PHP addition increment operation method 1+2+3+4+5 ..... ......

<?php//while Loop statement

/*

1+2=3

3+3=6

6+4=10

10+5=15

15+6=21

21+7=28

28+8=36

36+9=45

45+10=55

......

*/

$a =1;//Results

$c Number of =2;//cycles

while ($c <=10) {

$b = $c; Assign the value of C to B

$a = $a + $b;//implement A+b result assignment to a a=3

$c ++;//variable c plus 1, the original 2 becomes 3.

echo "$a"; Output A in loop

echo "<br>";

}

echo "$a"; Last Output a

?>

The following Do....while loop statements

<?php

$a = 1; variable, the result of adding

$b =2;//summand Variable

do {

$a = $a + $b; The result of A+b is assigned to a

$b + +; B plus 1

echo "$a"; Outputs the value of the result variable a once per loop

echo "<br>";//newline Displays the value of each loop output

} while ($b <=100); Condition is false exit loop

echo "$a";//if the output here shows a result

?>

This article is from the "Lu Weizing blog" blog, make sure to keep this source http://ycluwq.blog.51cto.com/7588370/1582914

PHP addition increment operation method 1+2+3+4+5 ..... ......