Basic for Function on PHP

Function:
       Function are a set of bloch, which are defined for calling a set of code again and again.
There are two way to calling a function in PHP:

• Directly calling a Function.
• Function called by a object of a class and defined within a class. 

They are Important as some of the code, we have to use different location on a site. So a good way is to define in a File i.e. "functions.php" and include it to top of the position.

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PHP Code

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Program 01:      Normal Function just running the code within it

<?php
//  Normal Function just running the code within it
//  function definition
function callme($a,$b)
{
// echo "<br/>Sum of the ".$a." and ".$b. "is = ".$a+$b;
echo "<br/>Sum of the ".$a." and ".$b. "is = ".($a+$b);
echo "<br/>Multi of the ".$a." and ".$b. "is = ".$a*$b;
echo "<br/>Min of the ".$a." and ".$b. "is = ".$a-$b;
echo "<br/>Divide of the ".$a." and ".$b. "is = ".$a/$b;
echo "<br/>Modulus of the ".$a." and ".$b. "is = ".$a%$b;
}
// function defination

// function call
callme(2,5);
// function call

?>

Program 02:  Function definition with returning some value
<?php
// function definition with returning some value
function sum($a,$b)
{
    $sum = $a + $b;
return $sum;
}
function minus($a,$b)
{
    $minus = $a - $b;
return $minus;
}
// function defination with returning some value

// use of return function as a variable
echo "Sum of 2 and 3 is : ".sum(2,3);
// use of return function as a variable


// function definition with returning some value

?>

Program 03: Function definition with returning array value
<?php
function callmeforarray($a,$b)
{
$addition  = $a + $b;
$minus  = $a - $b;
$multiplication = $a * $b;
$division  = $a / $b;
$modulus  = $a % $b;

$returnvalue['sum'] = $addition."<br/>";
$returnvalue['min'] = $minus."<br/>";
$returnvalue['mul'] = $multiplication."<br/>";
$returnvalue['div'] = $division."<br/>";
$returnvalue['mod'] = $modulus."<br/>";

return $returnvalue;
}

echo "<hr/>";

$result = callmeforarray(30,5);

 echo "Sum is : ". $result['sum'];
 echo "Min is : ". $result['min'];
 echo "mul is : ". $result['mul'];
 echo "div is : ". $result['div'];
 echo "mod is : ". $result['mod'];

 $result = callmeforarray(34,2);

 echo "Sum is : ". $result['sum'];
 echo "Min is : ". $result['min'];
 echo "mul is : ". $result['mul'];
 echo "div is : ". $result['div'];
 echo "mod is : ". $result['mod'];

 echo "<hr/>";

?>

Program 04: Function definition within in a class
<?php
// function definition within in a class
class common
{

function addition($a,$b)
{
echo "<br/> Sum of the " . $a . " and  " . $b . " is : " . ( $a + $b ) ;
}
function multiplication($a,$b)
{
echo "<br/> Multiplication of the " . $a . " and  " . $b . " is : " . ( $a * $b ) ;
}

}
// function defination within in a class

// object creation for class
$com1 = new common();
// object creation for class

// function call via class's object
$com1->addition(2,3);
$com1->multiplication(2,3);
// function call via class's object

?>

Program 05:  Function call of a another class
<?php

// function call of a another class
class class1
{

function function1()
{
return 123;
}

function function2()
{
return 259;
}

}

class class2
{

function function1()
{
$object = new class1(); 

echo $object->function1()+$object->function2();
}

}

$obj = new class2();

$obj->function1();

// function call of a another class

echo "<hr/>";

echo "Above Exapmle Basic : " . (123+259);

echo "<hr/>";


?>

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Output of the Code

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Program 01:

Sum of the 2 and 5is = 7
Multi of the 2 and 5is = 10-5
Divide of the 2 and 5is = 0.4
Modulus of the 2 and 5is = 2

Program 02:

Sum of 2 and 3 is : 5

Program 03:

Sum is : 35
Min is : 25
mul is : 150
div is : 6
mod is : 0
Sum is : 36
Min is : 32
mul is : 68
div is : 17
mod is : 0

Program 04: 

Sum of the 2 and 3 is : 5
Multiplication of the 2 and 3 is : 6

Program 05:  

382

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Above Example Basic : 382