{"id":1627,"date":"2015-06-11T16:00:27","date_gmt":"2015-06-11T08:00:27","guid":{"rendered":"http:\/\/www.menglanglang.cn\/?p=1627"},"modified":"2015-06-11T16:00:27","modified_gmt":"2015-06-11T08:00:27","slug":"php%e4%b8%ad%e7%9a%84%e8%bf%ad%e4%bb%a3%e5%99%a8%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"http:\/\/www.menglanglang.cn\/?p=1627","title":{"rendered":"PHP\u4e2d\u7684\u8fed\u4ee3\u5668\u7528\u6cd5"},"content":{"rendered":"

\u5982\u679c\u60f3\u5728\u81ea\u5b9a\u4e49\u7c7b\u4e2d\u91cd\u8f7d\u8fed\u4ee3\u5668\uff0c\u5c31\u9700\u8981\u6267\u884c\u4e00\u4e9b PHP \u9884\u5b9a\u4e49\u7684\u63a5\u53e3\u3002<\/span><\/p>\n

\"PHP\u4e2d\u7684\u8fed\u4ee3\u5668\u7528\u6cd5\"<\/p>\n

\u4efb\u4f55\u5b9e\u73b0 Traversable \u63a5\u53e3\u7684\u7c7b\u90fd\u53ef\u4ee5\u7528 foreach \u7ed3\u6784\u904d\u5386\u3002\u4f46 Traversable \u662f\u4e00\u4e2a\u7a7a\u7684\u63a5\u53e3\u800c\u4e14\u4e0d\u80fd\u88ab\u76f4\u63a5\u6267\u884c\u3002\u53ef\u4ee5\u6267\u884c Iterator \u6216\u8005 IteratorAggregate\uff0c\u5b83\u4eec\u90fd\u662f\u4ece Traversable \u7ee7\u627f\u800c\u6765\u7684\u3002<\/span><\/p>\n

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\n
Code<\/strong>\u00a0\u00a0\u00a0View<\/a>Print<\/a><\/div>\n<\/div>\n
    \n
  1. <?php\u00a0\u00a0<\/span><\/span><\/li>\n
  2. \u00a0\u00a0<\/span><\/li>\n
  3. class<\/span>\u00a0NumberSquared\u00a0<\/span>implements<\/span>\u00a0Iterator\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  4. \u00a0\u00a0\u00a0\u00a0private<\/span>\u00a0<\/span>$start<\/span>,\u00a0<\/span>$end<\/span>,\u00a0<\/span>$cur<\/span>;\u00a0\u00a0<\/span><\/span><\/li>\n
  5. \u00a0\u00a0<\/span><\/li>\n
  6. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0__construct(<\/span>$start<\/span>,\u00a0<\/span>$end<\/span>)\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  7. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this<\/span>->start\u00a0=\u00a0<\/span>$start<\/span>;\u00a0\u00a0<\/span><\/span><\/li>\n
  8. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this<\/span>-><\/span>end<\/span>\u00a0=\u00a0<\/span>$end<\/span>;\u00a0\u00a0<\/span><\/span><\/li>\n
  9. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
  10. \u00a0\u00a0<\/span><\/li>\n
  11. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0<\/span>rewind<\/span>()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  12. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this<\/span>->cur\u00a0=\u00a0<\/span>$this<\/span>->start;\u00a0\u00a0<\/span><\/span><\/li>\n
  13. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
  14. \u00a0\u00a0<\/span><\/li>\n
  15. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0key()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  16. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0<\/span>$this<\/span>->cur;\u00a0\u00a0<\/span><\/span><\/li>\n
  17. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
  18. \u00a0\u00a0<\/span><\/li>\n
  19. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0current()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  20. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0pow(<\/span>$this<\/span>->cur,\u00a02);\u00a0\u00a0<\/span><\/span><\/li>\n
  21. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
  22. \u00a0\u00a0<\/span><\/li>\n
  23. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0next()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  24. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this<\/span>->cur++;\u00a0\u00a0<\/span><\/span><\/li>\n
  25. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
  26. \u00a0\u00a0<\/span><\/li>\n
  27. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0valid()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  28. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0<\/span>$this<\/span>->cur\u00a0<=\u00a0<\/span>$this<\/span>-><\/span>end<\/span>;\u00a0\u00a0<\/span><\/span><\/li>\n
  29. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
  30. }\u00a0\u00a0<\/span><\/li>\n
  31. \u00a0\u00a0<\/span><\/li>\n
  32. $obj<\/span>\u00a0=\u00a0<\/span>new<\/span>\u00a0NumberSquared(4,\u00a09);\u00a0\u00a0<\/span><\/span><\/li>\n
  33. \u00a0\u00a0<\/span><\/li>\n
  34. foreach<\/span>\u00a0(<\/span>$obj<\/span>\u00a0<\/span>as<\/span>\u00a0<\/span>$key<\/span>\u00a0=>\u00a0<\/span>$value<\/span>)\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  35. \u00a0\u00a0\u00a0\u00a0print\u00a0“The\u00a0square\u00a0of\u00a0$key\u00a0is\u00a0$value<br\u00a0\/>”<\/span>;\u00a0\u00a0<\/span><\/span><\/li>\n
  36. }\u00a0\u00a0<\/span><\/li>\n
  37. \u00a0\u00a0<\/span><\/li>\n
  38. ?>\u00a0\u00a0<\/span><\/li>\n<\/ol>\n<\/div>\n

