Why can't these functions see my variable? - php

Question

Why do I get this error:
Undefined variable key_2captcha
I run this code to pass a CAPTCHA to 2captcha server:
<?php
$id_Captcha=0;
$key_2captcha="key2captcha";
function send_captcha($base_file){
$ch = curl_init("http://2captcha.com/in.php");
curl_setopt($ch, CURLOPT_POSTFIELDS,
array('method'=>"base64",
'key'=>$key_2captcha,
'numeric'=>1,
'max_len'=>1,
'body'=>$base_file,
'submit'=>'download and get the ID'));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$postResult = curl_exec($ch);
curl_close($ch);
return $postResult;
}
function getSolveCaptcha($id_captcha){
$c = curl_init("http://2captcha.com/res.php?key=".$key_2captcha."&action=get&id=".$id_captcha);
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
$postResult = curl_exec($c);
curl_close($c);
return $postResult;
}
?>
I run this code in XAMPP.

Answer 1

I thinks you have a variabile scope resolution problem.
If you want to use the variable into a generic function, you have to pass this variable as parameter in the signature of function.
Not use variable as global because is a bad practice, you have to make generic function so you have to use generic parameter.
Try this code:
<?php
$id_Captcha=0;
$key_2captcha="key2captcha";
function send_captcha($base_file, $key_2captcha){
$ch = curl_init("http://2captcha.com/in.php");
curl_setopt($ch, CURLOPT_POSTFIELDS,
array('method'=>"base64",
'key'=>$key_2captcha,
'numeric'=>1,
'max_len'=>1,
'body'=>$base_file,
'submit'=>'download and get the ID'));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$postResult = curl_exec($ch);
curl_close($ch);
return $postResult;
}
function getSolveCaptcha($id_captcha, $key_2captcha){
$c = curl_init("http://2captcha.com/res.php?key=".$key_2captcha."&action=get&id=".$id_captcha);
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
$postResult = curl_exec($c);
curl_close($c);
return $postResult;
}
//Call Example
send_captcha($base_file, $key_2captcha);
?>

Answer 2

Use below code use $key_2captcha with global. in both function. read variable scope in PHP
function getSolveCaptcha($id_captcha){
global $key_2captcha;
$c = curl_init("http://2captcha.com/res.php?key=".$key_2captcha."&action=get&id=".$id_captcha);
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
$postResult = curl_exec($c);
curl_close($c);
return $postResult;
}

Answer 3

Use below code with $GLOBALS — References all variables available in global scope
<?php
$id_Captcha=0;
$key_2captcha="key2captcha";
function send_captcha($base_file){
$ch = curl_init("http://2captcha.com/in.php");
curl_setopt($ch, CURLOPT_POSTFIELDS,
array('method'=>"base64",
'key'=>$GLOBALS['key_2captcha'],
'numeric'=>1,
'max_len'=>1,
'body'=>$base_file,
'submit'=>'download and get the ID'));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$postResult = curl_exec($ch);
curl_close($ch);
return $postResult;
}
function getSolveCaptcha($id_captcha){
$c = curl_init("http://2captcha.com/res.php?key=".$GLOBALS['key_2captcha']."&action=get&id=".$id_captcha);
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
$postResult = curl_exec($c);
curl_close($c);
return $postResult;
}
?>
Ref PHP.net