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PHP Tutorial :: Numbers

PHP Example #12

Numbers

Numbers in PHP are expressed through a common notation; a point is used to separate decimals in float numbers and a negative sign can be written before the numbers to make them negative. Here are some examples:

<?php
print 56;
print nl2br("\n");
print 56.3;
print nl2br("\n");
print 0.774422;
print nl2br("\n");
print 16777.216;
print nl2br("\n");
print 0;
print nl2br("\n");
print -213;
print nl2br("\n");
print 1298317;
print nl2br("\n");
print -9912122;
print nl2br("\n");
print -12.52222;
print nl2br("\n");
print 0.00;
?>
56
56.3
0.774422
16777.216
0
-213
1298317
-9912122
-12.52222
0

PHP Example #13

Mathematical operations

Apart from the common operators, sum (+), rest (-), multiplication (*) and division (/), PHP also includes an operator for modulus (%).

In PHP the operators have their priorities set as in the world of maths in general; for example, multiplication is prioritaire over sum. So the expression 3 + 4 * 2 would give as result 11 and no 14. But you can use parenteses to specify your own rules of precedency. So, the expression (3 + 4) * 2 would indeed give as result 14.

<?php
print 2 + 2;
print nl2br("\n");
print 17 - 3.5;
print nl2br("\n");
print 10 / 3;
print nl2br("\n");
print 6 * 9;
print nl2br("\n");
print 17 % 3;
?>
4
13.5
3.3333333333333
54
2