Using a function before defining it in PHP

Question

in C++, all functions must be defined before using them. In PHP, can I use a function before defining it? Will it be slower?

What are you talking about? The only "using" I know is in C#. — BoltClock
– BoltClock, Commented Jan 9, 2011 at 6:12
@taspeotis: Not everybody bothers to backtick their keywords. But good call. — BoltClock
– BoltClock, Commented Jan 9, 2011 at 6:21
@lovespring: using is a keyword in C#. What taspeotis means is that the word "using" in the English language does not always refer to using in C#. — AbdullahC
– AbdullahC, Commented Jan 9, 2011 at 7:46

futureal · Accepted Answer · 2011-01-09 17:06:52Z

11

Since PHP is an interpreted language—not a compiled one—the order does not usually matter, since the contents of the script are parsed prior to the code being executed. There are a few exceptions, particularly when the existence of a function is conditional on some other code being executed.

You can read about this topic in the PHP manual here: http://www.php.net/manual/en/functions.user-defined.php

edited Jan 9, 2011 at 17:06

user113292

answered Jan 9, 2011 at 6:14

futureal

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AbdullahC · Accepted Answer · 2011-01-09 06:20:00Z

3

In C++, we need to declare a function before using it. Not so in PHP: functions need not be defined before they are referenced.

answered Jan 9, 2011 at 6:20

AbdullahC

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