Section 6 - Arrays in PHP
Posted by murray-78034604
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July 18, 2013 10:00AM |
@Murray
I find it helpful to use a notebook where I write the topic as a header and write important notes to remember about that particular topic.
I even write the code as an example of how I understood the topic's concept. Sometimes when you read and practice something you tend to remember it for a short while, but when you create notes you remember it longer and you'll have a point of reference. i.e consider the following example about creating a function that creates a HTML table with variables inside cells: #THIS WILL BE IN MY NOTES UNDER THE HEADING FUNCTIONS & SUB-HEADING TABLES;
I find making notes extremely helpful and I hope this helps you too...
I find it helpful to use a notebook where I write the topic as a header and write important notes to remember about that particular topic.
I even write the code as an example of how I understood the topic's concept. Sometimes when you read and practice something you tend to remember it for a short while, but when you create notes you remember it longer and you'll have a point of reference. i.e consider the following example about creating a function that creates a HTML table with variables inside cells: #THIS WILL BE IN MY NOTES UNDER THE HEADING FUNCTIONS & SUB-HEADING TABLES;
Language: PHP<?php echo "<h1><span style=\"color: red;\">TABLE PRINT FUNCTION</h1></span>"; $txt0 = "Things to know bout me"; $txt1 = "I Love my University UNISA & UNIX/Linux OS"; $txt2 = "I know HTML5, CSS3 & JavaScript"; $txt3 = "I am studying PHP"; function tableWrap($txt0, $txt1, $txt2, $txt3,){ echo "<p><span style=\"color: blue;\">things to know about me!!</p></br>"; echo "<table style=\"border: 1px solid #000;\">"; echo "<tr><th style=\"border: 1px solid #000;\">".$txt0."</tr></th>"; echo "<tr><td style=\"border: 1px solid #000;\">".$txt1."</tr></td>"; echo "<tr><td style=\"border: 1px solid #000;\">".$txt2."</tr></td>"; echo "<tr><td style=\"border: 1px solid #000;\">".$txt3."</tr></td>"; echo "</table>"; } #function call on variables listed above tableWrap($txt1, $txt1, $txt2, $txt3); ?>
I find making notes extremely helpful and I hope this helps you too...
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July 18, 2013 04:27PM |
@78111986Yusuf
Yes I have a counter book an a pen that I use along side my laptop.
After finishing a topic I write down areas of interest and I write them according to my understanding i.e under the topic functions I took not of the Global keyword scope (calling variables inside functions)
and the static keyword for increasing the life span of a variable every time the function is called... I prefer hand written notes as the double up as revision too...
Yes I have a counter book an a pen that I use along side my laptop.
After finishing a topic I write down areas of interest and I write them according to my understanding i.e under the topic functions I took not of the Global keyword scope (calling variables inside functions)
Language: PHP<?php $a = 1; $b = 2; function Sum(){ global $a, $b; #the "global" keyword is useful for referencing variables outside of the function';s scope, and you can list as many variables as you like as long as you separate with commas $b = $a + $b; } Sum(); echo $b; ?>
and the static keyword for increasing the life span of a variable every time the function is called... I prefer hand written notes as the double up as revision too...
Language: PHP<?php function test(){ static $a = 0; #The "static" keyword remembers the variable $a giving it a longer life span echo $a; $a++; #each time this function is called it is incremented and the static keyword will remember that number each time the function is called } ?>
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Re: Section 6 - Arrays in PHP July 19, 2013 04:58PM |
I've completed this section 
@Sipho
I must agree, keeping notes really helps you to remember things for longer and as you said - great point of reference!
@Sipho
I must agree, keeping notes really helps you to remember things for longer and as you said - great point of reference!
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July 22, 2013 05:35PM |
Please paste your code using formatted code so we can see why it wont print/echo your selected year and why you wasted too much time on it?
Language: PHP<?php $yearOfBirth = array( "Sipho" => 2000, "Charles" => 2001, "Rushil" => 2002 ); function myAge ($array, $key){ #A function called myAge() that returns your age $currentYear = 2013; foreach($array as $key=>$year){ #Here we loop through an associative array to find a match for your date of birth $myYear = $year; #The output from foreach is initiated to the $myYear variable. } return $currentYear - $myYear; #Here we return the calculation to the call } $myAge = myAge($yearOfBirth, "Charles" ); #Here I initiate the variable $myAge with the produce returned from the myAge() function.. echo "Hi my name is Charles and Iam ".$myAge."yrs old"; #Now we print your age!! ?>
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Re: Section 6 - Arrays in PHP July 22, 2013 10:08PM |
Hi Sipho,
Thanks for making take it on again. Couldn't get control of THE FOR LOOP to list and print years.
