var_dump(‘ 123fg456‘==123);var_dump(‘some string‘ == 0);var_dump(123.0 == ‘123d456‘);var_dump(0 == "a");var_dump("1" == "01");var_dump("1" == "1e0");https://www.jb51.net/article/38015.htm
php中慎用==
原文：https://www.cnblogs.com/maidongdong/p/10370321.html
