After following, you can keep track of his dynamic information in a timely manner
Courses in the relevant section：Pattern modifiers in php regular expressions
如果要匹配的字符串中没有“\n”字符或者模式中没有 ^ 或 $，则设定此 m 修正符没有任何效果。
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Courses in the relevant section：PHP flow control goto syntax
goto：循环执行完成后，最后仍然会执行目标语句。
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