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<?php
$str = "Shanghai";
echo chunk_split($str,1,".");
?>

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chunk_split(string,length,end)
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end ¿ÉÑ¡¡£×Ö·û´®Öµ£¬¶¨ÒåÔÚÿ¸ö×Ö·û´®¿éÄ©¶Ë·ÅÖõÄÄÚÈÝ¡£Ä¬ÈÏÊÇ \r\n¡£

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<?php
$str = "Hello world!";
echo chunk_split($str,6,"...");
?>

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