$var1 = 'hello';
$var2 = $var1; // In C the variable var2 is created in memory right here
$var2 = 'bye'; // In PHP the variable var2 is created in memory here, up until now it still uses the same location of memory as var1
So in general, references should only be used if you want to work with the original variable, as it does not save memory or processing time.
Question
balupton
It seems that a lot or even most php programmers just jumped in and never read the manual or even know basic syntax...
The ones I see all the time are:
Not checking variable existence by just doing
instead of the correct
which will not return a notice exception
Reference: http://au3.php.net/manual/en/language.variables.php
Using short tags
instead of the proper
which will run on many more servers
Reference: http://php.net/manual/en/language.basic-syntax.php
Also the misuse of double quotes
should be
which saves processing time
Reference: http://php.net/manual/en/language.types.st...g.syntax.single
Those are just some of the most common ones.
So what i'm asking is:
Why didn't you know this stuff if you didn't before hand?
Or if you did know this, then why do you think things like this are so ignored?
Note:
The option "I thought I did until now." should read "No, I'm a professional developer."
The option "No." should read "No, I'm a unprofessional developer."
-------------------
This thread has kinda turned into a tips thread, so here are a collection of tips that have been collected so far.
Single quotes vs Double quotes
https://www.neowin.net/forum/index.php?show...amp;p=588249172
Switch statements VS if then else statements
Thanks to redFX for reminding us of that:
https://www.neowin.net/forum/index.php?show...amp;p=588271991
If then else statements VS ternary statements
Also applies for $var =, instead of echo. Thanks to redFX for that:
https://www.neowin.net/forum/index.php?show...amp;p=588271991
Pre-Increment VS Post-Increment
This applies everywhere, so in for loops etc. Thanks to phpmozzer for that:
https://www.neowin.net/forum/index.php?show...amp;p=588271806
Loops in order of speed
for, foreach, while, do-while. Thanks to redFX for that:
https://www.neowin.net/forum/index.php?show...amp;p=588271808
Strict (===) comparison is faster than loose (==) comparison.
https://www.neowin.net/forum/index.php?show...amp;p=588271983
Instantiating classes
Thanks to http://www.php.lt/benchmark/phpbench.php
For loops and size calculations
https://www.neowin.net/forum/index.php?show...amp;p=588249623
Variable declarations and memory
So in general, references should only be used if you want to work with the original variable, as it does not save memory or processing time.
https://www.neowin.net/forum/index.php?show...amp;p=588249172
If you know any others, feel free to post them :)
Edited by baluptonLink to comment
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