Have you been coding PHP for many years but have not gone beyond few functions?, this thread tests your practical knowledge of the language.
Please, don't post off-topic here, just serious contributions involving code and useful comments..

I'd take this from easy to hard and anybody can drop in a question at anytime.

Now, first question:

$first_string = 'DanielTheGeek' ;
$second_string = 'Daniel' ;
if (strpos($first_string, $second_string)) {
echo "\"" . $first_string . "\" contains \"" . $second_string . "\"" ;
} else {
echo "\"" . $first_string . "\" does not contain \"" . $second_string . "\"" ;
}

If you run the above code, you'd get:
"DanielTheGeek" does not contain "Daniel"

Why?

What needs to be changed to make the above code work as expected?

UPDATE: Five points for the first correctly answered question, a leaderboard will be published with the names of people that have high points.

\"" . $second_string . "\"" ; }

phensbassey:
\"" . $second_string . "\"" ; }

Wrong

DanielTheGeek:
Have you been coding PHP for many years but have not gone beyond few functions?, this thread tests your practical knowledge of the language.
Please, don't post off-topic here, just serious contributions involving code and useful comments..

I'd take this from easy to hard and anybody can drop in a question at anytime.

Now, first question:



If you run the above code, you'd get:
"DanielTheGeek" does not contain "Daniel"

Why?

What needs to be changed to make the above code work as expected?

UPDATE: Five points for the first correctly answered question, a leaderboard will be published with the names of people that have high points.

I think that function must be passed with 3 parameters.

The last one being the position to start the search from.

Will look at the code very well later

FrankLampard:


I think that function must be passed with 3 parameters.

The last one being the position to start the search from.

Will look at the code very well later

Put it in form of a solution and let's see, you are wrong tho.

Hint: How is it supposed to work normally?

the function strpos() is case-sentitive, you should use stripos() instead

@danielthegeek

Its because the return value is 0 which is interpreted as false by the if condition. To correct that, you will check the TYPE as well using ===

if (strpos(...) !== false) {
echo 'contain'
;
} else {
echo 'does not contain'
;
}

losprince:
the function strpos() is case-sentitive, you should use stripos() instead

Case sensitivity is not the problem here..

Again, a plainer hint: What does strpos() do, and what does it return when the condition in our case is not met.

toheebDOTcom:
@danielthegeek

Its because the return value is 0 which is interpreted as false by the if condition. To correct that, you will check the TYPE as well using ===

I wanted to say that, but I thought of other possibilities.

You can assign the strpos() to a variable and then check if true or false.

Eg
$strpos = strpos($first_string, $second_string);
if($strpos !== false)
{
True
}
False

NB: I No test sha, and I no look documentation.

toheebDOTcom:
@danielthegeek

Its because the return value is 0 which is interpreted as false by the if condition. To correct that, you will check the TYPE as well using ===

Impressive, very close I must say...but still wrong.
I like the way you think tho.

Remember the result of the strpos() function isn't stored in a variable, so think, and
try again and this time, in form of code.

Where is my 5 points danielthegeek?

toheebDOTcom:
Where is my 5 points danielthegeek?

Write your answer in form of code please, remember, newbies are watching.

I don put code oo danielthegeek.


@franklampard Yea!. That is the only reason

toheebDOTcom:
@danielthegeek

Its because the return value is 0 which is interpreted as false by the if condition. To correct that, you will check the TYPE as well using ===

if (strpos($string_one, $string_two) !== false) {
echo 'contain'
} else {
echo 'does not contain'
}

Okay, ToheebDOTcom provided the correct answer...thumbs up FrankLampard (also correct but late) and the rest for trying.

Beginners, please note the use of !== over !=. If != was used, 0 will be falsy when referenced in a boolean expression.

So ToheebDOTcom has 5 points.
Next question:
What will be the outcome of:

$foo = true and false; var_dump($foo) ;

And why?

DanielTheGeek:
So ToheebDOTcom has 5 points.

