Foreach function question... Specifically PHP!

[EnVy_28]

foreach function without argument? Would it work?

 

I already tried it and it worked! LOL but I'm kinda confuse why? So, I have a stdClass object which can be extracted using foreach right? for example:

Array(    [0] => stdClass Object        (            [username] => derp            [password] => derppass            [email] => derpmail        ))

can be extracted like this: (assuming the array name is $array)

foreach($array as $arr){    echo $arr->username . '<br>';    echo $arr->password. '<br>';    echo $arr->email. '<br>';}

But what I did is I didn't put any argument in foreach and called it outside the function like this:

foreach($array as $arr){    //empty lol}echo $arr->username;echo $arr->password;echo $arr->email;

and it still worked! Dont have any error, but i think thats because my error_reporting setting is set to production value....

 

Is this safe to use?

[Megahurts]

foreach($array as $arr){    echo $arr->username . '<br>';    echo $arr->password. '<br>';    echo $arr->email. '<br>';}

This way you'll echo each object inside the array, if for exmaple the array contained 5 objects.

foreach($array as $arr){    //empty lol}echo $arr->username;echo $arr->password;echo $arr->email;

This will only echo the last object inside the array (because the foreach is assigning the 'current' object of the array to $arr, and it actually looped on all of them, so you get the last object) .  So if for example the array contained 5 objects, you'll only see the information of the last object being echo'd.

 

So if it's only 1 object, why do you need the array? Also if the array have more than one object, you can access an object explicitly without a 'foreach' if you know the index of it, I'm not very familiar with php but it would probably go as ArrayName[objectIndex] ($array[2] will get you the 3rd element in the array)

[EnVy_28]

So if it's only 1 object, why do you need the array? Also if the array have more than one object, you can access an object explicitly without a 'foreach' if you know the index of it.

 

No, unfortunately that's what I thought and i knew, but, without foreach, it give me nothing as a result, but when try to print_r(), it gives me an "Array"... if you know what I mean.. Like this:

Array()

[alpenwasser]

Is this safe to use?

I think not.

To quote the official doc: (source)

Warning

Reference of a $value and the last array element remain even after the foreach loop. It is recommended to destroy it by unset().

It seems that in this case, the second part of that statement comes into play. If you

add a second element to the first array like this:

<?php    $testarr=array    (	0 => array		(			'username' => 'derp',			'password' => 'derppass',			'email' => 'derpmail'		),	1 => array		(			'username' => 'derp2',			'password' => 'derppass2',			'email' => 'derpmail2'		)    );	foreach ($testarr as $arr) {}	echo $arr['username'];	echo $arr['password'];	echo $arr['email'];?>

it will echo the elements of $array[1], because the last element persists (meaning

$arr has not gone out of scope, it just hangs around as the last value it was in

the foreach loop).

You might also find these pages about foreach and variable scope of use:

(link 1, link 2).

[Megahurts]

You won't need a foreach loop and an array, if it's only 1 object.

 

Something like this should work:

 

$me = new Person('boring', '99', 26);
echo $me->age;

 

Also, this might be of use to you.

[EnVy_28]

Sorry for late reply, I'm really busy with this...

 

Anyway... How about if I make it like this? Would it work?

<?php    $testarr=array    (	0 => array		(			'username' => 'derp',			'password' => 'derppass',			'email' => 'derpmail'		),	1 => array		(			'username' => 'derp2',			'password' => 'derppass2',			'email' => 'derpmail2'		)    ); 	foreach ($testarr as $arr) {            $lol1 = $arr['username'];            $lol2 = $arr['password'];            $lol3 = $arr['email'];        } 	echo $lol1;	echo $lol2;	echo $lol3;?>

[alpenwasser]

Sorry for late reply, I'm really busy with this...

 

Anyway... How about if I make it like this? Would it work?

I suppose that depends on your definition of "work", just try it out

and see for yourself. You should get the same result as in my example

(I do).

While this is slightly less intransparent, it still relies on the fact

that foreach doesn't have its own scope. I don't really see why you'd want

to do this (iterating over an array with foreach only to give out the last

element in that array seems kind of pointless), and I certainly wouldn't

recommend it (very bad practice).

Just because you can do something, doesn't mean you should.

EDIT:

For giving out the last element of an array in PHP, I recommend either

array_pop() or end().

Read the docs and judge for yourself which one makes more sense for you.