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https://iqfuyunw.wordpress.com/2019/11/16/php%e7%94%a8substr%e5%87%bd%e6%95%b0%e6%88%aa%e5%8f%96%e5%ad%97%e7%ac%a6%e4%b8%b2%e4%b8%ad%e7%9a%84%e6%9f%90%e9%83%a8%e5%88%86/
PHP用substr函数截取字符串中的某部分