PHP Programming

Rasmus Lerdorf released PHP publicly on June 8, 1995 to accelerate bug location and improve the code. This release was named PHP version 2 and already had the basic functionality that PHP has today.

Most CGI scripts are used for websites, thus CGI experts would be named website programmers. If they use CGI scripting for other purposes, however, another title may be more ideal.

The print function is slightly more dynamic than the echo function by returning a value, and the echo function is slightly (very slightly) faster. The printf function inserts dynamic variables/whatever into wherever you want with special delimiters, such as %s, or %d. For example, printf('There is a difference between %s and %s', 'good', 'evil') would return 'There is a difference between good and evil'.

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$array_size = 250;

// If you use v4.2.0 or lower uncomment this

// srand((double)microtime()*1000000);

// Generate $array_size random numbers to be sorted.

for($x = 0; $x < $array_size; $x++)

$ran[$x] = rand(0, 500);

/* The bubble sort method. If you don't know how it works it's very

* simple, values are switched one at a time for each element. */

for($x = 0; $x < $array_size; $x++) {

for($y = 0; $y < $array_size; $y++) {

if($ran[$x] < $ran[$y]) {

$hold = $ran[$x];

$ran[$x] = $ran[$y];

$ran[$y] = $hold;

}

}

}

for($x = 0; $x < $array_size; $x++)

print $ran[$x] . "<br>";

The following PHP function is an example of how you could achieve this: You would then call the function as follows: where *MARK* is the mark I hope this has helped, Cpl.Vadera

It is an Methamphetamine drug.

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Use the "static" keyword to declare a static variable within a function like shown below.

<?php

function fun() {

static $variable;

static $another_variable = '';

}

?>

You can unset a variable in PHP by setting it to NULL. You can set a variable to NULL by declaring it normally, or using the function "unset()". Both methods are acceptable, and accomplish the same thing. Examples of both: ---- $variable = NULL; ---- unset($variable); ----

MD stands for Message Digest algorithm.

The possibility of legacy ground-breaking. It permits you to make another class that reuses the properties and strategies from a current class. A class that acquires from another class is called subclass (likewise a kid class or an inferred class). The class from which the subclass acquires is known as parent class (likewise a superclass or a based class). Other than acquiring properties and techniques from the parent class, a subclass class can have extra properties and strategies.

Legacy is exceptionally helpful on the off chance that you need to make a few comparative classes. You put the normal properties and strategies in the parent class and explicit properties and techniques in the youngster classes. This encourages you maintain a strategic distance from copy code that actualizes similar properties and strategy in numerous classes.

PHP legacy model

In the PHP articles and classes instructional exercise, we made a ledger ( BankAccount) class. We can expand the financial balance class by making other ledger classes e.g., sparing record class and financial records class that reuse the properties and strategies for the BankAccount class:

Sparing record : is an ordinary financial balance and acquires month to month intrigue.

Financial records: is an ordinary ledger, acquires no intrigue and has expense deducted month to month.

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In the beginning, it was called PHP/FI for "Personal Home Page / Forms Interpreter". Then when the project got bigger it was renamed into the form "PHP: Hypertext Preprocessor", a recursive acronym.

There are more than 200 common uses of the abbreviation MP. This abbreviation is used to mean military police, media player, Ministerio Publico, Member of Parliament, and melting point.

The "require()" and "include()" variables both bring in a called, parsed page into the calling page the functions are in. The only difference between the two is how they handle errors. Advantages would include better organization. Using these functions, it is very easy to organize a website - by being able to edit one page, and dynamicly edit many other pages at the same time. The functions are quick and easy, assuming the server isn't very busy and can handle well-sized loads. Disadvantages would include how these functions are bandwidth eaters - parsing multiple pages hurts bandwidth (but alternatives could be worse); not to mention the server processing speed. Multiple requests for one page can add up. As for the "require_once()" and "include_once()" variables, advantages would include a page only being called once - for sure. Disadvantages include errors on trying to include that same page again.

<?php

for($i=1; $i<=1000; $i++)

{

$num=$i;

$sum=0;

while($num>=1)

{

$rem=$num%10;

$qub=$rem*$rem*$rem;

$sum=$sum+$qub;

$num=$num/10;

}

if($sum==$i)

{

echo("<br>$sum");

}

}

?>

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the dollar sign appears before a variable/array. Essentially it just tells php that its a variable.

$food = "cheese pizza";

or

$myfavoritenumber = 2 ;

Well their is a quite big difference between them. a mark-up language um i wouldn't call it a actual programming language, to basic. It deals mostly with the visual aspects interface of a website, where php deals with the side server aspects, which process information which control the processing of information and data accross your a website etc... so i guess the main difference is... mark-up language is used to show the visual interface of a website, php is for functionality. i don't consider mark up languages as a actual true programming language

simple code example: <? while ($a < 10 ) { echo "$a, "; $a++; } echo "Finished"; ?> Will output, 1, 2, 3, 4, 5, 6, 7, 8, 9, Finished this will run through the loop WHILE $a is less than 10, outputting the value of $a to the screen. once $a = 10 then the loop will end and continue on with the rest of the script

chdir() PHP function helps in changing the current directory.

echo or print < both of which write text: <?php echo "TEXT"; print "TEXT"; ?>

Print always returns a value of true, but echo doesn't.

echo also has a short cut syntax meaning you can immediately follow the php tags by an equals sign and it will echo the result like in the example shown below:

<?=$hello?>

To merge and sort an array in PHP you need to use the array_merge() and sort() functions like shown in the example below:

<?php

$array1 = array(1, 5, 3, 9, 7);

$array2 = array(8, 2, 6, 4, 0);

// merge the arrays

$merge = array_merge($array1, $array2); // 1, 5, 3, 9, 7, 8, 2, 6, 4, 0

// sort the array

sort($merge); // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

?>