Old Solution:

$aArr = array("Have you ever seen",

"the beauty of the world.",

"The wonderful creation of the Lord." );

foreach($aArr as $sString) {

    print $sString;

}

Other Solution:

$aArr = array("Have you ever seen",

"the beauty of the world.",

"The wonderful creation of the Lord." );

$sString = implode(" ", $aArr);

print $sString;

In Action: I want to execute a linux command via PHP and get its result and extract the desire content. The example below will try to extract the ip address from the ifconfig command

exec("ifconfig", $aOutput);

$sTempString = implode(" ", $aOutput);

preg_match("/inet\saddr:(.*?)\s/i", $sTempString, $aMatch);

print $aMatch[1]; //

Notes: We know that even number end with 0, 2, 4, 6, 8 and odd numbers ends with 1, 3, 5, 7, 9. So how will we know if a number given is an even or odd number in a program..

Solution:

<?

$magic_number = 123568;

if($magic_number % 2 == 0) {

    print "The number is even.";

}  else {

    print "The number is odd.";

}

?>

Explanation: In the program above we use the modulus division. Modulus division unlike the ordinary division (/) returns the remainder instead of the quotient. So we tried modulo dividing the given number by 2 to determine if it is divisible by 2.

$x = 10;

$y = 20;

The usual way of exchanging their variables is to use a temporary variable like the one below

$x = 10;

$y = 20;

$z = $x; // $z will be equal to 10 now which will serve as a temporary variable

$x = y; // $x will be equal to 20 now

$y = $z; // $y will be 10 now

Their is another way to do this without using temporary variable is the use of list() function

$x = 10;

$y = 20; 

list($x, $y) = array($y, $x);

You can also do this in multiple variables

$sDog1 = "Boston Terrier";

$sDog2 = "American Bulldog";

$sDog3 = "German Shepperd";

$sDog4 = "Great Dane";

list($sDog1, $sDog2, $sDog3, $sDog4) = array($sDog3, $sDog1, $sDog4, $sDog2); 

$sMyName = “Darwin”;

print $sMyName[1]; // will print the letter “a”

Heredocs start with <<< and a token or also known as delimiting identifier. The token or delimiting identifier don’t leading or trailing whitespace and followed by semicolon a to end the statement.

Example: We wanted to print this string

The quick brown fox

jumps over the lazy dog.

But what is the name of that dog 

whom the fox jumped over.

Usually we will use the print built in function of php and put line breaks to separate the lines

print "The quick brown fox \n";

print "jumps over the lazy dog. \n";

print "But what is the name of that dog \n"; 

print "whom the fox jumped over \n";

In heredoc we literally print these sequence string without having to print all the lines 1 by 1;

Using heredoc

print <<< DOGS

The quick brown fox

jumps over the lazy dog.

But what is the name of that dog 

whom the fox jumped over.

DOGS; 

Heredocs in HTML

$sAnimal = "cat";

$aZoo = array("elephant","zebra","monkey","lion","bear");

print <<< ZOO

There are different animals in the zoo.

It includes <b>$aZoo[1], $aZoo[3].</b>

There are also <font color="red">$sAnimal</font> here.

ZOO;

Comments – - comments are piece of information that programmers usually put to their code to explain what it does. Comments are not actually part of the execution of a program but instead they are ignored by the PHP interpreter. It is a good practice in a programmer to put comments on his code because in the future, comments are the only guide a programmer can follow to understand a big pile of code. Comments may vary depending on what type comment to put.

1. single line comments – for single line commenting I use the double forward slash //

Example:

// this line will print your name

print "My name is Juan dela Cruz";

2. multi-line comment – for multi line I use /* and the closing */

Example:

/*

This is a multi-line comment

and goes all the way

up to this point

*/

Variables

for variables I use the camelize form. Meaning letters in my variable have combination of upper and lower case. But in addition I am affixing a single letter prefix that will determine the datatype of that variable. For example, if I would declare an array variable I would write $aMyArray.

Example:

$aMyArray = array(1,2,3,4); // contains array values

$sYourName = "Conai"; // contains string values

$iLoop = 100; // contains integer values

$oDBConnection = mysql_connect("localhost", "username", "password"); // object

$bIsTrue = false;  // boolean

$mMixedVariable = "test"; // mixed variable, a variable that may vary in datatype

For single usage or single letter variable there is an exemption on my rule.

for ($x=1; $x<count($aMyArray); $x++) {

    <statement here>

}

in the above example $x dont have any prefix on what datatype it is. I have sited this as my exemption.

Constants

as a rule constants should all be in uppercase and words separated by underscore(_)

Example:

define('HOST',  'localhost');

define('USER_NAME', 'root');

define('PASSWORD', '1234567a');

Conditional Statements

if statement

if ($x == 1) {

    <statement here after 4 solid spaces>

}

if – else statement

if ($x == null || $y != false) {

    <statement of if after 4 solid spaces>

} else {

    <statement of else after 4 solid spaces>

}

if -else if – else

if ($x > count($aResults)) {

    <statement of if after 4 solid spaces>

} else if ($x < count($aResults)) {

    <statement of else fif after 4 solid spaces>

} else {

    <statement of else after 4 solid spaces>

}

Loop statement

for loop

for($iCounter=0; $iCounter<10; $iCounter++) {

    <statement of for loop after 4 solid spaces>

}

while

while( !feof($oHandle) ) {

    <statement of while loop after 4 solid spaces>

}

do-while

do {

    <statement after 4 solid spaces>

}  while( $iLoop > 10) ;

Functions - function names are the same as the camelize form of my variables. Function names usually starts with small letters.

Example:

function checkThisVariable($mVariable) {

     if( is_integer($mVariable) ) {

        return "integer";
    } else if ( is_array($mVariable) ) {

        return "array";

    } else {

         return "undetermine";

    }

}

Class - class name are also in camelize form but the first letter is Capitalize to signify that it is a class when placed among other variables.

Example:

class Cabinet {

    var $sDrawer;

    function Cabinet () {

        $this->sDrawer = true;

    }
}