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                **一.substr使用** ``` $s=substr('A云知夢在線平臺', 0, 3); #超出: $s=substr('A云知夢在線平臺', 50, 3); ``` &emsp; **二.mb_substr使用** ``` $s=mb_substr('B云知夢在線平臺', 0, 3); #超出: $s=mb_substr('A云知夢在線平臺', 50, 3); ``` &emsp; **三.iconv_substr使用** ``` $s=iconv_substr('C云知夢在線平臺', 0, 3); #超出: $s=iconv_substr('A云知夢在線平臺', 50, 3); ``` &emsp; **配套的PHP8新特性詳解視頻教程,請查看以下專輯** 鏈接:[https://www.ixigua.com/6937490165329822219](https://www.ixigua.com/6937490165329822219)
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