     <\/p>\n

    \u53ef\u4ee5\u628a\u7c7b\u7684\u6267\u884c\u548c\u7c7b\u7684\u8fed\u4ee3\u5668\u5206\u79bb\u5f00\u6765\uff0c\u6539\u5199\u4e0a\u9762\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/span><\/p>\n

    \n
    \n
    Code<\/strong>\u00a0\u00a0\u00a0View<\/a>Print<\/a><\/div>\n<\/div>\n
      \n
    1. <?php\u00a0\u00a0<\/span><\/span><\/li>\n
    2. \u00a0\u00a0<\/span><\/li>\n
    3. class<\/span>\u00a0NumberSquared\u00a0<\/span>implements<\/span>\u00a0IteratorAggregate\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    4. \u00a0\u00a0\u00a0\u00a0private<\/span>\u00a0<\/span>$start<\/span>,\u00a0<\/span>$end<\/span>;\u00a0\u00a0<\/span><\/span><\/li>\n
    5. \u00a0\u00a0<\/span><\/li>\n
    6. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0__construct(<\/span>$start<\/span>,\u00a0<\/span>$end<\/span>)\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    7. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this<\/span>->start\u00a0=\u00a0<\/span>$start<\/span>;\u00a0\u00a0<\/span><\/span><\/li>\n
    8. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this<\/span>-><\/span>end<\/span>\u00a0=\u00a0<\/span>$end<\/span>;\u00a0\u00a0<\/span><\/span><\/li>\n
    9. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
    10. \u00a0\u00a0<\/span><\/li>\n
    11. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0getIterator()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    12. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0<\/span>new<\/span>\u00a0NumberSquaredIterator(<\/span>$this<\/span>);\u00a0\u00a0<\/span><\/span><\/li>\n
    13. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
    14. \u00a0\u00a0<\/span><\/li>\n
    15. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0getStart()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    16. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0<\/span>$this<\/span>->start;\u00a0\u00a0<\/span><\/span><\/li>\n
    17. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
    18. \u00a0\u00a0<\/span><\/li>\n
    19. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0getEnd()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    20. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0<\/span>$this<\/span>-><\/span>end<\/span>;\u00a0\u00a0<\/span><\/span><\/li>\n
    21. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
    22. }\u00a0\u00a0<\/span><\/li>\n
    23. \u00a0\u00a0<\/span><\/li>\n
    24. class<\/span>\u00a0NumberSquaredIterator\u00a0<\/span>implements<\/span>\u00a0Iterator\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    25. \u00a0\u00a0\u00a0\u00a0private<\/span>\u00a0<\/span>$obj<\/span>,\u00a0<\/span>$cur<\/span>;\u00a0\u00a0<\/span><\/span><\/li>\n
    26. \u00a0\u00a0<\/span><\/li>\n
    27. \u00a0\u00a0\u00a0\u00a0function<\/span>\u00a0__construct(<\/span>$obj<\/span>)\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    28. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this<\/span>->obj\u00a0=\u00a0<\/span>$obj<\/span>;\u00a0\u00a0<\/span><\/span><\/li>\n
    29. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
    30. \u00a0\u00a0<\/span><\/li>\n
    31. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0<\/span>rewind<\/span>()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    32. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this<\/span>->cur\u00a0=\u00a0<\/span>$this<\/span>->obj->getStart();\u00a0\u00a0<\/span><\/span><\/li>\n
    33. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
    34. \u00a0\u00a0<\/span><\/li>\n
    35. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0key()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    36. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0<\/span>$this<\/span>->cur;\u00a0\u00a0<\/span><\/span><\/li>\n
    37. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
    38. \u00a0\u00a0<\/span><\/li>\n
    39. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0current()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    40. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0pow(<\/span>$this<\/span>->cur,\u00a02);\u00a0\u00a0<\/span><\/span><\/li>\n
    41. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
    42. \u00a0\u00a0<\/span><\/li>\n
    43. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0next()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    44. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this<\/span>->cur++;\u00a0\u00a0<\/span><\/span><\/li>\n
    45. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
    46. \u00a0\u00a0<\/span><\/li>\n
    47. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>function<\/span>\u00a0valid()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    48. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0<\/span>$this<\/span>->cur\u00a0<=\u00a0<\/span>$this<\/span>->obj->getEnd();\u00a0\u00a0<\/span><\/span><\/li>\n
    49. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
    50. }\u00a0\u00a0<\/span><\/li>\n
    51. \u00a0\u00a0<\/span><\/li>\n
    52. $obj<\/span>\u00a0=\u00a0<\/span>new<\/span>\u00a0NumberSquared(4,\u00a09);\u00a0\u00a0<\/span><\/span><\/li>\n
    53. \u00a0\u00a0<\/span><\/li>\n
    54. foreach<\/span>\u00a0(<\/span>$obj<\/span>\u00a0<\/span>as<\/span>\u00a0<\/span>$key<\/span>\u00a0=>\u00a0<\/span>$value<\/span>)\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    55. \u00a0\u00a0\u00a0\u00a0print\u00a0“The\u00a0square\u00a0of\u00a0$key\u00a0is\u00a0$value<br\u00a0\/>”<\/span>;\u00a0\u00a0<\/span><\/span><\/li>\n
    56. }\u00a0\u00a0<\/span><\/li>\n
    57. \u00a0\u00a0<\/span><\/li>\n
    58. ?>\u00a0\u00a0<\/span><\/li>\n<\/ol>\n<\/div>\n