Amazing What playing around with $_POST[ 'and_any_variables_can _do']. Come on arrays!!!!
<?php
for ($year = date("Y"; $year>=1970; $year--) {
?>
<option value=<?php print $year; ?> ">< ? php
print $year; ?></option>
<?php
}
?>
Thanks for making take it on again. Couldn't get control of THE FOR LOOP to list and print years.
Amazing What playing around with $_POST[ 'and_any_variables_can _do']. Come on arrays!!!!
<?php
for ($year = date("Y"
; $year>=1970; $year--) {
?>
<option value=<?php print $year; ?> ">< ? php
print $year; ?></option>
<?php
}
?>
|
July 23, 2013 08:58AM |
Hi Charles can you please use formatted code, it hard to read you code..
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July 23, 2013 10:43AM |
Do you guys understand looping through multidimensional arrays? 
Language: PHP<?php $superHeros = array( $Hulk = array("Skill"=>"Superhuman strength", "Skin Colour" => "Green", "Country"=>"United States"), $Superman = array("Skill"=>"Superhuman Strength", "Skin Colour"=>"White", "Country"=>"United States"), $Tony_Stark = array("Skill"=>"Nano_Technology", "Skin Color"=>"White", "Country"=>"United States") ); echo "My Question is how do I loop through the above Multidimensional array printing the Super Hero';s name and traits?"; ?>
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July 23, 2013 01:09PM |
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July 23, 2013 03:00PM |
Below is my approach to looping multidimensional arrays:
If you try my solution you'll get the following output:
AKA = BIG BOY
Traits = Superhuman Strength
Occupation = Superhero
Skin Color = Green
Known Weakness = N/A
Country of Birth = United States
AKA = Clark Kent
Traits = Superhuman Strength
Occupation = Superhero
Skin Color = White
Known Weakness = Cryptonite
Country of Birth = United States
AKA = Tony Stark
Traits = Nano Technology
Occupation = Superhero
Skin Color = White
Known Weakness = Valnurable when outside of suit
Country of Birth = United States
Language: PHP<!DOCTYPE HTML> <HTML> <HEAD> <TITLE>Array_Loop_Print</TITLE> </HEAD> <BODY> <?PHP $superheros=array( $hulk=array( "AKA"=>"BIG BOY", "Traits"=>"Superhuman Strength", "Occupation"=>"Superhero", "Skin Color"=>"Green", "Known Weakness"=>"N/A", "Country of Birth"=>"United States" ), $superman=array( "AKA"=>"Clark Kent", "Traits"=>"Superhuman Strength", "Occupation"=>"Superhero", "Skin Color"=>"White", "Known Weakness"=>"Cryptonite", "Country of Birth"=>"United States" ), $Ironman=array( "AKA"=>"Tony Stark", "Traits"=>"Nano Technology", "Occupation"=>"Superhero", "Skin Color"=>"White", "Known Weakness"=>"Valnurable when outside of suit", "Country of Birth"=>"United States" ), ); foreach($superheros as $name){ while(list($key, $value)=each($name)){ echo $key ." = ". $value."<br>"; } echo "<br>"; } ?> </BODY> </HTML>
If you try my solution you'll get the following output:
AKA = BIG BOY
Traits = Superhuman Strength
Occupation = Superhero
Skin Color = Green
Known Weakness = N/A
Country of Birth = United States
AKA = Clark Kent
Traits = Superhuman Strength
Occupation = Superhero
Skin Color = White
Known Weakness = Cryptonite
Country of Birth = United States
AKA = Tony Stark
Traits = Nano Technology
Occupation = Superhero
Skin Color = White
Known Weakness = Valnurable when outside of suit
Country of Birth = United States
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July 23, 2013 04:16PM |
@Rushil-77923553
Check out the official PHP: Manual
Also pay close attention to the each() function:
I hope this explains things better, I also recommend a book called SAM's Teach Yourself PHP, MySQL & Apache2......
Check out the official PHP: Manual
Also pay close attention to the each() function:
Language: PHP<?php $myArray = array( $array1 = array("name"=>"firstArray"), $array2 = array("name"=>"secondArray") ); foreach($myArray as $array){ #this is the one we';re all familier with (no need to explain here) while(list($key,$value)=each($array)){ #my condition that will execute the following expression as long as true echo "I am the ".$value." and i live inside ".$key; #pay close attention to how I use the list() & each() functions to list every instance and value of each $array occurance } } ?>
I hope this explains things better, I also recommend a book called SAM's Teach Yourself PHP, MySQL & Apache2......
