Zend check if file exists

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Accept all cookies Customize settings. As this is not possible in ZF2, it is now always required to supply an adapter. The above will test that a given email address is in the database table. The above will test that a given username is not in the database table.

When providing an array for the exclude clause, the! You can also provide a string to the exclude clause so you can use an operator other than! This can be useful for testing against composite keys. To fix this, the PSR-4 allows you to define that a contiguous series of one or more leading namespace and sub-namespace names corresponds to a "base directory".

For the code conforming to the PSR-4 standard, we can write and register an autoloader, which we will refer to as the "standard" autoloader:. The standard autoloader works as follows. Assuming that the class namespace can be mapped to the directory structure one-by-one, the function calculates the path to PHP file by transforming back-slashes namespace separators to forward slashes path separators and concatenating the resulting path with the absolute path to the directory where the library is located.

Then the function checks if such a PHP file really exists, and if so, includes it with the require statement. It is obvious, that the standard autoloader works slower than the class map autoloader. However, its advantage is that you don't need to maintain any class map, which is very convenient when you develop new code and add new classes to your application.

Zend Framework 3 conforms to PSR-4 standard, making it possible to use standard autoloading mechanism across all its components. Composer can generate autoloader functions both class map autoloaders and PSR-4 standard autoloaders for the code you install with it. Zend Framework 3 uses the autoloader implementation provided by Composer. To autoload PHP classes located in your own modules like Application module , you'll have to specify the autoload key in your composer.

Then the only thing need to be done is to include that file in your website entry script index. The autoload. Besides that, to make Composer generate the autoload. For example, lets look at the IndexController. Figure 3.