Return true php

Clash Royale CLAN TAG#URR8PPP

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6
down vote

favorite

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A friend got this question during an interview:

What should be the value of x so that the following function returns true.

<?php
function returnTrue( $x )
 $x[$x] = $x;
 return $x != true;

$res = returnTrue(YOUR_ANSWER);
var_dump($res);
?>

The answer should be 3 characters max

php

share|improve this question

asked 3 hours ago

TSR

1,04711029

add a comment | 

up vote
6
down vote

favorite

1

A friend got this question during an interview:

What should be the value of x so that the following function returns true.

<?php
function returnTrue( $x )
 $x[$x] = $x;
 return $x != true;

$res = returnTrue(YOUR_ANSWER);
var_dump($res);
?>

The answer should be 3 characters max

php

share|improve this question

asked 3 hours ago

TSR

1,04711029

add a comment | 

up vote
6
down vote

favorite

1

up vote
6
down vote

favorite

1

1

A friend got this question during an interview:

What should be the value of x so that the following function returns true.

<?php
function returnTrue( $x )
 $x[$x] = $x;
 return $x != true;

$res = returnTrue(YOUR_ANSWER);
var_dump($res);
?>

The answer should be 3 characters max

php

share|improve this question

asked 3 hours ago

TSR

1,04711029

A friend got this question during an interview:

What should be the value of x so that the following function returns true.

<?php
function returnTrue( $x )
 $x[$x] = $x;
 return $x != true;

$res = returnTrue(YOUR_ANSWER);
var_dump($res);
?>

The answer should be 3 characters max

php

php

share|improve this question

asked 3 hours ago

TSR

1,04711029

share|improve this question

asked 3 hours ago

TSR

1,04711029

share|improve this question

share|improve this question

asked 3 hours ago

TSR

1,04711029

asked 3 hours ago

TSR

1,04711029

asked 3 hours ago

TSR

1,04711029

1,04711029

add a comment | 

add a comment | 

3 Answers
3

active

oldest

votes

up vote
2
down vote



accepted

That was interesting, I gave this test a quick try and the answer is :

$res = returnTrue();

share|improve this answer

answered 2 hours ago

Rémi Bosgaerd

9710

• 
  
  
  

  
  

  
  
  
  
  
  

  
  did you notice that your code will trigger an illegal offset warning?I think that a question designed for an interview can't lead to this type of error.But it is just an opinion....
  – Elementary
  2 hours ago
  

  
  
  
  

add a comment | 

up vote
1
down vote

of course this

returntrue();

works
but not completely fine as you would receive the message

Warning: Illegal offset type in ....

You must keep in my in mind that string type also allows arrayAccess style so

the right answer is

$res=returntrue('0');
var_dump($res)// print true

When you give as argument the string '0' this code $x[$x]=$x give again the same string '0'
wich will not produce any warning and will absolutely return true as the string '0' will always be evaluated as false and false!=true return true

share|improve this answer

edited 2 hours ago

answered 2 hours ago

Elementary

1,2481215

• 
  
  
  

  
  

  
  
  
  
  
  

  
  A better (and probably the correct) solution in my opinion.
  – Nick
  15 mins ago
  
  

  
  
  
  

add a comment | 

up vote
0
down vote

And also for the other post now deleted, I also managed to solve it.

function returnTrue( $x )

 if( !is_array( $x ) ) 
 return false;
 
 foreach( $x as $x ) 
 $x = $x;
 
 return $x;


var_dump(returnTrue([!0]));

share|improve this answer

answered 2 hours ago

Rémi Bosgaerd

9710

add a comment | 

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

active

oldest

votes

active

oldest

votes

up vote
2
down vote



accepted

That was interesting, I gave this test a quick try and the answer is :

$res = returnTrue();

share|improve this answer

answered 2 hours ago

Rémi Bosgaerd

9710

• 
  
  
  

  
  

  
  
  
  
  
  

  
  did you notice that your code will trigger an illegal offset warning?I think that a question designed for an interview can't lead to this type of error.But it is just an opinion....
  – Elementary
  2 hours ago
  

  
  
  
  

add a comment | 

up vote
2
down vote



accepted

That was interesting, I gave this test a quick try and the answer is :

$res = returnTrue();

share|improve this answer

answered 2 hours ago

Rémi Bosgaerd

9710

• 
  
  
  

  
  

  
  
  
  
  
  

  
  did you notice that your code will trigger an illegal offset warning?I think that a question designed for an interview can't lead to this type of error.But it is just an opinion....
  – Elementary
  2 hours ago
  

  
  
  
  

add a comment | 

up vote
2
down vote



accepted

up vote
2
down vote



accepted

That was interesting, I gave this test a quick try and the answer is :

$res = returnTrue();

share|improve this answer

answered 2 hours ago

Rémi Bosgaerd

9710

That was interesting, I gave this test a quick try and the answer is :

$res = returnTrue();

share|improve this answer

answered 2 hours ago

Rémi Bosgaerd

9710

share|improve this answer

share|improve this answer

answered 2 hours ago

Rémi Bosgaerd

9710

answered 2 hours ago

Rémi Bosgaerd

9710

answered 2 hours ago

Rémi Bosgaerd

9710

9710

• 
  
  
  

  
  

  
  
  
  
  
  

  
  did you notice that your code will trigger an illegal offset warning?I think that a question designed for an interview can't lead to this type of error.But it is just an opinion....
  – Elementary
  2 hours ago
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  

  
  
  
  
  
  

  
  did you notice that your code will trigger an illegal offset warning?I think that a question designed for an interview can't lead to this type of error.But it is just an opinion....
  – Elementary
  2 hours ago
  

  
  
  
  

did you notice that your code will trigger an illegal offset warning?I think that a question designed for an interview can't lead to this type of error.But it is just an opinion....
– Elementary
2 hours ago

did you notice that your code will trigger an illegal offset warning?I think that a question designed for an interview can't lead to this type of error.But it is just an opinion....
– Elementary
2 hours ago

add a comment | 

up vote
1
down vote

of course this

returntrue();

works
but not completely fine as you would receive the message

Warning: Illegal offset type in ....

