PHP6 - Arrays in PHP

I have completed this section

section completed.

Section completed
Must say everything so far is very nicely explained

Arrays are awesome guys.

$array = array(array('name'=>'innocent', 'surname'=>'langa', 'age'=>25),
array('name'=>'simo', 'surname'=>'zaca', 'age'=>24));

foreach ($array as $key => $value) {
if ($value == 25)
$array[$key]['winner'] = 'Yes';
}

Would this works guys i haven't testing.
What is the best way to walk an array.

Section completed.

This section is the main reason why I registered for this course. Arrays in PHP can be confusing when compared to other languages. The => operators do not actually test values but insert them.

innocent,

Your code does not work. You need to specify the age field in the if statement.

Language: PHP
$array = array(array(';name';=>';innocent';, ';surname';=>';langa';, ';age';=>25),
		array(';name';=>';simo';, ';surname';=>';zaca';, ';age';=>24));
 
foreach ($array as $key => $value) {
	if ($value[';age';] == 25) {
		$array[$key][';winner';] = ';Yes';;
		echo $array[$key][';winner';];
	}
}

I have completed this section. I found I could understand arrays fine. Although, 77586182 I found the code you put above confusing. I have never done php before so it looks more complex than the examples in the section. There are arrays within an array? Can you explain to me what is happening in the code above line by line? If it is not too much trouble? Just want to make better sense of how it is working.

Hi Sian,

The code above is a bit more complex than the examples from the php tutorials but you can find a better explanation on page 68 of the Beginning PHP5, Apache, And MySQL Web Development Textbook. Basically it is an array with two arrays inside as values. I will use the sample from the textbook first and then explain the code in my previous post.

Taken from page 68 of the text book.

You can also have arrays within arrays (also known as multi-dimensional arrays). In the earlier example,
you had two people sitting at one table. What if you pulled up another table and added a few more people
to the mix? How in the heck would you store everyone’s information and keep it all separate and
organized? Like this!

Language: PHP
<?php
$table1 = array(“husband” => array(“firstname”=>”Albert”,
“lastname”=>”Einstein”,
“age”=>124),
“wife” => array(“firstname”=>”Mileva”,
“lastname”=>”Einstein”,
“age”=>123));
//do the same for each table in your restaurant
?>

Then if someone asks you, “Hey, what are the first names of the couple sitting at table one?,” you can
easily print the information with a few simple echo statements:

Language: PHP
<?php
echo $table1[“husband”][“firstname”];
echo “ & “;
echo $table1[“wife”][“firstname”];
?>

This script would produce the output “Albert & Mileva.”

The code from my previous example is a multi-dimensional array. It contains two persons with a 'name', 'surname' and 'age'.

Language: PHP
$array = array(array(';name';=>';innocent';, ';surname';=>';langa';, ';age';=>25),
		array(';name';=>';simo';, ';surname';=>';zaca';, ';age';=>24));

The foreach loop checks each value in the multi-dimensional array ($array) and uses the $key variable as the current index. So the $key variable will be the index of the first person and then change to the index of the second person after the loop has executed once.

Language: PHP
foreach ($array as $key => $value) {

$value is the data of the current person that is being validated by the loop. On the first execution of the loop, $value will contain an array with the values of the first person (name="innocent", surname="langa", age="25".

The if statement checks if the age of the person is equal to 25. If the statement is true, a new field is added to the person array called "winner" with the value "Yes".

Language: PHP
        if ($value[';age';] == 25) {
		$array[$key][';winner';] = ';Yes';;
		echo $array[$key][';winner';];
	}

^^^ Thanks very helpful post

Edited by Mac: I have deleted your post because you have not read this....http://osprey.unisa.ac.za/phorum/read.php?570,162261

If I were to look for a certain value, let's say in the above example look which one of the two array's within the array has a key named "winner", how would you do that?
Obviously you would use an if statement to see if it can find the key named "winner" within the foreach function...

But how would the line look to print only the array with the key named "winner"???

My sincere apology mac, i did not read that post.

77471466_Alwyn, my solution would be

Language: PHP
$array = array(array(';name';=>';innocent';, ';surname';=>';langa';, ';age';=>25),
		array(';name';=>';simo';, ';surname';=>';zaca';, ';age';=>24));
 
foreach ($array as $key => $value) {
	if ($value[';age';] == 25) {
		$array[$key][';winner';] = ';Yes';;
		echo $array[$key][';winner';];
	}
}
 
while (list($name, $surname, $winner) = each($array)) {
   if (isset($winner)) {
      echo $winner;
  }
}

or if you know the key position

Language: PHP
echo $array[0][';winner';];

In fact there are many ways.

Thanks Innocent, much appreciated!
Where did you learn of the funcion "list" and "each" if I may ask?

