IRC log for #uphpu on 20100124

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04:03.29wpsinsane… so hard to believe that they just rescued another person in Haiti… 11 days after the earthquake!
04:03.56supernoviaholy cow
04:05.22wpsdefying science
04:09.54*** join/#uphpu romanovic-afk (n=romanovi@c-67-161-208-14.hsd1.ut.comcast.net)
04:43.06ZelutI'm not quite grokking 'references'. Anyone care to enlighten me?
04:44.13supernoviathank you, for enlightening me...
04:51.35Zelutsupernovia: not familiar with the term 'grok'?
04:51.45supernoviaI just googled it but yeah, not familiar
04:52.14Zelutohh, sorry.
04:52.26supernoviaanyway what references?
04:52.48Zeluthttp://us.php.net/manual/en/language.references.whatare.php
04:53.03Zelutassigning by, passing by, returning by references.
04:54.16supernoviaoh. passing by reference
04:54.49supernoviawell, I did a homework assignment on that and got an A, but that was my only experience with them. so I would say I don't grok em either
04:55.15DexterTheDragonZelut: so variables are stored in memory
04:56.06ZelutI feel like I kind of understand the concept of assigning by reference, ie; $a =& $b; $a & $b are identical. the both reference the same thing. $a doesn't reference $b, or visa versa but they are both assigned or pointing to the same value.
04:56.21Zelutit is the passing and returning in functions that I'm really not following.
04:56.43DexterTheDragonwhen you pass variables to functions (somefunction($a)) it makes a copy that the function uses
04:57.45DexterTheDragonI think an example might explain better
04:58.04supernoviawhat was the other option called again when you don't pass by ref but pass by ... ____
05:02.24DexterTheDragonZelut: http://pastebin.ca/1763638
05:03.50supernoviaoh yeah the other was pass by value
05:04.40supernoviaso if you say dosomething(to the value of a) then it doesn't change a, it only does something in that function. As opposed to dosomething(to a)
05:05.51supernoviawhere it would change "a" all over the place. right?  do something to the value of a = passing by value; do something to a = passing by reference
05:06.29DexterTheDragonyeah
05:06.42supernoviaand you differentiate between the two with an &
05:07.54Zelutok. I think that is making more sense.
05:08.03Zelutnot sure I could clearly explain it yet, but its starting to come together
05:08.41supernoviadosomething(to a picture of Zelut)  vs dosomething(to Zelut)
05:09.13supernovia:-p
05:09.28Zelutdosomethingto is where we use the & ?
05:10.03supernoviahttp://us.php.net/manual/en/language.references.pass.php -- use the & to pass by ref
05:15.23Zelutwhen is something like this used? ..always helps me understand better when I understand application
05:15.47supernoviawell, lets say you wanted a function that would calculate your yearly salary based on an hourly wage
05:15.58supernoviavs a function that adds a dollar to your hourly wage
05:17.22supernoviamaybe a dumb example but anyway. hope it helps. thanks DexterTheDragon too for your example. Now I might actually remember this long term.
05:17.33DexterTheDragonZelut: it tends to be a programming decision
05:18.08DexterTheDragonusually pass by value is fine
05:18.15Zelutfrom what I'm reading it looks like it can be a shortcut almost..
05:18.43DexterTheDragonyeah if your always doing something like $array = alterarray($array);
05:19.06DexterTheDragonthen you could switch it to pass by ref so you can just do alterarray($array);
05:19.44DexterTheDragonwhich is shorter but is also faster cause it doesn't have to copy $array going into the function and then copy the result back to $array
05:20.21Zelutok
05:21.07Zelutso in that respect it seems shorter and faster. what is the downside? why do I not want to use it?
05:22.35DexterTheDragonin that case I wouldn't say there's much of a downside
05:23.39DexterTheDragonpass by ref wouldn't be good for all cases cause usually the scope seperation is a good thing, i.e. you usually don't want a function to be able to alter values at will
05:24.25DexterTheDragoncause usually you pass some info to a function and get an answer back and it doesn't need the ability to change that info it got
05:24.42DexterTheDragonif that makes sense
05:24.49supernovialol wps
05:25.22wpsI have friends that won't eat after nine o'clock
05:25.25wpsthey're not happy
05:25.43supernoviaI know people who can eat after 9 and stay thin. They are lucky
05:25.44Zelut..yeah. sounds like there is a place for it. I'll keep that in mind.
05:27.04supernoviadoesn't stop me from the occasional late night hot cocoa though, or from dinner at applebees once a month ;o)
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05:45.50wpsso nice when code runs the first test
05:46.08wpss/runs/runs currectly on/
05:46.16ZelutI don't recall who it was that shared it with me, but I use 'php -l file.php' _all_ the time now.
05:47.15Zelutthat helps my code run correctly the first time-ish..
05:47.28wpsthat was jsmith-away
05:51.32supernoviahmm
05:52.14supernoviai can't find that in the manual - what do it do?
05:52.35supernovias/do it/does it/
05:54.22wpsman php
05:54.29wps-l syntax check only
05:54.40supernoviaoh I was looking at the online man. OK.
05:54.53supernovianeat.
05:56.33justincarmonywatch out of supernovia ..... she'll eat your brains! :P
05:57.09supernoviaWell, advil usually works ;-D
05:57.24justincarmonyhehe
05:57.31Zelut-l has been really helpful while I'm learning and testing syntax.
05:59.42wpsif you had to access a session var twice, would there be any performance benefit to assigning it to a variable and then accessing the variable?
06:01.05DexterTheDragonnot really. cause the session var's already in a variable
06:01.14wpsthat's what I thought
06:01.18wpsthanks
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