php中实现事件模式

https://yq.aliyun.com/ziliao/162660

<?php

class Event{

    private $events = [];

    public function listen($name, $callback){

        if(!key_exists($name, $this->events))

            $this->events[$name] = $callback;

    }

    public function trigger($name){

        if(key_exists($name, $this->events)){

            call_user_func($name);

        }

    }

}

$eventManager = new Event();

function go(){

    echo "go event happen!";

}

$eventManager->listen('go', 'go');

//$eventManager->trigger('go');

var_dump(get_defined_functions());

　　

------------------------------------------------------

D:\wnmp\www\vidagrid_iot\app\webroot\event.php:27:

array (size=2)

  'internal' =>

    array (size=1355)

      0 =>

string

 'zend_version' (length=12)

      1 =>

string

 'func_num_args' (length=13)

      2 =>

string

 'func_get_arg' (length=12)

      3 =>

string

 'func_get_args' (length=13)

      4 =>

string

 'strlen' (length=6)

      5 =>

string

 'strcmp' (length=6)

      6 =>

string

 'strncmp' (length=7)

      7 =>

string

 'strcasecmp' (length=10)

      8 =>

string

 'strncasecmp' (length=11)

      9 =>

string

 'each' (length=4)

      10 =>

string

 'error_reporting' (length=15)

      11 =>

string

 'define' (length=6)

      12 =>

string

 'defined' (length=7)

      13 =>

string

 'get_class' (length=9)

      14 =>

string

 'get_called_class' (length=16)

      15 =>

string

 'get_parent_class' (length=16)

      16 =>

string

 'method_exists' (length=13)

      17 =>

string

 'property_exists' (length=15)

      18 =>

string

 'class_exists' (length=12)

      19 =>

string

 'interface_exists' (length=16)

      20 =>

string

 'trait_exists' (length=12)

      21 =>

string

 'function_exists' (length=15)

      22 =>

string

 'class_alias' (length=11)

      23 =>

string

 'get_included_files' (length=18)

      24 =>

string

 'get_required_files' (length=18)

      25 =>

string

 'is_subclass_of' (length=14)

      26 =>

string

 'is_a' (length=4)

      27 =>

string

 'get_class_vars' (length=14)

      28 =>

string

 'get_object_vars' (length=15)

      29 =>

string

 'get_class_methods' (length=17)

      30 =>

string

 'trigger_error' (length=13)

      31 =>

string

 'user_error' (length=10)

      32 =>

string

 'set_error_handler' (length=17)

      33 =>

string

 'restore_error_handler' (length=21)

      34 =>

string

 'set_exception_handler' (length=21)

      35 =>

string

 'restore_exception_handler' (length=25)

      36 =>

string

 'get_declared_classes' (length=20)

      37 =>

string

 'get_declared_traits' (length=19)

      38 =>

string

 'get_declared_interfaces' (length=23)

      39 =>

string

 'get_defined_functions' (length=21)

      40 =>

string

 'get_defined_vars' (length=16)

      41 =>

string

 'create_function' (length=15)

      42 =>

string

 'get_resource_type' (length=17)

      43 =>

string

 'get_loaded_extensions' (length=21)

      44 =>

string

 'extension_loaded' (length=16)

      45 =>

string

 'get_extension_funcs' (length=19)

      46 =>

string

 'get_defined_constants' (length=21)

      47 =>

string

 'debug_backtrace' (length=15)

      48 =>

string

 'debug_print_backtrace' (length=21)

      49 =>

string

 'gc_collect_cycles' (length=17)

      50 =>

string

 'gc_enabled' (length=10)

      51 =>

string

 'gc_enable' (length=9)

      52 =>

string

 'gc_disable' (length=10)

      53 =>

string

 'bcadd' (length=5)

      54 =>

string

 'bcsub' (length=5)

      55 =>

string

 'bcmul' (length=5)

      56 =>

string

 'bcdiv' (length=5)

      57 =>

string

 'bcmod' (length=5)

