php variable scope

Question

i'm confused about the php variable scope. such as:

while(true){
    $var = "yes , it is a test!";
  }
  printf($var)

the $var is defined in while statement scope , how could we get it outside it's scope ? and i can't find explanation on the document .

i wonder how php deal with it's scope .

Please go back and review your old questions. If there are good sollutions, mark them as accepted using the green 'check'. If there are none (which i doubt), please consider answering your own questions with how you solved the problems in the end. Furthermore, try and check your formatting. — Nanne, Apr 12 '11 at 07:52
This might be a useful starting point: http://php.net/manual/en/language.variables.scope.php — Will Vousden, Apr 12 '11 at 07:53
how about switch() case statement? Does it create its own scope like a function? Thanks~ — user798033, Oct 23 '11 at 21:21
if you want to create a new local scope http://stackoverflow.com/a/33460057/3160597 — azerafati, Nov 01 '15 at 07:21

score 8 · Answer 1 · answered Apr 12 '11 at 07:51

8

while is not a function. scope of variable refers to variable inside functions and classes

answered Apr 12 '11 at 07:51

S L

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score 6 · Answer 2 · answered Apr 12 '11 at 07:52

6

In PHP, a while loop doesn't create a new scope. So it will be available in the function

answered Apr 12 '11 at 07:52

Ikke

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score 3 · Accepted Answer · answered Apr 12 '11 at 07:54

If you do while(true) you will not get out of the while, so it wouldn't matter. But if you would have a real expression, something like this (this is a useless example, i know)

$i=0
while($i<10){ 
   $var = "yes , it is a test!"; 
   $i++;
 } 
 printf($var);

Will just work. There is no special "while" variable scope, the printf will print your string. check : http://php.net/manual/en/language.variables.scope.php

score 2 · Answer 4 · answered Apr 12 '11 at 07:50

2

Loop does not have any scope in PHP. variable is simply available outside the loop.

just echo outside the loop;

echo $var;

answered Apr 12 '11 at 07:50

Shakti Singh

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score 0 · Answer 5 · answered Aug 03 '13 at 23:02

0

Notice: Different PHP-version behave differently on $GLOBALS, $_SERVER ($HTTP_SERVER_VARS [deprecated]) and $_SESSION. Please check that. Old PHP page are not always upwards compatible. You should check that.

answered Aug 03 '13 at 23:02

davidS

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score 0 · Answer 6 · answered Apr 12 '11 at 07:53

0

For the complete answer check the documentation:

http://php.net/manual/en/language.variables.scope.php

answered Apr 12 '11 at 07:53

qbert220

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php variable scope

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