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July 23, 2013 05:32PM |
I like your approach but I'd change just a small bit, observe
Now your code echoes the following:
CodeName: Hulk
Skill - > Superhuman strength
Skin Colour - > Green
Country - > United States
CodeName: Superman
Skill - > Superhuman Strength
Skin Colour - > White
Country - > United States
CodeName: Tony Stark
Skill - > Nano_Technology
Skin Color - > White
Country - > United States
I must say I like your manual approach man, thumbs up bro (@Rushil-77923553)
Language: PHP<?php $superHeros = array( "Hulk" => array("Skill"=>"Superhuman strength", "Skin Colour" => "Green", "Country"=>"United States"), "Superman" => array("Skill"=>"Superhuman Strength", "Skin Colour"=>"White", "Country"=>"United States"), "Tony Stark" => array("Skill"=>"Nano_Technology", "Skin Color"=>"White", "Country"=>"United States") ); foreach ($superHeros as $name => $traits) { echo "CodeName: ".$name . "<br>"; foreach ($traits as $traits => $type) { echo $traits." - > ".$type."<br>"; } echo "<br>"; } ?>
Now your code echoes the following:
CodeName: Hulk
Skill - > Superhuman strength
Skin Colour - > Green
Country - > United States
CodeName: Superman
Skill - > Superhuman Strength
Skin Colour - > White
Country - > United States
CodeName: Tony Stark
Skill - > Nano_Technology
Skin Color - > White
Country - > United States
I must say I like your manual approach man, thumbs up bro (@Rushil-77923553)
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July 23, 2013 05:39PM |
Remember ultimately that arrays are becomes useful when you use variables, as opposed to hard coding it in. For example, capturing choices from a web form e.g. "which colour do you like?" in an array, sending it on, extracting it, and using it. Sounds easy, but can be tricky
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Re: Section 6 - Arrays in PHP July 23, 2013 05:58PM |
@72903694_Sipho and Rushil-77923553
i,ve been looking throw your conversation and aim thinking "damm this multidimensional arrays are on steroids"
so this multidimensional array is more like an array inside an array ryt?
#i think i should get my text book aim really missing out of the good staff
i,ve been looking throw your conversation and aim thinking "damm this multidimensional arrays are on steroids"
so this multidimensional array is more like an array inside an array ryt?
#i think i should get my text book aim really missing out of the good staff
|
July 24, 2013 12:43PM |
@murray-78034604
Thanks for your reply, I am glad you finding the scripts useful and helpful..
Keep your sleeves rolled up, when you're ready check out the numbersGame section on the forum and see how you can help.
Thanks for your reply, I am glad you finding the scripts useful and helpful..
Keep your sleeves rolled up, when you're ready check out the numbersGame section on the forum and see how you can help.
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Re: Section 6 - Arrays in PHP July 26, 2013 09:38AM |
Finished with this section!!
This was really easier than the previous sections, gave me hope again
This was really easier than the previous sections, gave me hope again
|
July 27, 2013 08:58PM |
I have finished this section, I found it enjoyable, although I got a little side tracked looking up the names of the band that I should have known
|
July 30, 2013 03:58PM |
Sorry Papias am not sure I understand your question bro, do you mean surround as in :
In your code I'd change the href targets by including the http:// to the $website i.e.
Language: PHP<?PHP #the following must be enabled in the php.ini otherwise stick to the <?PHP?> tags....... $status="I am surrounded by a bunch of <?PHP?> tags, these tags could also be written in C# style like <%%> or just like this <??>"; echo "I hope the above explanation helps you bud"; ?>
In your code I'd change the href targets by including the http:// to the $website i.e.
Language: PHP$mySites = array( "unisa" => "http://www.unisa.ac.za", "codecademy" => "http://www.codecademy.co.za" ); foreach ($mySites as $key => $value){ echo "The ".strtoupper($name)." website can be found "."<a href=\"".$value."\">here</a><br>"; }
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July 31, 2013 09:37AM |
If you're writing a script that creates HTML on the fly, it makes logical sence to place the <pre></pre> tags on the section of your script that outputs the HTML i.e echo/print. So I think that's the reason why Rush used the tags on his echo/print function.
Language: PHP<?PHP #Placing the HTML <pre></pre> tags here will result in an error as this section is the actual PHP script and the PHP parser wont know what to do with it.. $myMovies = array("300", "Troy", "Spartacus" ); for (counter=0; counter <=3; counter++){ if($myMovies[counter]){ echo "<pre>".$myMovies[counter]."</pre><br>"; #This section feeds HTML to the browser so it makes sence to place the HTML <pre></pre> tags here... } } ?>
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Re: Section 6 - Arrays in PHP July 31, 2013 07:46PM |
I have read and understood this section.