       <\/p>\n

      \u6267\u884c\u7ed3\u679c\u90fd\u662f\u4e00\u6837\u7684\uff0c\u5982\u4e0b\uff1a<\/span><\/strong><\/p>\n

      \n
        \n
      1. The\u00a0square\u00a0of\u00a04\u00a0is\u00a016\u00a0\u00a0<\/span><\/span><\/li>\n
      2. The\u00a0square\u00a0of\u00a05\u00a0is\u00a025\u00a0\u00a0<\/span><\/li>\n
      3. The\u00a0square\u00a0of\u00a06\u00a0is\u00a036\u00a0\u00a0<\/span><\/li>\n
      4. The\u00a0square\u00a0of\u00a07\u00a0is\u00a049\u00a0\u00a0<\/span><\/li>\n
      5. The\u00a0square\u00a0of\u00a08\u00a0is\u00a064\u00a0\u00a0<\/span><\/li>\n
      6. The\u00a0square\u00a0of\u00a09\u00a0is\u00a081\u00a0\u00a0<\/span><\/li>\n<\/ol>\n<\/div>\n

         <\/p>\n

        \u53c2\u8003\u6765\u6e90\uff1a\u300aPHP\u6743\u5a01\u7f16\u7a0b\u300b\u7684\u7b2c4\u7ae0\uff08PHP 5\u9ad8\u7ea7\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u548c\u8bbe\u8ba1\u6a21\u5f0f\uff09\u90e8\u5206<\/p>\n","protected":false},"excerpt":{"rendered":"

        \u5982\u679c\u60f3\u5728\u81ea\u5b9a\u4e49\u7c7b\u4e2d\u91cd\u8f7d\u8fed\u4ee3\u5668\uff0c\u5c31\u9700\u8981\u6267\u884c\u4e00\u4e9b PHP \u9884\u5b9a\u4e49\u7684\u63a5\u53e3\u3002 \u4efb\u4f55\u5b9e\u73b0 Traversable \u63a5\u53e3\u7684\u7c7b\u90fd\u53ef\u4ee5\u7528 foreach \u7ed3\u6784\u904d\u5386\u3002\u4f46 Traversable \u662f\u4e00\u4e2a\u7a7a\u7684\u63a5\u53e3\u800c\u4e14\u4e0d\u80fd\u88ab\u76f4\u63a5\u6267\u884c\u3002\u53ef\u4ee5\u6267\u884c Iterator \u6216 … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ai_generated_summary":"","wpai_meta_description":"","footnotes":""},"categories":[31],"tags":[598,89,355],"class_list":["post-1627","post","type-post","status-publish","format-standard","hentry","category-php","tag-php","tag-89","tag-355"],"_links":{"self":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/posts\/1627","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1627"}],"version-history":[{"count":0,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/posts\/1627\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1627"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}