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what is "\n" ? - Escape Sequences CODE
• 
\n
represents the newline (linefeed) 
echo "Co\nding\n";
// output:	    Co
//      	    ding
• 
\t
represents the tab 
echo "Co\tding\n";
// output:          Co	ding
by Levani Makhareishvili
3 years ago
0
PHP
Escape sequances
1
Array types CODE
➤ In PHP, you can use the array() construct or [] syntax to define an array. • Indexed array — An array with a numeric key ( index ). 
$arr = []; // or $arr = array();
$arr[0] = "Levani";
$arr[1] = "Nika";
$arr[2] = "Giorgi"; // or $arr = ["levani","Nika","Giorgi"]
$arr[] = "Saba"; // add last element in arr
echo "I am $arr[0] \n"; // output: I am Levani
• Associative array — An array where each key has its own specific value. In the following example the array uses keys instead of index numbers: 
$ages = [
	"John" => 15,
	"Michael" => 25,
	"Levani" => 19,
	"Mads" => 57
	];
//          or
// $ages["John"] = "15";
// $ages["Michael"] = "25";
// $ages["Levani"] = "19";
// $ages["Mads"] = "57";
echo "I am ".$ages["Levani"]." years old \n"; // output: I am 19 years old
• Multidimensional array — An array containing one or more arrays within itself. 
$laptop = [
	"Lenovo" => [
		"price" => 1200,
		"color" => "white",
		"storage" => "300 Gb",
		],
	"Dell" => [
		"price" => 1000,
		"color" => "black",
		"storage" => "500 Gb",
		],
	];
echo "My laptop price is ".$laptop["Dell"]["price"].".\n"; // output: My laptop price is 1000.
by Levani Makhareishvili
3 years ago
0
PHP
Arrays
1
If-else PHP CODE
Output "I watch TV" if the current time is less than 20, and "I play a game" otherwise: 
<?php
$t = date("H");
if ($t < "18") {
	echo "I watch TV";
} else {
	echo "I play a game";
}
?>
by Mariam Gelkhauri
3 years ago
0
PHP
Object Oriented PHP Tutorial
0
If Statement in PHP CODE
If the current day is Sunday the code will output "I don't worl." 
<?php
$d = date("D");
if ($d == "Sun"){
    echo "I don't work". ".";
} 
?>
If the current hour is less than 20, the code will output "I am going to sleep" 
<?php
$t = date("H");
if ($t < "22"){
	echo " I am going to sleep";
}
?>
by Mariam Gelkhauri
3 years ago
0
PHP
If Statement
PHP
Object Oriented PHP Tutorial
0
Variable types CODE
• String 
$str = "string"; // "hello" "Gamarjoba" 'levani' and so on.
• Integer 
$int_num = 10; // -12 400 9999 -123421 90 and so on.
• Float 
$float_num = 2.5; // -1.5 20.5 150.7 and so on.
• Boolean 
$human = true; // equals 1
$robot = false; // equals 0
• Array 
$laptops = array("Dell","Lenovo","Hp",1,2,3);
• constant Constants are similar to variables except that they cannot be changed or undefined after they've been defined. Begin the name of your constant with a letter or an underscore. To create a constant, use the define() function. (no $ sign before the constant name): • name: Specifies the name of the constant • value: Specifies the value of the constant • case-insensitive: Specifies whether the constant name should be case-insensitive. Default is false 
define(name, value, case-insensitive)
// define constant
define("PI",3.141592);
echo PI;
I will discuss additional data types later, in a new note!
by Levani Makhareishvili
3 years ago
0
PHP
variables
1
Differences between echo and print CODE
• 
echo
statement considered marginally faster than the 
print
statement since it doesn't return any value. • 
print
always returns an integer value, which is 1. 
$result = print 10;
echo $result; // output: 1
• Using 
print
, we cannot pass multiple arguments. 
print 10,20,30; // error
by Levani Makhareishvili
3 years ago
0
PHP
echo/print
1
PHP Class Inheritance
<?php interface AnimalInterface { public function makeSound(); } class Dog implements AnimalInterface { public function makeSound() { echo "Woof! <br />"; } } class Cat implements AnimalInterface { public function makeSound() { echo "Meow! <br />"; } } $myObj1 = new Dog(); $myObj1-> makeSound(); $myObj2 = new Cat(); $myObj2->makeSound(); ?>
by Gabriel Jakhveladze
3 years ago
0
PHP
Object Oriented PHP Tutorial
0
PHP echo and print Statements CODE
➤ PHP 
echo
statement can be used to print the string, multi-line strings, escaping characters, variable, array, etc. • printing string 
echo "Hello friends!\n";
• printing multi line string 
echo "How are you ?  
this is multi line  
text !\n";
• printing escaping characters 
echo "Hello \"Hello\" Hello\n";
• printing variable value ( only DOUBLE quetes can parse variables ) 
$num= 17;  
echo "num = $num\n";  
// or => echo "num = ".$num."\n";
// or => echo 'num = '.$num."\n";
• printing number without quotes 
echo 10;
• printing multiple parameters 
echo "red"," yellow"," black";
• echo can be used with or without parentheses: echo(), and echo. 
echo ("function\n");
• Text inside double quotes can include single quotes as part of the text. The opposite is also possible. 
echo "My name is 'Anton'\n";
echo 'My name is "Anton"';
➤ PHP 
print
statement works exactly the same way except that the print statement can only output one parameter, and always returns 1. • returns 1 
$result = print"Hello\n";
echo "result = $result"; // output: 1
• 
print
can take only one argument 
print "hello","world"; // error
by Levani Makhareishvili
3 years ago
0
PHP
echo/print
1
PHP Comments CODE
➤ A comment in PHP code is a line that is not executed as a part of the program. Its only purpose is to be read by someone who is looking at the code. • Let others understand your code. • Remind yourself of what you did. PHP supports several ways of commenting: 
// This is a single-line comment
# This is also a single-line comment
/*
This is a multiple-lines comment block
that spans over multiple
lines
*/
// You can also use comments to leave out parts of a code line
$a = 2 /* - 1 */ + 4;
by Levani Makhareishvili
3 years ago
0
PHP
Comments
1
Math Functions 
<?php 

