PHP goes on infinite loop

This code goes on a infinite loop开发者_如何学Python and gives me a

Fatal error: Maximum execution time of 30 seconds exceeded

This is the code i am using

<?php 
$sofar = 1;

while ($sofar == 1);
{
echo $sofar;
$sofar == $sofar+1;
}

?>

Your problem is using two equal signs for the increment. Ie $sofar = $sofar + 1 is correct but you have $sofar == instead. Alternatively just $sofar++ or ++$sofar works.

your basically doing

if($sofar == $sofar+1){/*Nothing*/}

so your expression would evaluate to

if(1 == 2){/*nothing*/}

There for $sofar never cahnges, you have to use = to change or set the value of a variable.

your also adding a semi-colon at the end of your while statement, The semicolon signifies the end of a PHP statement.

You should be doing

if( condition )
{

}

<?php 
$sofar = 1;

while ($sofar == 1)
{
echo $sofar;
$sofar = $sofar+1;
}

?>

You have one = sign too many

And you have an ; after your while.

One = sign assign value Two == signs compare values

You could also use:

$sofar++;
$sofar += 1;
$sofar = $sofar +1;

Or perhaps:

$sofar = 1;

while ($sofar == 1)
{
    echo ++$sofar;
}

Yes, definitely, it should be:

$sofar = $sofar + 1

rather than

$sofar == $sofar + 1

The latter one (which you are using) is a conditional statement.

Your using == which is not an assignment operator but a conditional operators.

you should be doing $sofar = $sofar+1; or $sofar++; to increment the value

== is a comparison operator, not assigment operator (=) so that instruction $sofar == $sofar+1; actually doesn't do anything (it returns false to nowhere).

In other words: $sofar is always 1.

You have a semicolon at the end of your while statement. This is equivalent to

while ($sofar == 1) {

}

and will therefore result in an infinite loop. Also, you are doing a comparison, not an assignment. Your code should look like this:

<?php 
$sofar = 1;

while ($sofar == 1)
{
echo $sofar;
$sofar = $sofar+1;
}

?>

<?php 
$sofar = 1;

while ($sofar == 1) {
  echo $sofar;
  $sofar++;
}
?>

Increment with ++.