      58 =>

string

 'bcpow' (length=5)

      59 =>

string

 'bcsqrt' (length=6)

      60 =>

string

 'bcscale' (length=7)

      61 =>

string

 'bccomp' (length=6)

      62 =>

string

 'bcpowmod' (length=8)

      63 =>

string

 'jdtogregorian' (length=13)

      64 =>

string

 'gregoriantojd' (length=13)

      65 =>

string

 'jdtojulian' (length=10)

      66 =>

string

 'juliantojd' (length=10)

      67 =>

string

 'jdtojewish' (length=10)

      68 =>

string

 'jewishtojd' (length=10)

      69 =>

string

 'jdtofrench' (length=10)

      70 =>

string

 'frenchtojd' (length=10)

      71 =>

string

 'jddayofweek' (length=11)

      72 =>

string

 'jdmonthname' (length=11)

      73 =>

string

 'easter_date' (length=11)

      74 =>

string

 'easter_days' (length=11)

      75 =>

string

 'unixtojd' (length=8)

      76 =>

string

 'jdtounix' (length=8)

      77 =>

string

 'cal_to_jd' (length=9)

      78 =>

string

 'cal_from_jd' (length=11)

      79 =>

string

 'cal_days_in_month' (length=17)

      80 =>

string

 'cal_info' (length=8)

      81 =>

string

 'ctype_alnum' (length=11)

      82 =>

string

 'ctype_alpha' (length=11)

      83 =>

string

 'ctype_cntrl' (length=11)

      84 =>

string

 'ctype_digit' (length=11)

      85 =>

string

 'ctype_lower' (length=11)

      86 =>

string

 'ctype_graph' (length=11)

      87 =>

string

 'ctype_print' (length=11)

      88 =>

string

 'ctype_punct' (length=11)

      89 =>

string

 'ctype_space' (length=11)

      90 =>

string

 'ctype_upper' (length=11)

      91 =>

string

 'ctype_xdigit' (length=12)

      92 =>

string

 'strtotime' (length=9)

      93 =>

string

 'date' (length=4)

      94 =>

string

 'idate' (length=5)

      95 =>

string

 'gmdate' (length=6)

      96 =>

string

 'mktime' (length=6)

      97 =>

string

 'gmmktime' (length=8)

      98 =>

string

 'checkdate' (length=9)

      99 =>

string

 'strftime' (length=8)

      100 =>

string

 'gmstrftime' (length=10)

      101 =>

string

 'time' (length=4)

      102 =>

string

 'localtime' (length=9)

      103 =>

string

 'getdate' (length=7)

      104 =>

string

 'date_create' (length=11)

      105 =>

string

 'date_create_immutable' (length=21)

      106 =>

string

 'date_create_from_format' (length=23)

      107 =>

string

 'date_create_immutable_from_format' (length=33)

      108 =>

string

 'date_parse' (length=10)

      109 =>

string

 'date_parse_from_format' (length=22)

      110 =>

string

 'date_get_last_errors' (length=20)

      111 =>

string

 'date_format' (length=11)

      112 =>

string

 'date_modify' (length=11)

      113 =>

string

 'date_add' (length=8)

      114 =>

string

 'date_sub' (length=8)

      115 =>

string

 'date_timezone_get' (length=17)

      116 =>

string

 'date_timezone_set' (length=17)

      117 =>

string

 'date_offset_get' (length=15)

      118 =>

string

 'date_diff' (length=9)

      119 =>

string

 'date_time_set' (length=13)

      120 =>

string

 'date_date_set' (length=13)

      121 =>

string

 'date_isodate_set' (length=16)

      122 =>

string

 'date_timestamp_set' (length=18)

      123 =>

string

 'date_timestamp_get' (length=18)

      124 =>

string

 'timezone_open' (length=13)

      125 =>

string

 'timezone_name_get' (length=17)

      126 =>

string

 'timezone_name_from_abbr' (length=23)

      127 =>

string

 'timezone_offset_get' (length=19)

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