chunk_split() 函數把字符串分割為一連串更小的部分。chunk_split(string,length,end)

string	必需。規定要分割的字符串。
length	可選。數字值，定義字符串塊的長度。默認是 76。
end	可選。字符串值，定義在每個字符串塊末端放置的內容。默認是 \r\n。

<?php echo chunk_split("Shanghai",2,".");Sh.an.gh.ai. iVBORw0KGgoAAAANSUhEUgAAAUAAAAFACAIAAABC8jL9AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAG VklEQVR4nO3cQXLjOBAAQWtj//9l72GuGxRHhOEuMvPqCAmkWDIOLby+v7+/gKZ/fnsBwOcEDGEC hjABQ5iAIUzAECZgCBMwhAkYwv49/vPr9dqzjpmWjKltvodv13xyPdte54wnP4fHN9B/YAgTMIQJ GMIEDGEChjABQ5iAIUzAECZgCBMwhAkYwt7MQpMzbWz4zHocjfqxNQHnPoCdT/mqmzOtzDPXNe2H HNNcvz+20BAmYAgTMIQJGMIEDGEChjABQ5iAIUzAECZgCNs0C/3kkbppI5BPdr/n0I8Z7mbVgewk 2EJDmIAhTMAQJmAIEzCECRjCBAxhAoYwAUOYgCHMKOUlxhL5XQLewXwyP8QWGsIEDGEChjABQ5iA IUzAECZgCBMwhAkYwgQMYUYp72bbVKbxzwkEXLJqpnrUwfdcYQsNYQKGMAFDmIAhTMAQJmAIEzCE CRjCBAxhAoYwo5Q7TBsbnrYePrYp4LsO3565rp21bF5P7mPNLfgtW2gIEzCECRjCBAxhAoYwAUOY gCFMwBAmYAgTMIStGaV87GzttAuPrmfVhOO0y9/Ajxl2WHWe8yrT1sPHbKEhTMAQJmAIEzCECRjC BAxhAoYwAUOYgCFMwBBmlHKHu04m3vW6Ql73Oyl3mp0D/QPf6wwP4cdsoSFMwBAmYAgTMIQJGMIE DGEChjABQ5iAIUzAEPZmFro4LjftiNaTziy7+F6jFJ/nY/4DQ5iAIUzAECZgCBMwhAkYwgQMYQKG MAFDmIAhTMAQtu9c6CXztwMPIh64pJzis7FtzccvsibgaTf3jJ1r3vZeOyfsz7zXwM/9ZmyhIUzA ECZgCBMwhAkYwgQMYQKGMAFDmIAhTMAQ9joeiDMKx4HiCO1OmVnonZaM+558sG45L71TdF46NLtu Cw1hAoYwAUOYgCFMwBAmYAgTMIQJGMIEDGEChrDeKOWS83gHGjhR+FZxzWeEruvNjxlOvcS8q80F PHCmetps9rTrGvKM2UJDmIAhTMAQJmAIEzCECRjCBAxhAoYwAUOYgCGsNwu9xM5xuYGjpkXTbuOS mfwR50KvGgptzaD+iiXXvvkGjjrH+35soSFMwBAmYAgTMIQJGMIEDGEChjABQ5iAIUzAEPZmlHLa AOrX3nOhB17+seKRsQvfK/d5XTfrxwzbHqwzhT/wafhbO2ePR33pfI2Zu7aFhjABQ5iAIUzAECZg CBMwhAkYwgQMYQKGMAFD2KxRym0ePia56vKfPJc+ZD1rAh41w7zQqusadX+GPHk/Ifd5XWcLDWEC hjABQ5iAIUzAECZgCBMwhAkYwgQMYQKGsFmz0NGJyznmjPilhW7jrIC3WVX4tNe5Mbfof9lCQ5iA IUzAECZgCBMwhAkYwgQMYQKGMAFDmIAh7KGjlAOHXe86KrjzDOoHmhVw6DzeNPf5uiVfuNfvsy00 hAkYwgQMYQKGMAFDmIAhTMAQJmAIEzCECRjCBAxhb2ahp517PO11ps0Mb/5FxKqZ6m3LnvZ5Xec/ MIQJGMIEDGEChjABQ5iAIUzAECZgCBMwhAkYwt6MUt5v9Oyv7JxMPHOrH3sc7LSRzDlmnQsNE4S+ CGyhIUzAECZgCBMwhAkYwgQMYQKGMAFDmIAhTMAQZpSy5K6jznxsTcCh2dE/BpaQO2N5p1te1NeK 67KFhjABQ5iAIUzAECZgCBMwhAkYwgQMYQKGMAFD2KZZ6M2ji8XJu4HTnccWLnjatS85o3sPP2a4 5MynOO3p5E5soSFMwBAmYAgTMIQJGMIEDGEChjABQ5iAIUzAEGaU8m5Mbu6x7T4fj+sKuGTV2dGr LBnot+YrbKEhTMAQJmAIEzCECRjCBAxhAoYwAUOYgCFMwBBmlJJnCZ35fIaAf9zOp+HG51RPmwM/ Y8OabaEhTMAQJmAIEzCECRjCBAxhAoYwAUOYgCFMwBBmlPKSheN7Nzvu9I+F65l2aWdsWPOmgEPT 4fwxaoT7ZAm3nJc+ZgsNYQKGMAFDmIAhTMAQJmAIEzCECRjCBAxhAoaw1/Ek18DRs52Ko3mr3HI2 u+j4g/Bjhh0e+0Ww8JzqafdwyBecLTSECRjCBAxhAoYwAUOYgCFMwBAmYAgTMIQJGMLezEIDk/kP DGEChjABQ5iAIUzAECZgCBMwhAkYwgQMYf8BoRGd+xvMhVQAAAAASUVORK5CYII=

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總結

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