Here is my php:
<?
$i = 0;
function f() {
$i++;
echo $i;
if ($i < 3) {
return true;
}
}
while(f())
?>
I was expecting output to be 123
But I get this:
Fatal error: Maximum execution time of 30 seconds exceeded in exp.php on line 5
$i is not defined in function's scope. Everytime it resets to zero.
$i = 0;
function f() {
global $i;
$i++;
echo $i;
return $i<3; //thanks @styxxy
}
while (f());
The $i variable inside your function is a local variable (of that function). If you want to access the variable(s) outside the function, use global. This has to do with the variable scope.
<?php
$i = 0;
function f() {
global $i;
$i++;
echo $i;
if ($i < 3) return true;
return false;
}
while(f());
It is also good practice to make sure you return a value on all code paths (and not rely on the the defaults).
if ($i < 3) return true; return false; can be shortened to return ($i < 3);$i is a global variable, declared outside of the function. The other $i is a local variable, it has a storage location but no initial value. If you want to refer to the global variable from within the function, add the global keyword...
i is a global variable right?
i think you should make it known to the function f().
Like this
global $i;
Why not just:
$i = 0;
while($i<3){
$i++;
f($i);
}
function f($i){
echo $i;
}
$f = function() use($i) {...}and thenwhile($f())