August 2013
Intermediate to advanced
140 pages
1h 49m
English
Content preview from PHP Quick Scripting Reference
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CHAPTER 18
Type Hinting
PHP relies on the proper documentation of functions for developers to know what arguments a function can take. To simplify this PHP 5 introduced type hinting, which allows a function to specify the type of arguments it accepts. Allowed types include classes, interfaces and the pseudo types array and callable.
| Name | Description |
|---|---|
| class name | Argument must be an object of this class or a child. |
| interface name | Argument must be an object implementing this interface. |
| array | Argument must be an array. |
| callable | Argument must be callable as a function. |
A type hint is set by prefixing the parameter with ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.