You must keep in my in mind that string type also allows arrayAccess style so

the right answer is

$res=returntrue('0');
var_dump($res)// print true

When you give as argument the string '0' this code $x[$x]=$x give again the same string '0'
wich will not produce any warning and will absolutely return true as the string '0' will always be evaluated as false and false!=true return true

share|improve this answer

edited 2 hours ago

answered 2 hours ago

Elementary

1,2481215

• 
  
  
  

  
  

  
  
  
  
  
  

  
  A better (and probably the correct) solution in my opinion.
  – Nick
  15 mins ago
  
  

  
  
  
  

add a comment | 

up vote
1
down vote

of course this

returntrue();

works
but not completely fine as you would receive the message

Warning: Illegal offset type in ....

You must keep in my in mind that string type also allows arrayAccess style so

the right answer is

$res=returntrue('0');
var_dump($res)// print true

When you give as argument the string '0' this code $x[$x]=$x give again the same string '0'
wich will not produce any warning and will absolutely return true as the string '0' will always be evaluated as false and false!=true return true

share|improve this answer

edited 2 hours ago

answered 2 hours ago

Elementary

1,2481215

• 
  
  
  

  
  

  
  
  
  
  
  

  
  A better (and probably the correct) solution in my opinion.
  – Nick
  15 mins ago
  
  

  
  
  
  

add a comment | 

up vote
1
down vote

up vote
1
down vote

of course this

returntrue();

works
but not completely fine as you would receive the message

Warning: Illegal offset type in ....

You must keep in my in mind that string type also allows arrayAccess style so

the right answer is

$res=returntrue('0');
var_dump($res)// print true

When you give as argument the string '0' this code $x[$x]=$x give again the same string '0'
wich will not produce any warning and will absolutely return true as the string '0' will always be evaluated as false and false!=true return true

share|improve this answer

edited 2 hours ago

answered 2 hours ago

Elementary

1,2481215

of course this

returntrue();

works
but not completely fine as you would receive the message

Warning: Illegal offset type in ....

You must keep in my in mind that string type also allows arrayAccess style so

the right answer is

$res=returntrue('0');
var_dump($res)// print true

When you give as argument the string '0' this code $x[$x]=$x give again the same string '0'
wich will not produce any warning and will absolutely return true as the string '0' will always be evaluated as false and false!=true return true

share|improve this answer

edited 2 hours ago

answered 2 hours ago

Elementary

1,2481215

share|improve this answer

share|improve this answer

edited 2 hours ago

edited 2 hours ago

edited 2 hours ago

answered 2 hours ago

Elementary

1,2481215

answered 2 hours ago

Elementary

1,2481215

answered 2 hours ago

Elementary

1,2481215

1,2481215

• 
  
  
  

  
  

  
  
  
  
  
  

  
  A better (and probably the correct) solution in my opinion.
  – Nick
  15 mins ago
  
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  

  
  
  
  
  
  

  
  A better (and probably the correct) solution in my opinion.
  – Nick
  15 mins ago
  
  

  
  
  
  

A better (and probably the correct) solution in my opinion.
– Nick
15 mins ago

A better (and probably the correct) solution in my opinion.
– Nick
15 mins ago

add a comment | 

up vote
0
down vote

And also for the other post now deleted, I also managed to solve it.

function returnTrue( $x )

 if( !is_array( $x ) ) 
 return false;
 
 foreach( $x as $x ) 
 $x = $x;
 
 return $x;


var_dump(returnTrue([!0]));

share|improve this answer

answered 2 hours ago

Rémi Bosgaerd

9710

add a comment | 

up vote
0
down vote

And also for the other post now deleted, I also managed to solve it.

function returnTrue( $x )

 if( !is_array( $x ) ) 
 return false;
 
 foreach( $x as $x ) 
 $x = $x;
 
 return $x;


var_dump(returnTrue([!0]));

share|improve this answer

answered 2 hours ago

Rémi Bosgaerd

9710

add a comment | 

up vote
0
down vote

up vote
0
down vote

And also for the other post now deleted, I also managed to solve it.

function returnTrue( $x )

 if( !is_array( $x ) ) 
 return false;
 
 foreach( $x as $x ) 
 $x = $x;
 
 return $x;


var_dump(returnTrue([!0]));

share|improve this answer

answered 2 hours ago

Rémi Bosgaerd

9710

And also for the other post now deleted, I also managed to solve it.

function returnTrue( $x )

 if( !is_array( $x ) ) 
 return false;
 
 foreach( $x as $x ) 
 $x = $x;
 
 return $x;


var_dump(returnTrue([!0]));

share|improve this answer

answered 2 hours ago

Rémi Bosgaerd

9710

share|improve this answer

share|improve this answer

answered 2 hours ago

Rémi Bosgaerd

9710

answered 2 hours ago

Rémi Bosgaerd

9710

answered 2 hours ago

Rémi Bosgaerd

9710

9710

add a comment | 

add a comment | 

 

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