Hi 77471466_Alwyn

In the book, on page 197 chapter 7
Especially when you want to get info about image uploaded.

77592972_innocent Wrote:
-------------------------------------------------------
> Hi 77471466_Alwyn
>
> In the book, on page 197 chapter 7
> Especially when you want to get info about image
> uploaded.


Thank you!

Done

Completed this section.

Something's bothering me, though. I can't get the list() example snippet (77592972_innocent) – pasted from above – to work.

Language: PHP
$array = array(array(';name';=>';innocent';, ';surname';=>';langa';, ';age';=>25),
		array(';name';=>';simo';, ';surname';=>';zaca';, ';age';=>24));
 
foreach ($array as $key => $value) {
	if ($value[';age';] == 25) {
		$array[$key][';winner';] = ';Yes';;
		echo $array[$key][';winner';];
	}
}
 
while (list($name, $surname, $winner) = each($array)) {
   if (isset($winner)) {
      echo $winner;
  }
}

I think there's something very wrong with it, since I get an 'undefined offset' error. When I print out the $name, $surname and $winner using the following echo statement:

Language: PHP
while (list($name, $surname, $winner) = each($array)) {
	echo ';name:';.$name.'; surname:';.$surname.'; winner:';.$winner;
....
}

I get undesirable results:

name: 1 surname: Array winner:

... only that one result.

I'm going to work with it a bit to see if I can see what's going wrong. I haven't used list() before, so not an expert, but does it maybe have something to do with the each($array) being the wrong thing to use with list(...)?

I will let you know if I figure out what's happening....

Thanks

@Alwyn

I would replace the while(list(...) = ...){} statement above with something that I think is simpler:

Language: PHP
//for every nested array inside of the main array
foreach($array as $nested_array){
 
        //check if the nested array we';re currently looking at has a key called ';winner';
	if(isset($nested_array[';winner';])){
 
       // tell everyone that this person is a winner
		echo $nested_array[';name';].'; ';.$nested_array[';surname';].'; is a winner';;
	}
}

...But maybe I am missing something special about list() that I've previously missed. I will explore a bit more.

Personally it's not the way I would have gone about setting and checking for 'winner', but it is interesting.

So far this is what i came up with but im still working on it.
Im sorry for the bug

Language: PHP
<?php
 
$array = array(array(';name';=>';innocent';, ';surname';=>';langa';, ';age';=>25),
		 array(';name';=>';simo';, ';surname';=>';zaca';, ';age';=>24));
 
foreach ($array as $key => &$value) {
	if ($value[';age';] == 25) {
		$array[$key][';winner';] = ';Yes';;
		//echo $array[$key][';winner';];
	}
}
$arr = array();
foreach($array as $key => $value) {
	if (is_array($value)) {
		foreach($value as $k => $v) {
			array_push($arr, $v);			
		}
	}
	else {
		array_push($arr, $value);
	}
}
 
reset($arr);
$innocent = array_chunk($arr, 4); 
$me = array_merge($innocent[0], $innocent[1]);
while(list($key, $winner) = each($me)) {
	if ($winner == ';Yes';)
		echo "There is a winner!";
} 
?>

Ive learned to create an array on a fly using functions

Language: PHP
function a() {
 $args = func_get_args();
 return $args;
}
 
//To create an array
$array = a(';a';, ';b';);
 
//Results
// array(';a';, ';b';)

I am done with this chapter.

I enjoyed these chapter much

Not forgetting spliting

I have completed this section.

An easy PHP foreach example:

Language: PHP
<?php
 
$movie = array( "title" => "Rear Window",
                "director" => "Alfred Hitchcock",
                "year" => 1954,
                "minutes" => 112 );
 
echo "<dl>";
 
foreach ( $movie as $key => $value ) {
  echo "<dt>$key:</dt>";
  echo "<dd>$value</dd>";
}
 
echo "</dl>";
?>

This will output:

Language: PHP
title:
    Rear Window
director:
    Alfred Hitchcock
year:
    1954
minutes:
    112

Another simple example to wish me a Happy Birthday:

Language: PHP
<?php
$name = array(';77585607';, ';Luke';, ';John';);
$bday = array(';6 March';, ';11 November';, ';26 January';);
$comment = array(';Happy Birthday to me';, ';No Comment';, ';No Comment';);
 
foreach($name as $key => $name)
{
echo $name." - ".$bday[$key]." - ".$comment[$key]."<br />\n"; 
}
?>

This will output:

Language: PHP
77585607 - 6 March - Happy Birthday to me
Luke - 11 November - No Comment
John - 26 January - No Comment

Completed this section.

Done and dusted!

Completed the section. Enjoyed the band mention it reminded me of the many ways PHP can be used.

Done and Dusted!

Arrays are awesome!, storing multiple variables in one :O

Completed this section