php拾遗: 类型约束
突然间什么都不想干，感觉就像来大姨夫一样。。但是又不能断了每个工作日都写博客的习惯。。所以今天水一下吧。
PHP用了快2年了，但是这东西竟然第一次看到，突然间，觉得自己有掉回战五渣的行列了。
翻开官方文档《类型约束》里面讲的非常清楚了。
总共就四种：类名，接口，数组，callable (PHP 5.4起)
那些啥 int string 都不行。。
例子什么的 PHP 手册上已经讲的非常详细了，我也懒的写了，反正这东西就一个知识点，看一下就会了。。
其实，好久没写PHP，现在回头读读各大框架，真怀疑自己真的会PHP么、、
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