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rtrim();//È¥µô×Ö·û´®ÓÒ¿Õ¸ñ;
trim(); //È¥µô×Ö·û´®Á½±ß¿Õ¸ñ;
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     string separator://ÊDZ»°´ÕÕ·ÖµÄ×Ö·û´®;
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substr(string string, int start [ ,int length]);//È¡²¿·Ö×Ö·û´®;
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strchr()//strstr()µÄ±ðÃûº¯Êý,Ó÷¨Ò»Ñù;
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