Results: 1580
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A variable can have a short name (like x and y) or a more descriptive name (age, carname, total_volume).
Rules for PHP variables:
A variable starts with the $ sign, followed by the name of the variable
A variable name must start with a letter or the underscore character
A variable name cannot start with a number
A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
Variable names are case-sensitive ($age and $AGE are two different variables)
Remember that PHP variable names are case-sensitive!
by Tinatin Kvinikadze
2 years ago
0
PHP has a total of eight data types that we use to construct our variables:
Integers: are whole numbers, without a decimal point, like 4195.
Doubles: are floating-point numbers, like 3.14159 or 49.1.
Booleans: have only two possible values either true or false.
NULL: is a special type that only has one value: NULL.
Strings: are sequences of characters, like 'PHP supports string operations.'
Arrays: are named and indexed collections of other values.
Objects: are instances of programmer-defined classes, which can package up both other kinds of values and functions that are specific to the class.
Resources: are special variables that hold references to resources external to PHP (such as database connections).
by Tinatin Kvinikadze
2 years ago
0
In PHP, keywords (e.g. if, else, while, echo, etc.), classes, functions, and user-defined functions are not case-sensitive.
In the example below, all three echo statements below are equal and legal:
<!DOCTYPE html>
<html>
<body>
<?php
ECHO "Hello World!<br>";
echo "Hello World!<br>";
EcHo "Hello World!<br>";
?>
</body>
</html> by Tinatin Kvinikadze
2 years ago
0
A variable declared outside a function has a GLOBAL SCOPE and can only be accessed outside a function.
A variable declared within a function has a LOCAL SCOPE and can only be accessed within that function:
<?php
$name='GURAM';//Global variable
function local_var() {
$name='guram'; //local variable
echo 'Local variable: '.$name ."\n";
}
local_var();
echo 'Global variable: '.$name;
?><?php
function myTest() {
static $x = 0;
echo $x;
$x++;
}
myTest();
myTest();
myTest();
?> by Guram Azarashvili
2 years ago
0
<!DOCTYPE html>
<html>
<body>
<?php
$students_inf = array(
array(
"Name" => 'Luka',
"Age" => 21,
"E-mail" => 'Luka.N111@gmail.com',
"Status" => 'Registered'
),
array(
"Name" => 'Nini',
"Age" => 20,
"E-mail" => 'Nini.K312@gmail.com',
"Status" => 'Unregistered'
),
array(
"Name" => 'Giorgi',
"Age" => 22,
"E-mail" => 'Giorgi.ES8@gmail.com',
"Status" => "Registered"
)
);
//You can get students information with echo and var_dump.
var_dump(json_encode($students_inf));
echo str_repeat("<br />",5);
echo $students_inf[0]['Name']. "<br />";
echo $students_inf[0]['Age']. "<br />";
echo $students_inf[1]['Status']. "<br />";
echo $students_inf[2]['E-mail']. "<br />";
?>
</body>
</html> by ნუგო ყველაშვილი
2 years ago
0
PHP automatically associates a data type to the variable, depending on its value. Since the data types are not set in a strict sense, you can do things like adding a string to an integer without causing an error.
In PHP 7, type declarations were added. This gives us an option to specify the expected data type when declaring a function, and by adding the strict declaration, it will throw a "Fatal Error" if the data type mismatches.
<?php declare(strict_types=1); // strict requirement
function addNumbers(int $a, int $b) {
return $a + $b;
}
echo addNumbers(5, "5 days");
// since strict is enabled and "5 days" is not an integer, an error will be thrown
?> by Guram Azarashvili
2 years ago
0
const a = 10 + '20'; // the sum of integer and string values
const b = '20' + '20'; // the sum of two string values
console.log(a, b); // returns "1020" , "2020"
console.log(typeof(a, b)); // both are strings$a = 10 + '20'; // The sum of an integer and a string
$b = '1020' + '20'; // The sum two strings
echo $a, "\n ", $b, "<br>"; // returns 30, 1040
echo var_dump($a, $b); // both are integers (int+str) (str+str)$integer = 10;
$stringIncrement = '20';
$result = $integer + $stringIncrement;
$result = (string) $result;
var_dump($result); by Luka Khitaridze
2 years ago
0
/* The main difference between both loops is that while loop checks the condition at the beginning, whereas do-while loop checks the condition at the end of the loop */
// make the while loop example
$i = 1;
while ($i < 5) {
echo "the result is $i", "\n";
$i++;
}
// please note, If the condition never becomes false, the statement will continue to execute indefinitely.// make the do...while loop
$i = 1;
do {
echo "hello world";
}
while ($i < 0);
// is that case will return the result? by Luka Khitaridze
2 years ago
0
Results: 1580