Next question:

What will be the outcome of:


And why?

var_dump returns bool.


Modify your question correctly.
Did you mean...
$foo = 'true and false';

or

$foo = true;

$foo = false;

If it is the first case

var_dump returns string



Answer to your modified question..
it returns false..

since it is not in quotes, then 'and'is evaluated as a logical operator. by truth table, truth and false results to false...

Chikena!

Signs Out of thread

toheebDOTcom:


var_dump returns bool.


Modify your question correctly.
Did you mean...
$foo = 'true and false';

or

$foo = true;

$foo = false;

If it is the first case

var_dump returns string

I meant what I wrote at first (which is indirectly the second case here), true and false without being encapsulated in quotes.

FrankLampard:
Signs Out of thread

Why?

toheebDOTcom:

var_dump returns bool.

Modify your question correctly. Did you mean... $foo = 'true and false';
or
$foo = true;
$foo = false;
If it is the first case
var_dump returns string

What boolean exactly does it return? True or False? And most importantly, why?

DanielTheGeek:

What boolean exactly does it return? True or False? And most importantly, why?

I modified my answer. I will explain now

I'm enjoying your questions.

But I need to do something now. I will be back to answer those not yet answered. For the sake of knowledge!

Nice one!

toheebDOTcom:


Answer to your modified question..
it returns false

You are right about the outcome being of a boolean data-type but the value it returns is TRUE not FALSE.

Nice try ToheebDOTcom.

Here's why it returns TRUE:
The issue here is that the = operator is more superior to the and operator in order of operations.

Merely glancing at the code, one would expect it to return FALSE, but if you take a second look, it would only have done as we expected if we wrapped it in parenthesis as follows:

$foo = (true and false) ;

I'm happy, Asalimpo is here...great mind that is.

Next question:

So many people use echo() ; and print() ; functions interchangeably, what are the differences between the two functions?

DanielTheGeek:
Next question:

So many people use echo() ; and print() ; functions interchangeably, what are the differences between the two functions?

echo can output multiple statements, print cannot

echo 'yes', 'no', $some_variable;

print 'yes', 'no', $some_variable; //error

toheebDOTcom:


echo can output multiple statements, print cannot

echo 'yes', 'no', $some_variable;

print 'yes', 'no', $some_variable; //error

Correct bro. You've got 10 points.

Don't expect the next question to be easy..

The explanation is what I'm looking for in this question, so the person with the best explanation towards the behaviour of the code below gets the points.

$foo = “bar”;
$foo++;
echo $foo;

What will the above code snippet echo out and why exactly?

^^^
Let's do it this way...

++ is a step incrementor...

$foo++ means output the value of $foo then assign a step increment of the value of $foo to $foo...

So echo $foo; // 'bar'


However, if question were to be ++$foo, it will increment it first before outputting the result...
so echo $foo; // 'bas'

cc: danielthegeek

DanielTheGeek:
The explanation is what I'm looking for in this question, so the person with the best explanation towards the behaviour of the code below gets the points.



What will the above code snippet echo out and why exactly?

"bas" - i dont think this needs an explanation, the last character in the string was incremented. if the string "123" was incremented, the output would be "124". ($var++ !== $var+1)

^^^kodejuice
$foo++ returns the value before incrementing.
++$foo increments before returning the value...

Use any language to solve this very simple.

Question.

By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13.

What is the 10 001st prime number?

toheebDOTcom:
^^^
Let's do it this way...

++ is a step incrementor...

$foo++ means output the value of $foo then assign a step increment of the value of $foo to $foo...

So echo $foo; // 'bar'


However, if question were to be ++$foo, it will increment it first before outputting the result...
so echo $foo; // 'bas'

cc: danielthegeek

Your output is unsurprisingly correct, but I don't think the explanation Is okay.

Why is the string being incremented like a number?
Everyone will expect, $num=1; $num++ ; to return a greater number surely, but for strings...how does it work?