Day 2 - Variables - Become PHP Expert in 30 days

[admin]

Post example links, experiment (best way to learn) and discuss. No cut and paste please. Type the examples yourself, make mistake, try to fix it yourself, , think, refer back, post you code, so others can fix it for you. Lean from your mistakes (or others).

[sherlyk]

http://php.flashwebhost.com/sherly/add.php

<?php

$M = 20;
$N = 50;
echo $M + $N;

[admin]

http://php.flashwebhost.com/sherly/add.php

<?php

$M = 20;
$N = 50;
echo $M + $N;

It is always better to use descriptive name for variables, so you what what is stored in a variable. For example, to store mark, we use variable $mark

It is ok, but better use descriptive names for variables. One letter variable names can be confusing in most cases.

[annie]

I got an error while adding break in http://php.flashwebhost.com/annie/company.php

Parse error:  syntax error, unexpected '>' in /home/fwhphp/public_html/annie/company.php on line 3 

 <?php
$companyname = 'Relience';
echo $companyname <br> ; 
$companyname = 'Whirpool'; 
echo $companyname ;

[sherlyk]

I got an error http://php.flashwebhost.com/sherly/name.php

Parse error:  syntax error, unexpected '' ;' (T_ENCAPSED_AND_WHITESPACE), expecting ',' or ';' in /home/fwhphp/public_html/sherly/name.php on line 7

<?php
$my_string = 'Hi Meera. My anme is Neena';
$my_number = 8;
$my_letter = N;
echo $my_string;
echo $my_number;
echo $my_letter' ;

[admin]

I got an error http://php.flashwebhost.com/sherly/name.php

<?php
$my_string = 'Hi Meera. My anme is Neena';
$my_number = 8;
$my_letter = N;
echo $my_string;
echo $my_number;
echo $my_letter' ;

Good, more friendly code with some string.

<?php

$my_string = 'Hi Meera. My anme is Neena';
$my_number = 8;
$my_letter = N;

echo '<h1>About Me</h1>';
echo $my_string;
echo '<br>';
echo 'My number is ' . $my_number;
echo '<br>';
echo 'My Name start with ' . $my_letter' ;
echo '<br>';

[admin]

I got an error while adding break in http://php.flashwebhost.com/annie/company.php

Parse error:  syntax error, unexpected '>' in /home/fwhphp/public_html/annie/company.php on line 3 

 <?php
$companyname = 'Relience';
echo $companyname <br> ; 
$companyname = 'Whirpool'; 
echo $companyname ;

Problem is on line number 3.

echo $companyname <br> ;

To fix, replace that line with

echo $companyname .  '<br>' ;

$companyname is a variable. We use DOT to join it with string <br>. String should start with a quote, end with a quote.

As for variable name, proper naming convention is $companyName, because it is two words, and easy to read.


Fixed code

<?php

$companyName = 'Relience';

echo $companyname .  '<br>'; 

// here we store another text to same variable $companyName
$companyName = 'Whirpool'; 

echo $companyname ;

[annie]

http://php.flashwebhost.com/annie/day_2_variables_3.php

 
<?php
$name = 'George';
$Rank = 1;
$Mark = 800;
$School = 'Raja Giri Public School';
echo $name . ' from ' . $School . ' got Rank ' . $Rank . ' He have ' . $Mark . 'Marks';

[sherlyk]

I didn't get the correct answer. http://php.flashwebhost.com/sherly/variable.php

<?php

$variable12 = $variable7 + $variable5;
echo $variable7;
echo " + ";
echo $variable5;
echo " = ";
echo $variable12;

[sherlyk]

http://php.flashwebhost.com/sherly/age.php

<?php

$name = 'Joseph';
$yearBorn = 1975;
$currentYear = 2014;
$age = $currentYear - $yearBorn;

print ("$name is $age years old. ")