
TR $GLOBALS['loaded_classes'][$classname] = array();
TR }
TR if(isset($start_classes) is_array($start_classes)){
TR foreach($start_classes as $class=$info){
TR $class_name = strtolower($class);
TR $name = $info['name'];
TR $hash = mhash(MHASH_TIGER,serialize($info['vars']));
TR if(isset($GLOBALS['loaded_classes'][$class_name])){
TR $varcount = count($info['vars']);
TR $vars =
TR '$GLOBALS[\'loaded_classes\'][$class_name][$name][\'class\'] =
TR new '.$class.'(';
TR if($varcount 0){
TR for ($i = 0; $i $varcount; $i++) {
TR $vars .= ($i 0)? ',':'';
TR $varname = 'variable'.$i;
TR $$varname = $info['vars'][$i];
TR $vars .= \$$varname;
TR }
TR }
TR $vars .= ');';
TR eval($vars);
TR
TR $GLOBALS['loaded_classes'][$class_name][$name]['hash'] = $hash;
TR if(!empty($info['global']))
TR $GLOBALS[$info['global']] =
TR $GLOBALS['loaded_classes'][$class_name][$name]['class'];
TR }
TR }
TR unset($start_classes);
TR }
TR }
TR function load($class,$name=''){
TR $class_name = strtolower($class);
TR $name = (empty($name))? $class:$name;
TR $num_args = func_num_args();
TR $arg_list = func_get_args();
TR $hash = mhash(MHASH_TIGER,serialize($arg_list));
TR if(isset($GLOBALS['loaded_classes'][$class_name][$name])){
TR if($num_args 2
TR $GLOBALS['loaded_classes'][$class_name][$name]['hash'] != $hash){
TR $vars =
TR '$GLOBALS[\'loaded_classes\'][$class_name][$name][\'class\']-'.$class.'(';
TR for ($i = 2; $i $num_args; $i++) {
TR $vars .= ($i 2)? ',':'';
TR $varname = 'variable'.$i;
TR $$varname = $arg_list[$i];
TR $vars .= \$$varname;
TR }
TR $vars .= ');';
TR eval($vars);
TR
TR $GLOBALS['loaded_classes'][$class_name][$name]['hash'] = $hash;
TR }
TR return
TR $GLOBALS['loaded_classes'][$class_name][$name]['class'];
TR }elseif(!isset($GLOBALS['loaded_classes'][$class_name])){
TR $file = $GLOBALS['class_dir'].$class.'.inc';
TR if(!file_exists($file)){
TR $paths = split(OS_JOIN,ini_get('include_path'));
TR $found = false;
TR while(!$found list($key,$val) = each($paths)){
TR $file = $val.OS_SEP.$class.'.inc';
TR $found = file_exists($file);
TR }
TR }else $found = true;
TR if($found){
TR include($file);
TR classLoader::loadLib();
TR }
TR }
TR if(isset($GLOBALS['loaded_classes'][$class_name])){
TR $vars =
TR '$GLOBALS[\'loaded_classes\'][$class_name][$name][\'class\'] =
TR new '.$class.'(';
TR if($num_args 2) {
TR for ($i = 2; $i $num_args; $i++) {
TR $vars .= ($i 2)? ',':'';
TR $varname = 'variable'.$i;
TR $$varname = $arg_list[$i];
TR $vars .= \$$varname;
TR }
TR }
TR $vars .= ');';
TR eval($vars);
TR $GLOBALS['loaded_classes'][$class_name][$name]['hash'] = $hash;
TR return
TR $GLOBALS['loaded_classes'][$class_name][$name]['class'];
TR }
TR return false;
TR }
TR function remove($class,$name=''){
TR $r = false;
TR $class_name = strtolower($class);
TR $name = (empty($name))? $class:$name;
TR if(isset($GLOBALS['loaded_classes'][$class_name][$name])){
TR unset($GLOBALS['loaded_classes'][$class_name][$name]);
TR $r = true;
TR }
TR return $r;
TR }
TR function find($class,$name){
TR $class_name = strtolower($class);
TR if(isset($GLOBALS['loaded_classes'][$class_name][$name])){
TR return
TR $GLOBALS['loaded_classes'][$class_name][$name]['class'];
TR }else{
TR return false;
TR }
TR }
TR }
TR //Usage
TR // not tested in php5
TR // all class files end in .inc
TR // all library files end in .lib
TR // I don't instanciate the class so uou just
TR // need to set 2 global variables them call loadLib()
Re: [PHP] Best way to use other objects within classes?
