符串。这允许在构造正则表达式字 符串时使用字符串变量的内容和其他字符串操作。上面的任何正则表达式代码可以在 Regex() 的单 字符串参数中使用。下面是一些例子： julia> using Dates julia> d = Date(1962,7,10) 1962-07-10 julia> regex_d = Regex("Day " * string(day(d))) r"Day 10" 正如你所见，如果要拆解的容器（比如元组或数组）元素数量不匹配就会报错，和直接给多个参数 报错一样。 9.11. 可选参数 75 9.11 可选参数 在很多情况下，函数参数有合理的默认值，因此也许不需要显式地传递。例如，Dates 模块中的 Date(y, [m, d]) 函数对于给定的年（year）y、月（mouth）m、日（data）d 构造了 Date 类型。但是， m 和 d 参数都是可选的，默认值都是 1。这行为可以简述为： and 1 is automatically passed when only one or two of the arguments are specified: julia> using Dates julia> Date(2000, 12, 12) 2000-12-12 julia> Date(2000, 12) 2000-12-01 julia> Date(2000) 2000-01-01

值，那么该模型已经被软删除了。要启用模型的软删除功能，可 以使用模型上的 Illuminate\Database\Eloquent\SoftDeletestrait 并添加 deleted_at 列 到$dates 属性： dates = ['deleted_at']; } 当然，应该添加 deleted_at 列到数据表。Laravel 查询构建器包含一个帮助函数来创建该列： Schema::table('flights' updated_at 列的值为 Carbon 实例，该类继 承自 PHP 原生的 Datetime 类，并提供了各种有用的方法。 你可以自定义哪些字段被自动调整修改，甚至可以通过重写模型中的$dates 属性完全禁止 调整：

Eloquent 日期转化 当调用模型或模型集合的 toArray 方法时，任何添加到 $casts 的属性， 如 date 或 datetime，现在都会被转化为字符串。这使得在 $dates 数组中制定的日期转化 变得简单方便。 全局作用域 我们重写了全局作用域的实现以便于使用，全局作用域不再需要 remove 方法，因此可以在 所有你使用到该方法的地方将其移除。 如果你曾经在 值，那么该模型已经被软删除了。要启用模型的软删除功能， 可以使用模型上的 Illuminate\Database\Eloquent\SoftDeletestrait 并添加 deleted_at 列 到$dates 属性： dates = ['deleted_at']; } 当然，应该添加 deleted_at 列到数据表。Laravel Schema 构建器包含一个帮助函数来创 建该列： Schema::table('flights'

some operating systems correctly track new and removed files, but do not track changes for sizes or dates of the files within the directory. Changes to the size or date stamp of an existing file will not The CacheIgnoreNoLastMod directive provides a way to specify that documents without last-modified dates should be considered for caching, even without a last-modified date. If neither a last-modified date printing dates. The echo Element This command prints one of the include variables defined below. If the variable is unset, the result is determined by the SSIUndefinedEcho directive. Any dates printed

some operating systems correctly track new and removed files, but do not track changes for sizes or dates of the files within the directory. Changes to the size or date stamp of an existing file will not The CacheIgnoreNoLastMod directive provides a way to specify that documents without last-modified dates should be considered for caching, even without a last-modified date. If neither a last-modified date printing dates. The echo Element This command prints one of the include variables defined below. If the variable is unset, the result is determined by the SSIUndefinedEcho directive. Any dates printed

some operating systems correctly track new and removed files, but do not track changes for sizes or dates of the files within the directory. Changes to the size or date stamp of an existing file will not The CacheIgnoreNoLastMod directive provides a way to specify that documents without last-modified dates should be considered for caching, even without a last-modified date. If neither a last-modified date printing dates. The echo Element This command prints one of the include variables defined below. If the variable is unset, the result is determined by the SSIUndefinedEcho directive. Any dates printed

some operating systems correctly track new and removed files, but do not track changes for sizes or dates of the files within the directory. Changes to the size or date stamp of an existing file will not The CacheIgnoreNoLastMod directive provides a way to specify that documents without last-modified dates should be considered for caching, even without a last-modified date. If neither a last-modified date printing dates. The echo Element This command prints one of the include variables defined below. If the variable is unset, the result is determined by the SSIUndefinedEcho directive. Any dates printed

some operating systems correctly track new and removed files, but do not track changes for sizes or dates of the files within the directory. Changes to the size or date stamp of an existing file will not The CacheIgnoreNoLastMod directive provides a way to specify that documents without last-modified dates should be considered for caching, even without a last-modified date. If neither a last-modified date printing dates. The echo Element This command prints one of the include variables defined below. If the variable is unset, the result is determined by the SSIUndefinedEcho directive. Any dates printed

ends 2020-07-25 @enduml 10.1.4 Start/End It is possible to define both absolutely, by specifying dates: @startuml Project starts 2020-07-01 [Prototype design] starts 2020-07-01 [Test prototype] starts Responsibilities +++- Location ++ CV Upload Done +++ CV Updated ++++ Spelling & Grammar ++++ Check dates ---- Skills +++ Recruitment sites chosen @endwbs PlantUML 语言参考指引 (1.2020.22) 164 / 294 12.4 Removing

值，那么该模型已经被软删除了。要启用模型的软删除功能，可以使用模型上的 Illuminate\Database\Eloquent\SoftDeletestrait 并添加 deleted_at 列到$dates 属性： dates = ['deleted_at']; } 当然，应该添加 deleted_at 列到数据表。Laravel Schema 构建器包含一个帮助函数来创建该列： Schema::table('flights' updated_at 列的值为 Carbon 实例，该类继承自 PHP 原生的 Datetime 类，并提供了各种有用的方法。 你可以自定义哪些字段被自动调整修改，甚至可以通过重写模型中的$dates 属性完全禁止调整：