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2010-05-26T10:37:28Z

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==A Function That Returns a Value==



<source lang="html4strict">

<html>
<head>
<title>A Function That Returns a Value</title>
</head>
<body>
<div>
<?php
function addNums( $firstnum, $secondnum ) {
$result = $firstnum + $secondnum;
return $result;
}
print addNums(3,5);
?>
</div>
</body>
</html>

</source>

==Function Requiring Two Arguments==



<source lang="html4strict">
<html>
<head>
<title>Function Requiring Two Arguments</title>
</head>
<body>
<?php
function fontWrap( $txt, $size ) {
print "$txt";
}
fontWrap("call 1 ",5);
fontWrap("call 2 ",3);
fontWrap("call 3 ",3);
fontWrap("call 4 ",3);
?>
</body>
</html>

</source>

==Function return more than one value==



<source lang="html4strict">
<?php
function retrieve_user_profile() {
$user[] = "A";
$user[] = "A@example.ru";
$user[] = "English";
return $user;
}
list($name,$email,$language) = retrieve_user_profile();
echo "Name: $name, email: $email, preferred language: $language";
?>

</source>

==Functions that return true or false==



<source lang="html4strict">

<?
function can_pay_cash($cash_on_hand, $amount) {
if ($amount > $cash_on_hand) {
return false;
} else {
return true;
}
}
function myFunction($meal, $tax, $tip) {
$tax_amount = $meal * ($tax / 100);
$tip_amount = $meal * ($tip / 100);
$total_notip = $meal + $tax_amount;
$total_tip = $meal + $tax_amount + $tip_amount;
return array($total_notip, $total_tip);
}
$total = myFunction(15.22,8.25,15);
if (can_pay_cash(20, $total)) {
print "I can pay in cash.";
} else {
print "Time for the credit card.";
}
?>

</source>

==Math Function Library==



<source lang="html4strict">

<?php
function subtract($n1, $n2) {
return $n1 - $n2;
}

function add($n1, $n2) {
return $n1 + $n2;
}

function divide($n1, $n2) {
if($n2 == 0)
return -1;
else
return $n1 / $n2;
}

function multiply($n1, $n2)
{
return $n1 * $n2;
}

function to_pow($n1, $pow)
{
if($pow)
return $n1 * to_pow($n1, $pow - 1);
return 1;
}
print(to_pow(6, 1) . " ");
print(multiply(5, 10) . " ");
print(divide(5, 10) . " ");
print(subtract(10, 50) . " ");
print(add(10, 5) . " ");
?>
</body>
</html>

</source>

==Multiple return statements in a function==



<source lang="html4strict">

<?
function payment_method($cash_on_hand, $amount) {
if ($amount > $cash_on_hand) {
return "credit card";
} else {
return "cash";
}
}
?>

</source>

==Passing Arguments and Returning Values by Reference==



<source lang="html4strict">

<?php
function add2(&$number) {
$number += 2;
return $number;
}
$mynum = 5;
$output = add2($mynum);
$output++;
echo "output = {$output}, mynum = {$mynum}\n";
function &initialize() {
$new = array_fill(0, 10, array_fill(0, 10, 0));
return $new;
}
$newarray =& initialize();
echo print_r($newarray, true);
?>

</source>

==Returning a list an array from function==



<source lang="html4strict">

<?
function small_numbers() {
return array (0, 1, 2);
}
list ($zero, $one, $two) = small_numbers();
?>

</source>

==Returning an array from a function==



<source lang="html4strict">

<?
function myFunction2($meal, $tax, $tip) {
$tax_amount = $meal * ($tax / 100);
$tip_amount = $meal * ($tip / 100);
$total_notip = $meal + $tax_amount;
$total_tip = $meal + $tax_amount + $tip_amount;
return array($total_notip, $total_tip);
}
?>

</source>

==Returning a Value by Reference==



<source lang="html4strict">

<?php
function &find_var($one, $two, $three) {
if(($one > 0) && ($one <= 10)) return $one;
if(($two > 0) && ($two <= 10)) return $two;
if(($three > 0) && ($three <= 10)) return $three;
}
$c_one = "foo";
$c_two = 42;
$c_three = 4;
$right_var = &find_var($c_one, $c_two, $c_three);
$right_var++;
echo "The value of \$c_three and \$right_var are: ";
echo "$c_three and $right_var \n";
?>

