Comments on: How To Write A Function In PHP http://www.brandonsavage.net/how-to-write-a-function-in-php/ The personal blog of Brandon Savage. Contains entries of a personal and professional nature focusing on PHP, Apple, LAMP, MySQL and Washington, DC. Thu, 18 Mar 2010 20:17:39 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Brandon Savage http://www.brandonsavage.net/how-to-write-a-function-in-php/#comment-1740 Brandon Savage Mon, 26 Oct 2009 09:48:07 +0000 http://www.brandonsavage.net/?p=815#comment-1740 I always make the mistake of confusing print() with a function because it has a return value, unlike echo(). My bad! I always make the mistake of confusing print() with a function because it has a return value, unlike echo(). My bad!

]]> By: Samuel Folkes http://www.brandonsavage.net/how-to-write-a-function-in-php/#comment-1732 Samuel Folkes Mon, 26 Oct 2009 04:13:05 +0000 http://www.brandonsavage.net/?p=815#comment-1732 Excellent article. I just have one teensy tiny problem: print() is actually not a function. Its a language construct. That aside, good work! Excellent article. I just have one teensy tiny problem: print() is actually not a function. Its a language construct. That aside, good work!

]]> By: Bruce Weirdan http://www.brandonsavage.net/how-to-write-a-function-in-php/#comment-1568 Bruce Weirdan Mon, 12 Oct 2009 21:55:36 +0000 http://www.brandonsavage.net/?p=815#comment-1568 > Hey Bruce, I fixed that syntax error earlier, and it looks to be fixed in my version. Are you seeing it differently? No, I just had this tab opened since morning, and forgot to refresh prior to posting. > Hey Bruce, I fixed that syntax error earlier, and it looks to be fixed in my version. Are you seeing it differently?
No, I just had this tab opened since morning, and forgot to refresh prior to posting.

]]> By: Brandon Savage http://www.brandonsavage.net/how-to-write-a-function-in-php/#comment-1567 Brandon Savage Mon, 12 Oct 2009 21:39:45 +0000 http://www.brandonsavage.net/?p=815#comment-1567 Hey Bruce, I fixed that syntax error earlier, and it looks to be fixed in my version. Are you seeing it differently? Hey Bruce, I fixed that syntax error earlier, and it looks to be fixed in my version. Are you seeing it differently?

]]> By: Bruce Weirdan http://www.brandonsavage.net/how-to-write-a-function-in-php/#comment-1566 Bruce Weirdan Mon, 12 Oct 2009 21:36:36 +0000 http://www.brandonsavage.net/?p=815#comment-1566 > I think its important to say, that objects since PHP 5 always are passed by reference. Well, it's not true. In fact Brandon linked in this very blog post to the article by Sara Golemon that specifically deals with this very misconception. > I think its important to say, that objects since PHP 5 always are passed by reference.

Well, it’s not true. In fact Brandon linked in this very blog post to the article by Sara Golemon that specifically deals with this very misconception.

]]> By: Bruce Weirdan http://www.brandonsavage.net/how-to-write-a-function-in-php/#comment-1565 Bruce Weirdan Mon, 12 Oct 2009 21:32:55 +0000 http://www.brandonsavage.net/?p=815#comment-1565 > Bear in mind that if you want to assign some of your arguments > default values, it is best to place these arguments towards the > end of your function signature. The reason is that if you place > them at the front, you will have to assign them a null value. Unlike you imply this will not have the same effect as not passing the argument, as illustrated by the following example: [weirdan@home ~]$ php -r 'echo PHP_VERSION . PHP_EOL; function a($b = false, $c = false) { var_dump($b, $c); } a(null);' 5.2.8 NULL bool(false) [weirdan@home ~]$ As you can see, $b is null inside the function, just what was passed to the function. Your goodFunc example have a syntax error: function goodFunc($var2, $var1 == false) // <--- it should be $var1 = false > Bear in mind that if you want to assign some of your arguments
> default values, it is best to place these arguments towards the
> end of your function signature. The reason is that if you place
> them at the front, you will have to assign them a null value.
Unlike you imply this will not have the same effect as not passing the argument, as illustrated by the following example:

[weirdan@home ~]$ php -r ‘echo PHP_VERSION . PHP_EOL; function a($b = false, $c = false) { var_dump($b, $c); } a(null);’
5.2.8
NULL
bool(false)
[weirdan@home ~]$

As you can see, $b is null inside the function, just what was passed to the function.

Your goodFunc example have a syntax error:
function goodFunc($var2, $var1 == false) // <— it should be $var1 = false

]]> By: Brandon Savage http://www.brandonsavage.net/how-to-write-a-function-in-php/#comment-1564 Brandon Savage Mon, 12 Oct 2009 14:58:03 +0000 http://www.brandonsavage.net/?p=815#comment-1564 Sky, you caught a mistake I made and didn't catch when I was proofreading. Good eye! I've fixed the mistake. Sky, you caught a mistake I made and didn’t catch when I was proofreading. Good eye!

I’ve fixed the mistake.

]]> By: Sky http://www.brandonsavage.net/how-to-write-a-function-in-php/#comment-1563 Sky Mon, 12 Oct 2009 14:48:17 +0000 http://www.brandonsavage.net/?p=815#comment-1563 Hello Why do you use this : function goodFunc($var2, $var1 == false) When you can use this : function goodFunc($var2, $var1 = false) The default value of a variable is a definition, not a comparaison. Sry if i got something whrong. Hello

Why do you use this :
function goodFunc($var2, $var1 == false)

When you can use this :
function goodFunc($var2, $var1 = false)

The default value of a variable is a definition, not a comparaison.

Sry if i got something whrong.

]]> By: Ulf Wendel http://www.brandonsavage.net/how-to-write-a-function-in-php/#comment-1560 Ulf Wendel Mon, 12 Oct 2009 08:20:38 +0000 http://www.brandonsavage.net/?p=815#comment-1560 ... and if you are beginner and use ext/mysql you code crap. The current MySQL extension is ext/mysqli. The php.net manual tells you why. … and if you are beginner and use ext/mysql you code crap. The current MySQL extension is ext/mysqli. The php.net manual tells you why.

]]> By: Flyingmana http://www.brandonsavage.net/how-to-write-a-function-in-php/#comment-1559 Flyingmana Mon, 12 Oct 2009 07:21:29 +0000 http://www.brandonsavage.net/?p=815#comment-1559 I think its important to say, that objects since PHP 5 always are passed by reference. I think its important to say, that objects since PHP 5 always are passed by reference.

]]> By: Niels http://www.brandonsavage.net/how-to-write-a-function-in-php/#comment-1558 Niels Mon, 12 Oct 2009 05:53:21 +0000 http://www.brandonsavage.net/?p=815#comment-1558 Scripting is not a programming paradigm[1] like object-orientation or procedural ;-) It expresses just the fact that programs of a scripting language need not be compiled before execution. 1: http://en.wikipedia.org/wiki/Programming_paradigm Scripting is not a programming paradigm[1] like object-orientation or procedural ;-) It expresses just the fact that programs of a scripting language need not be compiled before execution.

1: http://en.wikipedia.org/wiki/Programming_paradigm

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