I have to say it really bugged me the amount of code needed back in Section 4: Working with HTML forms, where data was kept from checkboxes selected by users. Think its the very last section of Section 4: PHP and Checkboxes.
Anyway, so I went back and re-wrote the code, in a way I understood it using everything I have learnt so far (arrays, loops, etc.)
I have to say, you can read and read a million times but the key really is practice!!!
So here's my code: Its not that much shorter, but I understand it and that's the important thing
The PHP bit:
And the HTML form bit:
My final word: Arrays are awesome!!!!!!
PS: Starting functions next and i'm sure i can shorten the code much more once i've mastered it.
S
I have to say it really bugged me the amount of code needed back in Section 4: Working with HTML forms, where data was kept from checkboxes selected by users. Think its the very last section of Section 4: PHP and Checkboxes.
Anyway, so I went back and re-wrote the code, in a way I understood it using everything I have learnt so far (arrays, loops, etc.)
I have to say, you can read and read a million times but the key really is practice!!!
So here's my code: Its not that much shorter, but I understand it and that's the important thing
The PHP bit:
Language: PHP<?PHP $status = array(';unchecked';,';unchecked';,';unchecked';,';unchecked';,';unchecked';); if (isset($_POST[';Submit1';])) { if (isset($_POST[';box';])) //checking if the array exist incase no checkboxes were selected initially { $checked = $_POST[';box';]; //returning an aray $checked of checkboxes selected for($i=0; $i < count($checked); $i++) //looping through the $checked array { //echo "Selected " . $checked[$i] . "<br>"; //checking purposes only that the correct checkbox value is displayed. switch($checked[$i]) { case ';net';: $status[0] = ';checked';; print "Vbasic.net was checked <br>"; //checking purposes only break; case ';word';: $status[1] = ';checked';; print "Microsoft Word was checked <br>"; //checking purposes only break; case ';excel';: $status[2] = ';checked';; print "Microsoft Excel was checked <br>"; //checking purposes only break; case ';web';: $status[3] = ';checked';; print "Web Design was checked <br>"; //checking purposes only break; case ';php';: $status[4] = ';checked';; print "PHP for beginners was checked <br>"; //checking purposes only break; } } } //else //{ //print "no array exists"; //this is for checking purposes only //} } ?>
And the HTML form bit:
Language: HTML<FORM NAME ="form1" METHOD ="POST" ACTION ="testing2.php"> <Input type = ';Checkbox'; Name ="box[]" value ="net" <?PHP print $status[0]; ?>>Visual Basic .NET <P> <Input type = ';Checkbox'; Name ="box[]" value="word" <?PHP print $status[1]; ?>>Microsoft Word <P> <Input type = ';Checkbox'; Name ="box[]" value="excel" <?PHP print $status[2]; ?>>Microsoft Excel <P> <Input type = ';Checkbox'; Name ="box[]" value="web" <?PHP print $status[3]; ?>>Web Design <P> <Input type = ';Checkbox'; Name ="box[]" value="php" <?PHP print $status[4]; ?>>PHP for the Beginner <P> <INPUT TYPE = "Submit" Name = "Submit1" VALUE = "Choose your books"> </FORM>
My final word: Arrays are awesome!!!!!!
PS: Starting functions next and i'm sure i can shorten the code much more once i've mastered it.
S
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Re: Section 6 - Arrays in PHP July 31, 2013 08:22PM |
sometimes the simplest things get be real confusing like the code below from home-learn website:
<?php
$seasons = array("Autumn", "Winter", "Spring", "Summer";
$array_count = count($seasons);
for ($key_Number = 0; $key_Number < $array_count; $key_Number++) {
print $seasons[$key_Number];
}
?>
i run the script and the output was a bit confusing because i expected to see the output of the elements in the $seasons array
but instead this:
AutumnWinterSpringSummer
so i figured if you want to print the number of elements you should print $array_count by its self like;
<?PHP
$seasons = array("Autumn","winter","spring","summer";
$array_count =count($seasons);
for($key_Number= 0;$key_Number <$array_count;$key_Number++){
print $seasons[$key_Number];
}
print $array_count;
?>
<?php
$seasons = array("Autumn", "Winter", "Spring", "Summer"
;
$array_count = count($seasons);
for ($key_Number = 0; $key_Number < $array_count; $key_Number++) {
print $seasons[$key_Number];
}
?>
i run the script and the output was a bit confusing because i expected to see the output of the elements in the $seasons array
but instead this:
AutumnWinterSpringSummer
so i figured if you want to print the number of elements you should print $array_count by its self like;
<?PHP
$seasons = array("Autumn","winter","spring","summer"
;
$array_count =count($seasons);
for($key_Number= 0;$key_Number <$array_count;$key_Number++){
print $seasons[$key_Number];
}
print $array_count;
?>
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August 01, 2013 09:20AM |
@glen78134323
That's an interesting observation but if you want the "$seasons" array's output to have a bit of meaning to you, just add an HTML "<br>" tag at the end of your "print" statement.
