в 10:37, 26 мая 2010

2010-05-26T10:37:28Z

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2010-05-26T07:03:06Z

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==Add an Integer value==



<source lang="html4strict">
<?
$origVar = 100;
$origVar += 25;
echo "<P>Added a value, now it"s $origVar</P>";
?>

</source>

==Add a PHP block and create a variable that holds an integer==



<source lang="html4strict">
<?
# create a variable that holds an integer
$intVar = "9554215464";
echo "<P>integer: $intVar</P>";
?>

</source>

==Addendum: finding the largest integer==



<source lang="html4strict">
<?
function maxint(){
$to_test = 2;
while(1){
$last = $to_test;
$to_test = 2 * $to_test;
if (($to_test < $last) || (!is_int($to_test))){
return($last + ($last - 1));
}
}
}
$maxint = maxint();
print("Maxint is $maxint<BR>");
?>

</source>

==Adding two integers together==



<source lang="html4strict">

<?php
$var1 = 5;
$var2 = 2;
$answer = $var1 + $var2;
print "$var1 plus $var2 equals $answer.";
?>

</source>

==Add the two integer values and print the result.==



<source lang="html4strict">

<?
$a = 85;
$b = 24;
echo "<P>Original value of \$a is $a and \$b is
$b</P>";
$c = $a + $b;
echo "<P>Added \$a and \$b and got $c</P>";
?>

</source>

==++$answer and $answer++==



<source lang="html4strict">

<?php
$answer = 5;
echo (++$answer)." ";
echo "$answer<BR>";
$answer = 5;
echo ($answer++)." ":
echo $answer;
?>

</source>

==Assign an integer value this way==



<source lang="html4strict">

<?php
$myint = 10;
echo $myint . "<br />";
echo (int) $myint . "<br />";
$myint = 10 / 3;
echo (int) $myint . "<br />";
?>

</source>

==Calculating a date interval with epoch timestamps==



<source lang="html4strict">

<?php
$birthday = 163727100;
$gestation = 36 * 7 * 86400; // 36 weeks
$whoopee_made = $birthday - $gestation;
?>

</source>

==Calculating Discount==



<source lang="html4strict">

<HTML>
<BODY>
<H1><CENTER>Calculating Discount</CENTER></H1>
<?php
$price = 200;
$qty = 10;
echo "<H4>Original price is $price</H4>";
if ($qty =10) {
$discount=10;
}elseif ($qty <=20) {
$discount=15;
}elseif (qty <=30) {
$discount=20;
}elseif($qty <=40){
$discount=25;
}
echo "<H4>Discount is $discount percent</H4>";
echo "<H4>Price after discount is ", (($price * (100 - $discount)/ 100)), "</H4>";
?>
</BODY>
</HTML>

</source>

==Divide the two values and print the result==



<source lang="html4strict">
<?
$a = 85;
$b = 24;
echo "<P>Original value of \$a is $a and \$b is
$b</P>";
$c = $a / $b;
echo "<P>Divided \$a by \$b and got $c</P>";
?>

</source>

==Integer calculation==



<source lang="html4strict">

$i = 1; $j = 2;
print "$i $j";
$i++; $j *= 2;
print "$i $j";
$i++; $j *= 2;
print "$i $j";
$i++; $j *= 2;
print "$i $j";
$i++; $j *= 2;
print "$i $j";

</source>

==Integers can be specified using any of the following syntaxes==



<source lang="html4strict">

<?
$a = 1234; # decimal number
$a = -123; # a negative number
$a = 0123; # octal number (equivalent to 83 decimal)
$a = 0x12; # hexadecimal number (equivalent to 18 decimal)
?>

</source>

==Integer value compare with equal sign==



<source lang="html4strict">
<?
$a=100;
$b=true;
echo "a = $a<br>";
echo "b = $b<br>";
if($a==$b)
echo "a "is equal to" b!"; ?>

</source>

==Integer values can be signed and unsigned in the range from �2,147,483,648 to 2,147,483,647.==



<source lang="html4strict">

<?php
$i = 0x7FFFFFFF;
echo "$i is " . (is_int($i) ? "an integer" : "a float") . "\n";
$i++;
echo "$i is " . (is_int($i) ? "an integer" : "a float") . "\n";
?>

</source>

==Int value overflow==



<source lang="html4strict">

<?
$too_big = 111;
for ($count = 0; $count < 5; $count++) {
$too_big = 1000 * $too_big;
print("Is $too_big still an integer?<BR>");
}
?>

</source>

==Multiply the two values and print the result==



<source lang="html4strict">
<?
$a = 85;
$b = 24;
echo "<P>Original value of \$a is $a and \$b is
$b</P>";

$c = $a * $b;
echo "<P>Multiplied \$a and \$b and got $c</P>";

?>

</source>

==Storing Integers in PHP==



<source lang="html4strict">

<?php
$my_int = 50; /* Standard Decimal Notation */
$my_int = O62; /* Same number, Octal Notation (starts with the letter O)*/
$my_int = 0x32; /* Hexadecimal Notation */
?>

</source>

==Subtracted an Integer value==



<source lang="html4strict">
<?
$origVar = 100;
$origVar -= 12;
echo "<P>Subtracted a value, now it"s $origVar</P>";
?>

</source>

==Subtract the two values and print the result==



<source lang="html4strict">

<?
$a = 85;
$b = 24;
echo "<P>Original value of \$a is $a and \$b is
$b</P>";
$c = $a - $b;
echo "<P>Subtracted \$b from \$a and got $c</P>";

?>

</source>

==To specify a number in hexadecimal, precede it with 0x.==



<source lang="html4strict">

//To assign the number 68, you would use this:
$hexnum = 0x44;
print $hexnum;

</source>

==Using typecasting to convert numbers to strings==



<source lang="html4strict">

<?php
$i = 123456;
$f = 98765.567;

echo "\$i = " . (string)$i . "\n";
echo "\$f = " . (string)$f . "\n";
?>

</source>

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в 10:37, 26 мая 2010

Admin: 1 версия