‘‘ == 0 == false
‘123‘ == 123
‘abc‘ == 0
‘123a‘ == 123
‘0x01‘ == 1
‘0e123456789‘ == ‘0e987654321‘
[false] == [0] == [NULL] == [‘‘]
NULL == false == 0
true == 1
PHP弱类型总结
原文：https://www.cnblogs.com/iAmSoScArEd/p/11460787.html