Hi,
Friday, June 3, 2005, 5:16:19 AM, you wrote:
MP Hi All,
MP I'm using the MDB2 object to access my MySQL database. I have a number
MP of classes that perform page-building activities that need db access,
MP and I'm wondering what the best way to expose the MDB2 object to them is?
MP (Note: my development environment is PHP 5.0.3, but the production
MP environment is 4.3.10. This is my first project built with 5.x local and
MP 4.1.x remote, so if anyone with more experience spots any fatal flaws
MP where I'm using 5.x specific methods etc, I'd appreciate knowing about them)
MP Currently, I'm instantiating the MDB2 class in my main page, then
MP passing it as an object reference to each of the other classes that
MP require it.
MP A simple representation of my main page and a class would be:
MP ?
MP $db = connectMDB2(); // function that returns instantiated MDB2 object
MP $comments = new displayComments(); // class that performs displaying
MP of comments
MP $comments-set_db($db); // passing the MDB2 object to the class
MP $comments-doSomethingElse();
?
MP The displayComments() class might then look something like:
MP class displayComments{
MP private $db;
MP public function set_db($db){
$this-db = $db;
MP }
MP public function doSomethingElse(){
MP $sql = SELECT something FROM sometable;
$rs = $this-db-query($sql);
MP while ($row = $rs-fetchRow(MDB2_FETCHMODE_OBJECT)){
echo $row-something.br /;
MP }
$rs-free();
MP }
MP }
MP My main page calls on at least 8 or 9 such classes as it is being built,
MP and I'm concerned that I may not be handling the MDB2 object in respect
MP to them in the most efficient way possible. In a way, I guess this isn't
MP specifically about the MDB2 package, but more about how to handle
MP objects when they are required within classes.
MP I'd very much appreciate any comments or advice anyone might be able to
MP give.
MP Much warmth,
MP Murray
My solution to this problem was to write a class loader and to call it
whenever I needed a particular class. I give each instance a name and
the loader checks if an instance of that class, that name exists. If
it does it returns a reference directly, if not it loads the class
and then returns the reference. This way I don't have to worry about
passing references around. It is a little more complex than that as I
also check if the class was passed the same variables, if not it calls
the constructor again. Let me know if you want to try the code (only
tested on php4)
--
regards,
Tom
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Best way to use other objects within classes?
Hi All,
I'm using the MDB2 object to access my MySQL database. I have a number
of classes that perform page-building activities that need db access,
and I'm wondering what the best way to expose the MDB2 object to them is?
(Note: my development environment is PHP 5.0.3, but the production
environment is 4.3.10. This is my first project built with 5.x local and
4.1.x remote, so if anyone with more experience spots any fatal flaws
where I'm using 5.x specific methods etc, I'd appreciate knowing about them)
Currently, I'm instantiating the MDB2 class in my main page, then
passing it as an object reference to each of the other classes that
require it.
A simple representation of my main page and a class would be:
?
$db = connectMDB2(); // function that returns instantiated MDB2 object
$comments = new displayComments(); // class that performs displaying
of comments
$comments-set_db($db); // passing the MDB2 object to the class
$comments-doSomethingElse();
?
The displayComments() class might then look something like:
class displayComments{
private $db;
public function set_db($db){
$this-db = $db;
}
public function doSomethingElse(){
$sql = SELECT something FROM sometable;
$rs = $this-db-query($sql);
while ($row = $rs-fetchRow(MDB2_FETCHMODE_OBJECT)){
echo $row-something.br /;
}
$rs-free();
}
}
My main page calls on at least 8 or 9 such classes as it is being built,
and I'm concerned that I may not be handling the MDB2 object in respect
to them in the most efficient way possible. In a way, I guess this isn't
specifically about the MDB2 package, but more about how to handle
objects when they are required within classes.
I'd very much appreciate any comments or advice anyone might be able to
give.
Much warmth,
Murray
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Best way to use other objects within classes?
On 6/2/05, Murray @ PlanetThoughtful [EMAIL PROTECTED] wrote: private $db; PHP4 doesn't have member visibility. -- Greg Donald Zend Certified Engineer http://destiney.com/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Best way to use other objects within classes?
Greg Donald wrote: On 6/2/05, Murray @ PlanetThoughtful [EMAIL PROTECTED] wrote: private $db; PHP4 doesn't have member visibility. Hi Greg, Thanks for this tip! Regards, Murray -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
