{"action":"created","issue":{"url":"https://api.github.com/repos/woothemes/woocommerce/issues/9064","labels_url":"https://api.github.com/repos/woothemes/woocommerce/issues/9064/labels{/name}","comments_url":"https://api.github.com/repos/woothemes/woocommerce/issues/9064/comments","events_url":"https://api.github.com/repos/woothemes/woocommerce/issues/9064/events","html_url":"https://github.com/woothemes/woocommerce/pull/9064","id":105119240,"number":9064,"title":"Replace array_intersect with own function wc_array_intersect() for better performance","user":{"login":"Ninos","id":1012403,"avatar_url":"https://avatars.githubusercontent.com/u/1012403?v=3","gravatar_id":"","url":"https://api.github.com/users/Ninos","html_url":"https://github.com/Ninos","followers_url":"https://api.github.com/users/Ninos/followers","following_url":"https://api.github.com/users/Ninos/following{/other_user}","gists_url":"https://api.github.com/users/Ninos/gists{/gist_id}","starred_url":"https://api.github.com/users/Ninos/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Ninos/subscriptions","organizations_url":"https://api.github.com/users/Ninos/orgs","repos_url":"https://api.github.com/users/Ninos/repos","events_url":"https://api.github.com/users/Ninos/events{/privacy}","received_events_url":"https://api.github.com/users/Ninos/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/woothemes/woocommerce/labels/Needs%20Dev%20Feedback","name":"Needs Dev Feedback","color":"a46497"}],"state":"closed","locked":false,"assignee":{"login":"georgestephanis","id":941023,"avatar_url":"https://avatars.githubusercontent.com/u/941023?v=3","gravatar_id":"","url":"https://api.github.com/users/georgestephanis","html_url":"https://github.com/georgestephanis","followers_url":"https://api.github.com/users/georgestephanis/followers","following_url":"https://api.github.com/users/georgestephanis/following{/other_user}","gists_url":"https://api.github.com/users/georgestephanis/gists{/gist_id}","starred_url":"https://api.github.com/users/georgestephanis/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/georgestephanis/subscriptions","organizations_url":"https://api.github.com/users/georgestephanis/orgs","repos_url":"https://api.github.com/users/georgestephanis/repos","events_url":"https://api.github.com/users/georgestephanis/events{/privacy}","received_events_url":"https://api.github.com/users/georgestephanis/received_events","type":"User","site_admin":false},"milestone":null,"comments":4,"created_at":"2015-09-06T21:57:38Z","updated_at":"2015-10-01T17:21:08Z","closed_at":"2015-10-01T15:55:10Z","pull_request":{"url":"https://api.github.com/repos/woothemes/woocommerce/pulls/9064","html_url":"https://github.com/woothemes/woocommerce/pull/9064","diff_url":"https://github.com/woothemes/woocommerce/pull/9064.diff","patch_url":"https://github.com/woothemes/woocommerce/pull/9064.patch"},"body":"The difference are only the changed value types (string to integer). But we could also use variant *array_fill_keys -> foreach -> isset -> array add -> sizeof*. The only problem is, if array1 has more values than just 2, the performance will may be more bad as the variant *array_fill_keys -> array_intersect_key -> array_keys -> sizeof*.\r\n\r\n**Edit:** I've tested *array_fill_keys -> foreach -> isset -> array add -> sizeof* with ~ 6.000 values for `$array1` and the performance was still better with *array_fill_keys -> array_intersect_key -> array_keys -> sizeof*. Just *array_fill_keys -> array_intersect_key -> sizeof* was then a little bit faster than *array_fill_keys -> array_intersect_key -> array_keys -> sizeof*. Because of that I'll optimize the function `wc_array_intersect()` in next commit.\r\n\r\nSee also #9041\r\n\r\n# Benchmark\r\n\r\nHere's a little benchmark:\r\n## Code\r\n```php\r\n$array1 = explode( ',', '47,103' );\r\n$array2 = explode( ',', 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8935,68969,68944,68952,68960,68966,68907,68938,68910,68942,68912,68915,68946,68889,68918,68950,68890,68920,68892,68925,68954,68897,68926,68958,68898,68929,68901,68933,68963,68905,68804,68812,68820,68830,68795,68834,68791,68838,68796,68841,68800,68845,68806,68848,68809,68851,68814,68854,68818,68857,68822,68860,68826,68863,68831,68766,68776,68750,68786,68757,68759,68762,68727,68732,68767,68707,68736,68770,68711,68740,68775,68744,68715,68749,68780,68719,68782,68753,68724,68788,68730,68739,68712,68688,68721,68643,68653,68661,68671,68681,68680,68698,68638,68684,68700,68642,68689,68705,68647,68650,68655,68658,68663,68667,68630,68672,68691,68634,68675,68694,68635,68596,68607,68615,68625,68575,68614,68550,68579,68618,68551,68581,68621,68553,68584,68626,68557,68587,68559,68589,68562,68592,68565,68597,68569,68601,68570