Three categories summarize five PHP design patterns

Factory Model
Single element mode
Observer Mode
Command Chain Mode
Rule Mode
Copy codeThe Code is as follows:
Class people {
Private $ name = '';
Private $ user = null;
Private function _ constract ($ name) {/* Here private defines the mode to assist in implementing a single element */
$ This-> name = $ name;
}
Public static function instance ($ name) {/* This method implements the factory mode */
Static $ object = null;/* this variable implements the single-element mode */
If (is_null ($ object ))
$ Object = new people ($ name );
Return $ object;
}
Public function work_in ($ who = null)
{
If (is_null ($ who) echo 'error ';
Else {
$ This-> user [] = $ who;/* this array variable implements the observer mode */
Echo $ who-> work ();/* Implementation Policy mode of this method call */
}
}
Public function on_action ($ which = ''){
If (empty ($ which) echo 'error ';
Else {
Foreach ($ this-> user as $ user)
$ User-> action ($ which);/* call this method to implement the command chain mode */
}
}
}
$ People = people: instance ('jack ');
$ People-> work_in (new student );
$ People-> work_in (new teacher );
$ People-> on_action ('eat ');
Class student {
Function work (){
Echo '<br/> I am a student, 9 to 5. ';
}
Function action ($ which ){
If (method_exists ($ this, $ which) return $ this-> $ which ();
Else echo 'you are wrong! ';
}
Function eat (){
Echo '<br/> I am a student and can only use a package. ';
}
}
Class teacher {
Function work (){
Echo '<br/> I am a teacher and have the busiest time preparing lessons at night. ';
}
Function action ($ which ){
If (method_exists ($ this, $ which) return $ this-> $ which ();
Else echo 'I can not do it! ';
}
Function eat (){
Echo '<br/> I am a teacher and can have a big meal every day. ';
}
}