get to know where a function was called from?

j0sh

hi all.

i'd like to know within a function of a class, where this function has been called from.

example:

1 | $x = "hello";
2 | $x = "cu";
3 | $x = $this->getVar();
4 | echo $x;
5 |
6 | function getVar() {
7 | return _function_called_line;
8 | }
9 | ...

getVar() would return 3, because on line #3 the function was called...
i know that there's a line system var, but is there something like this imaginary _function_called_line too? 🙂

thanks for help!
josh

Shrike

$line = 0;

function myFunc()
{
  global $line;
  $line = __LINE__;
  return $something;
}

$retvalue = myFunc(); // $line now equals the relevant line in the function.

paulnaj

Hi,

Same answer as Shrike ...

<?php 
1 | $x = "hello"; 
2 | $x = "cu"; 
3 | $x = getVar(); 
4 | echo $x; // Returns 7, not 4
5 | 
6 | function getVar() { 
7 | 	return __LINE__; 
8 | } 
?>

Paul. 🙂

j0sh

thanks, but u misunderstood me.

getVar() would return 3, because on line #3 the function was called...

better:
getVar() MUST return 3, because on line #3 the function getVar was called, but the _function_called_line must get the line where getVar was called from! i DO know what line is ! :p

Shrike

getVar();
$line = __LINE__ -1;

j0sh

Originally posted by Shrike
getVar();
$line = __LINE__ -1;
[/B]

sorry, i don't think you understand me...:rolleyes: but thank you

Shrike

Well perhaps you could explain a little better :glare:

paulnaj

Hi, I don't think there's a function/variable like LINE that's going to do what you want.

The only way I can think of is to pass the LINE as an argument to the function ...

<?php 
/* 1 */ $x = "hello"; 
/* 2 */ $x = "cu"; 
/* 3 */ $x = getVar(__LINE__); 
/* 4 */ echo $x; // Returns 3

/* 5 */ function getVar($line) { 
/* 6 */  	return $line; 
/* 7 */ } 
?>

Paul. 🙂

j0sh

ok my dear 🙂

i just see that paulnaj has got the idea! but the problem is, i do not want to pass the line as a param but want to examine it in the function itself! :queasy:

j0sh

isn't there anything like a function call stack or something like that??? this should not be impossible technically, i think... 😕

Shrike

Ah ok. It's possible to get a trace using Exception in PHP 5, but not in PHP 4. A possible hack:

getVar();
$line = __LINE__ -1;
function getVar()
{
  global $line; // The line of the call
}

j0sh

ok thank you, i think about it. 🙂

rehfeld

maybe this will help

http://php.net/manual/en/function.debug-backtrace.php

Weedpacket

There is a FUNCTION ....
http://www.php.net/manual/en/language.constants.predefined.php

j0sh

Originally posted by rehfeld
maybe this will help

http://php.net/manual/en/function.debug-backtrace.php

WOW great! very useful! exactly what i needed! 🆒

thank you very much!