,68605,68573,68609,68536,68508,68511,68484,68513,68487,68515,68490,68517,68493,68520,68496,68524,68498,68527,68502,68530,68504,68533,68506,68445,68453,68463,68437,68471,68478,68447,68481,68419,68452,68423,68426,68457,68459,68431,68402,68435,68465,68405,68439,68470,68410,68442,68474,68414,68418,68391,68428,68399,68408,68354,68364,68372,68382,68345,68359,68316,68363,68321,68367,68326,68373,68331,68377,68336,68381,68339,68385,68344,68389,68348,68393,68351,68398,68356,68305,68311,68319,68327,68335,68297,68259,68269,68279,68289,68266,68295,68233,68271,68300,68239,68304,68244,68275,68308,68249,68280,68283,68313,68253,68286,68258,68263,68291,68229,68237,68245,68251,68224,68228,68200,68204,68208,68213,68218,881,821,186,394,389,369,324,655,654,653,652,651,99,96,93,90,87,83,79,76,73,70,67,60,56,53,50,47,40,106,105,104,103,102,15' );\r\n\r\n// ---------------------------\r\n\r\necho \"---------------------------\\n\";\r\necho \"array_intersect -> sizeof\\n\";\r\necho \"---------------------------\\n\";\r\n$time_start = microtime(true);\r\n\r\nvar_dump( sizeof( array_intersect( $array1, $array2 ) ) > 0 );\r\n\r\n$time_end = microtime(true);\r\n\r\nvar_dump( array_intersect( $array1, $array2 ) );\r\n\r\necho \"\\n\" . $time_end - $time_start . \"\\n\\n\";\r\n\r\n// ---------------------------\r\n\r\necho \"---------------------------\\n\";\r\necho \"array_fill_keys -> array_intersect_key -> sizeof\\n\";\r\necho \"---------------------------\\n\";\r\n$time_start = microtime(true);\r\n\r\nvar_dump( sizeof( array_intersect_key( array_fill_keys( $array1, true), array_fill_keys( $array2, true ) ) ) > 0 );\r\n\r\n$time_end = microtime(true);\r\n\r\nvar_dump( array_intersect_key( array_fill_keys( $array1, true), array_fill_keys( $array2, true ) ) );\r\n\r\necho \"\\n\" . $time_end - $time_start . \"\\n\\n\";\r\n\r\n// ---------------------------\r\n\r\necho \"---------------------------\\n\";\r\necho \"array_fill_keys -> array_intersect_key -> array_keys -> sizeof\\n\";\r\necho \"---------------------------\\n\";\r\n$time_start = microtime(true);\r\n\r\nvar_dump( sizeof( array_keys( array_intersect_key( array_fill_keys( $array1, true), array_fill_keys( $array2, true ) ) ) ) > 0 );\r\n\r\n$time_end = microtime(true);\r\n\r\nvar_dump( array_keys( array_intersect_key( array_fill_keys( $array1, true), array_fill_keys( $array2, true ) ) ) );\r\n\r\necho \"\\n\" . $time_end - $time_start . \"\\n\\n\";\r\n\r\n// ---------------------------\r\n\r\necho \"---------------------------\\n\";\r\necho \"foreach -> in_array -> array add -> sizeof\\n\";\r\necho \"---------------------------\\n\";\r\n$time_start = microtime(true);\r\n\r\n$array_intersect1 = array();\r\nforeach( $array1 as $key => $value ) {\r\n    if( in_array( $value, $array2 ) ) {\r\n        $array_intersect1[$key] = $value;\r\n    }\r\n}\r\n\r\nvar_dump( sizeof( $array_intersect1 ) > 0 );\r\n\r\n$time_end = microtime(true);\r\n\r\nvar_dump( $array_intersect1 );\r\n\r\necho \"\\n\" . $time_end - $time_start . \"\\n\\n\";\r\n\r\n// ---------------------------\r\n\r\necho \"---------------------------\\n\";\r\necho \"array_fill_keys -> foreach -> isset -> array add -> sizeof\\n\";\r\necho \"---------------------------\\n\";\r\n$time_start = microtime(true);\r\n\r\n$array_intersect2 = array();\r\n$array2_new = array_fill_keys( $array2, true);\r\nforeach( $array1 as $key => $value ) {\r\n    if( isset( $array2_new[$value] ) ) {\r\n        $array_intersect2[$key] = $value;\r\n    }\r\n}\r\n\r\nvar_dump( sizeof( $array_intersect2 ) > 0 );\r\n\r\n$time_end = microtime(true);\r\n\r\nvar_dump( $array_intersect2 );\r\n\r\necho \"\\n\" . $time_end - $time_start;\r\n```\r\n\r\n## php5.2 benchmark:\r\n```\r\n---------------------------\r\narray_intersect -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.004478931427002\r\n\r\n---------------------------\r\narray_fill_keys -> array_intersect_key -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [47]=>\r\n  bool(true)\r\n  [103]=>\r\n  bool(true)\r\n}\r\n0.0010700225830078\r\n\r\n---------------------------\r\narray_fill_keys -> array_intersect_key -> array_keys -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  int(47)\r\n  [1]=>\r\n  int(103)\r\n}\r\n0.00098419189453125\r\n\r\n---------------------------\r\nforeach -> in_array -> array add -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.0013899803161621\r\n\r\n---------------------------\r\narray_fill_keys -> foreach -> isset -> array add -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.00060606002807617\r\n```\r\n\r\n## php5.3 benchmark:\r\n```\r\n---------------------------\r\narray_intersect -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.0048990249633789\r\n\r\n---------------------------\r\narray_fill_keys -> array_intersect_key -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [47]=>\r\n  bool(true)\r\n  [103]=>\r\n  bool(true)\r\n}\r\n0.00092482566833496\r\n\r\n---------------------------\r\narray_fill_keys -> array_intersect_key -> array_keys -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  int(47)\r\n  [1]=>\r\n  int(103)\r\n}\r\n0.00060796737670898\r\n\r\n---------------------------\r\nforeach -> in_array -> array add -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.0012710094451904\r\n\r\n---------------------------\r\narray_fill_keys -> foreach -> isset -> array add -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.00042319297790527\r\n```\r\n\r\n## php5.4 benchmark:\r\n```\r\n---------------------------\r\narray_intersect -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.0052270889282227\r\n\r\n---------------------------\r\narray_fill_keys -> array_intersect_key -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [47]=>\r\n  bool(true)\r\n  [103]=>\r\n  bool(true)\r\n}\r\n0.00096297264099121\r\n\r\n---------------------------\r\narray_fill_keys -> array_intersect_key -> array_keys -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  int(47)\r\n  [1]=>\r\n  int(103)\r\n}\r\n0.0007319450378418\r\n\r\n---------------------------\r\nforeach -> in_array -> array add -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.001317024230957\r\n\r\n---------------------------\r\narray_fill_keys -> foreach -> isset -> array add -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.00048303604125977\r\n```\r\n\r\n## php5.5 benchmark:\r\n```\r\n---------------------------\r\narray_intersect -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.0047149658203125\r\n\r\n---------------------------\r\narray_fill_keys -> array_intersect_key -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [47]=>\r\n  bool(true)\r\n  [103]=>\r\n  bool(true)\r\n}\r\n0.00081920623779297\r\n\r\n---------------------------\r\narray_fill_keys -> array_intersect_key -> array_keys -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  int(47)\r\n  [1]=>\r\n  int(103)\r\n}\r\n0.00069499015808105\r\n\r\n---------------------------\r\nforeach -> in_array -> array add -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.0012929439544678\r\n\r\n---------------------------\r\narray_fill_keys -> foreach -> isset -> array add -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.00056004524230957\r\n```\r\n\r\n## php5.6 benchmark:\r\n```\r\n---------------------------\r\narray_intersect -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.0047159194946289\r\n\r\n---------------------------\r\narray_fill_keys -> array_intersect_key -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [47]=>\r\n  bool(true)\r\n  [103]=>\r\n  bool(true)\r\n}\r\n0.00086712837219238\r\n\r\n---------------------------\r\narray_fill_keys -> array_intersect_key -> array_keys -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  int(47)\r\n  [1]=>\r\n  int(103)\r\n}\r\n0.00063204765319824\r\n\r\n---------------------------\r\nforeach -> in_array -> add -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.0014259815216064\r\n\r\n---------------------------\r\narray_fill_keys -> foreach -> isset -> array add -> sizeof\r\n---------------------------\r\nbool(true)\r\narray(2) {\r\n  [0]=>\r\n  string(2) \"47\"\r\n  [1]=>\r\n  string(3) \"103\"\r\n}\r\n0.00040912628173828\r\n```"},"comment":{"url":"https://api.github.com/repos/woothemes/woocommerce/issues/comments/144792213","html_url":"https://github.com/woothemes/woocommerce/pull/9064#issuecomment-144792213","issue_url":"https://api.github.com/repos/woothemes/woocommerce/issues/9064","id":144792213,"user":{"login":"Ninos","id":1012403,"avatar_url":"https://avatars.githubusercontent.com/u/1012403?v=3","gravatar_id":"","url":"https://api.github.com/users/Ninos","html_url":"https://github.com/Ninos","followers_url":"https://api.github.com/users/Ninos/followers","following_url":"https://api.github.com/users/Ninos/following{/other_user}","gists_url":"https://api.github.com/users/Ninos/gists{/gist_id}","starred_url":"https://api.github.com/users/Ninos/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Ninos/subscriptions","organizations_url":"https://api.github.com/users/Ninos/orgs","repos_url":"https://api.github.com/users/Ninos/repos","events_url":"https://api.github.com/users/Ninos/events{/privacy}","received_events_url":"https://api.github.com/users/Ninos/received_events","type":"User","site_admin":false},"created_at":"2015-10-01T17:21:08Z","updated_at":"2015-10-01T17:21:08Z","body":"@mikejolley would be nice to let me know why you closed this PR, so next time I'll do my contributions in better way :-)"}}