  // Math functions

    # Function min() finds the lowest value from its arguments, example:
      echo min(21, 78, 20, 47, 89). "\n"; //outputs - 20;
    
    # Function max() finds the highest value from its arguments, example:
      echo max(78, 97, 109, 47, 445). "\n"; //outputs - 445;

    # Function count() counts all elements in the array, example: 
      echo count(67, 89, 76, 54, 9, 90). "\n"; //outputs - 6;

    # Function round() rounds a floating-point number to its nearest integer, example:
      echo(round(9.43)). "\n"; //outputs - 9;
      echo(round(5.5)). "\n"; //outputs - 6;

    # Function floor() rounds the floating-point number down, example:
      echo floor(9.7). "\n"; //outputs - 9;
      echo floor(6.1). "\n"; //outputs - 6;

    # Function ceil() rounds the floating-point number up, example: 
      echo ceil(9.8). "\n"; //outputs - 10;
      echo ceil(7.2). "\n"; //outputs - 8;

    # Function rand() generates a random number, example:
      echo rand(9, 88). "\n"; //outputs some number from 9 to 88;
    
    # Function sqrt() returns the square root of a number, example:
      echo sqrt(81). "\n"; //outputs - 9;

    # Function pow() raises 2 to the power of 3, example:
      echo pow(2, 3). "\n"; //output 8; 

    # Function pi() Returns PI value, example:
      echo pi(). "\n"; //outputs - 3.1415926535898

    # Function abs() returns the positive (absolute) value of a number, example:
      echo abs(-87). "\n"; //outputs - 87;

    # Function decbin() converts decimal number into binary, example: 
      echo decbin(44). "\n"; //outputs - 101100;

?>
by Mariam Gelkhauri
3 years ago
0
PHP
Math Functions
Object Oriented PHP Tutorial
1
Results: 1578