PHP/Data Type/Integer
Содержание
- 1 Add an Integer value
- 2 Add a PHP block and create a variable that holds an integer
- 3 Addendum: finding the largest integer
- 4 Adding two integers together
- 5 Add the two integer values and print the result.
- 6 ++$answer and $answer++
- 7 Assign an integer value this way
- 8 Calculating a date interval with epoch timestamps
- 9 Calculating Discount
- 10 Calculating Discount
- 10.1 Original price is $price
- 10.2 Discount is $discount percent
- 10.3 Price after discount is ", (($price * (100 - $discount)/ 100)), "
- 10.4 Divide the two values and print the result
- 10.5 Integer calculation
- 10.6 Integers can be specified using any of the following syntaxes
- 10.7 Integer value compare with equal sign
- 10.8 Integer values can be signed and unsigned in the range from �2,147,483,648 to 2,147,483,647.
- 10.9 Int value overflow
- 10.10 Multiply the two values and print the result
- 10.11 Storing Integers in PHP
- 10.12 Subtracted an Integer value
- 10.13 Subtract the two values and print the result
- 10.14 To specify a number in hexadecimal, precede it with 0x.
- 10.15 Using typecasting to convert numbers to strings
Add an Integer value
<source lang="html4strict">
<? $origVar = 100; $origVar += 25;
echo "Added a value, now it"s $origVar
";?>
</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 "integer: $intVar
";?>
</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
");
?>
</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 "Original value of \$a is $a and \$b is $b
";$c = $a + $b;
echo "Added \$a and \$b and got $c
";?>
</source>
++$answer and $answer++
<source lang="html4strict">
<?php
$answer = 5; echo (++$answer)." "; echo "$answer
"; $answer = 5; echo ($answer++)." ": echo $answer;
?>
</source>
Assign an integer value this way
<source lang="html4strict">
<?php
$myint = 10;
echo $myint . "
";
echo (int) $myint . "
";
$myint = 10 / 3;
echo (int) $myint . "
";
?>
</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>
Calculating Discount
<?php
$price = 200; $qty = 10;echo "
Original price is $price
"; if ($qty =10) {
$discount=10;
}elseif ($qty <=20) {
$discount=15;
}elseif (qty <=30) {
$discount=20;
}elseif($qty <=40){
$discount=25;
}
echo "Discount is $discount percent
"; echo "Price after discount is ", (($price * (100 - $discount)/ 100)), "
";?> </BODY> </HTML>
</source>
Divide the two values and print the result
<source lang="html4strict">
<? $a = 85; $b = 24;
echo "Original value of \$a is $a and \$b is $b
";$c = $a / $b;
echo "Divided \$a by \$b and got $c
";?>
</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
";
echo "b = $b
";
if($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?
");
} ?>
</source>
Multiply the two values and print the result
<source lang="html4strict">
<? $a = 85; $b = 24;
echo "Original value of \$a is $a and \$b is $b
";$c = $a * $b;
echo "Multiplied \$a and \$b and got $c
";?>
</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 "Subtracted a value, now it"s $origVar
";?>
</source>
Subtract the two values and print the result
<source lang="html4strict">
<? $a = 85; $b = 24;
echo "Original value of \$a is $a and \$b is $b
";$c = $a - $b;
echo "Subtracted \$b from \$a and got $c
";?>
</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>
