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回复内容：
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$content = include "xxx.svg";
preg_match("/登录后复制
以下是具体的：
$content = '';
preg_match("/登录后复制
输出结果：
string 'M32,0C14.327,0,0,14.327,0,32s14.327,32,32,32s32-14.327,32-32S49.673,0,32,0z M32,58C17.641,58,6,46.359,6,32
C6,17.64,17.641,6,32,6c14.359,0,26,11.64,26,26C58,46.359,46.359,58,32,58z' (length=193)
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