</source>

==Returning a value from a function==



<source lang="html4strict">

<?
$number_to_display = number_format(285266237);
print "The population of the US is about: $number_to_display";
function myFunction($meal, $tax, $tip) {
$tax_amount = $meal * ($tax / 100);
$tip_amount = $meal * ($tip / 100);
$total_amount = $meal + $tax_amount + $tip_amount;
return $total_amount;
}
?>

</source>

==Returning by Reference==



<source lang="html4strict">

function &return_fish( ) {
$fish = "Wanda";
return $fish;
}
$fish_ref =& return_fish( );

</source>

==Returning More Than One Value==



<source lang="html4strict">

<?php
function addandsubtract ($firstvalue, $secondvalue){
$firstreturnvalue = ($firstvalue + $secondvalue);
$secondreturnvalue = ($firstvalue - $secondvalue);
$myarray = array ();
$myarray[0] = $firstreturnvalue;
$myarray[1] = $secondreturnvalue;
return $myarray;
}
$myarray = array ();
$myarray = addandsubtract (10, 3);
echo $myarray[0] . " ";
echo $myarray[1];
?>

</source>

==Returning Values by Reference==



<source lang="html4strict">

<?php
class myclass {
private $thevalue;
private $theword;
public function __construct (){
$num_args = func_num_args();
if($num_args > 0){
$args = func_get_args();
$this->theword = $args[0];
}
}

public function setvalue ($newvalue){
$this->thevalue = $newvalue;
}
public function getvalue () {
return $this->thevalue;
}
public function getword () {
return $this->theword;
}
}
$myclass1 = new myclass ("A");
$myclass1->setvalue (1);

$myclass2 = new myclass ("B");
$myclass2->setvalue (2);

$myclass3 = new myclass ("C");
$myclass3->setvalue (3);

$myclass4 = new myclass ("D");
$myclass4->setvalue (4);

$classarr = array ($myclass1,$myclass2,$myclass3,$myclass4);
function &findclass ($whichclass,$classarr){
for ($i = 0; $i < count ($classarr); $i++){
if ($classarr[$i]->getvalue() == $whichclass){
return $classarr[$i];
}
}
}
$myobject = new myclass ("");
$myobject =& findclass (3,$classarr);
echo $myobject->getword();
?>

</source>

==return multiple values from a function==



<source lang="html4strict">

<?php
function retrieve_user_profile() {
$user[] = "Jason";
$user[] = "jason@example.ru";
$user[] = "English";
return $user;
}
list($name,$email,$language) = retrieve_user_profile();
echo "Name: $name, email: $email, preferred language: $language";
?>

</source>

==User-Defined Function to Determine a Leap Year==



<source lang="html4strict">

<?php
function is_leapyear($year = 2004) {
$is_leap = (!($year % 4) && (($year % 100) || !($year % 400)));
return $is_leap;
}
$answer = is_leapyear(2000);
if($answer) {
echo "2000 is a leap year ";
} else {
echo "2000 is not a leap year. ";
}
$answer = is_leapyear();
if($answer) {
echo "2003 is a leap year. ";
} else {
echo "2003 is not a leap year. ";
}
?>

</source>

==Using an array returned from a function==



<source lang="html4strict">

<?
function myFunction2($meal, $tax, $tip) {
$tax_amount = $meal * ($tax / 100);
$tip_amount = $meal * ($tip / 100);
$total_notip = $meal + $tax_amount;
$total_tip = $meal + $tax_amount + $tip_amount;
return array($total_notip, $total_tip);
}
$totals = myFunction2(15.22, 8.25, 15);
if ($totals[0] < 20) {
print "The total without tip is less than $20.";
}
if ($totals[1] < 20) {
print "The total with tip is less than $20.";
}
?>

</source>

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в 10:37, 26 мая 2010

Admin: 1 версия