you should get the following output:
Autumn
Winter
Spring
Summer
Sweeto and thanx for posting this useful info. Its much, much better than just saying "I complited this section"
That's an interesting observation but if you want the "$seasons" array's output to have a bit of meaning to you, just add an HTML "<br>" tag at the end of your "print" statement.
Language: PHP<?php $seasons = array("Autumn", "Winter", "Spring", "Summer"); $array_count = count($seasons); for ($key_Number = 0; $key_Number < $array_count; $key_Number++) { print $seasons[$key_Number]."<br>"; } ?>
you should get the following output:
Autumn
Winter
Spring
Summer
Sweeto
and thanx for posting this useful info. Its much, much better than just saying "I complited this section"|
Re: Section 6 - Arrays in PHP August 06, 2013 07:07PM |
Ok, I see you guys had fun with Arrays but as for me its hectic
nothing gets executed shouldn't the be anything executed of did I miss something out?
Arrays and PHP For Each Loops
<?php
$full_name = array( );
$Full_name["David"]="Gilmour";
$Full_name["Nick"]="Mason";
$Full_name["Roger"]="Waters";
$Full_name["Richard"]="Wright";
foreach($full_name as $key_name => $key_value) {
print"Key = ".$key_name. "Value = ".$key_value. "<BR>";
}
?>
Please help
nothing gets executed shouldn't the be anything executed of did I miss something out?
Arrays and PHP For Each Loops
<?php
$full_name = array( );
$Full_name["David"]="Gilmour";
$Full_name["Nick"]="Mason";
$Full_name["Roger"]="Waters";
$Full_name["Richard"]="Wright";
foreach($full_name as $key_name => $key_value) {
print"Key = ".$key_name. "Value = ".$key_value. "<BR>";
}
?>
Please help
|
August 06, 2013 07:32PM |
@gouwem-77858204
Going through your code it quickly be came clear that you're adding names into a wrong array() "$Full_name" instead of the correct array() "$full_name". Array names are case sensitive bud!! Also add a space between "print" and "Key=........" and you have one too many double quotes (dont put variables in double quotes as doing so will render them useless "$var" do this instead $var."some text here".$var."<br />" ). OH!! tja and please use formated code next time when posting scripts coz its hard to read you code as it is.. i.e observe the following corrections:
I hope the above makes sense...?
Going through your code it quickly be came clear that you're adding names into a wrong array() "$Full_name" instead of the correct array() "$full_name". Array names are case sensitive bud!! Also add a space between "print" and "Key=........" and you have one too many double quotes (dont put variables in double quotes as doing so will render them useless "$var"
do this instead $var."some text here".$var."<br />" ). OH!! tja and please use formated code next time when posting scripts coz its hard to read you code as it is.. i.e observe the following corrections:
Language: PHP<?php $full_name = array( ); $full_name["David"]="Gilmour"; $full_name["Nick"]="Mason"; $full_name["Roger"]="Waters"; $full_name["Richard"]="Wright"; foreach($full_name as $key_name => $key_value) { print "Key = ".$key_name." Value = ".$key_value."<br />"; } ?>
I hope the above makes sense...?
|
Re: Section 6 - Arrays in PHP August 09, 2013 05:09PM |
Getting worried that I may be falling behind.
Only starting with arrays today, but thank you to everyone for your posts. I think I can already see where I might get stuck, but now know that I won't sit with it for days thanks to everyone giving advice here! I am actually really looking forward to starting this section!
Only starting with arrays today, but thank you to everyone for your posts. I think I can already see where I might get stuck, but now know that I won't sit with it for days thanks to everyone giving advice here! I am actually really looking forward to starting this section!
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August 19, 2013 08:38AM |
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August 19, 2013 08:43AM |
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Re: Section 6 - Arrays in PHP August 19, 2013 09:58PM |
Thank you Mac. Read it, think I understand it... Will now practice it!
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