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Can somebody explain me this code? I don't understand why it outputs 21.
<?php
function math($t){
if($t==0)
return 0;
return $t+ math($t-1);
}
echo math(6);
?>
It will echo 21. I have no idea how it got this result.
The function is recursive, it calls itself until it gets to 0, then adds all the previously returned values (6,5,4,3,2,1).
function math($t){
if($t==0)
return 0;
return $t+ math($t-1);
}
echo math(6);
So on loop one it gets 6 then 6-1 = 5 so math gets called again with 5 this time and so on. Take a look at http://sandbox.onlinephpfunctions.com/code/e228f3b696c5058efee03fa978a09179c1f2ffbb.
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I wrote a program that uses an ISBN to query Amazon for that ISBN's price, and returns the following result:
5cb66919-8a8d-4c13-9175-790f0476508d0.0401580000000000TrueISBN9780340979266OffersAllAll0340979267809USD$8.09688USD$6.88598USD$5.98241010000
I need to format this so that I have the price information in a format that would be understandable to a human.
How can I do this?
Use this way..
<?php
$s = '5cb66919-8a8d-4c13-9175-790f0476508d0.0401580000000000TrueISBN9780340979266OffersAllAll0340979267809USD$8.09688USD$6.88598USD$5.982410100000';
$p = explode('USD',$s);
echo "<pre>";
print_r($p);
echo "</pre>";
?>
function returnPrice($response){
$prices = explode('USD',$response);
unset($prices[0]);
return $prices;
}
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I have a number field: <?php echo $entity->field_zip_code_name[0];?>
I want to create an if then statement based on the output number. Here is what I have:
if ($entity->field_areacode[0] = 92919,92923,94975,37783) {
<h3 style="font-size: 20px;"><strong>Area Code:</strong></h3>;
}
else {
NONE;
}
any help would be greatly appreciated.
Not sure what x is, if it's $entity->field_zip_code_name[0] then echo that:
if(in_array($entity->field_zip_code_name[0], [92919,92923,94975,37783])) {
//display x
}
If your PHP version doesn't support [] then use array():
if(in_array($entity->field_zip_code_name[0], array(92919,92923,94975,37783))) {
//display x
}
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I have an array like
$remarks = array('Poor','Fair','Good');
I want to access the array index by function call in it.
echo $remarks[myindex($id)];
where myindex() is a function which returns some number value from database.
How can I access the array index of my array at run time
As per you say..
myindex is a function which returns a value between 0-2 then I want to
display array value of that index
<?php
$remarks = array('Poor','Fair','Good');
function myIndex()
{
return rand(0,2);
}
echo $remarks[myIndex()]; //"prints" either Poor , Fair or Good randomly..
The myIndex() function returns a random value between 0,1 or 2 , so that is passed as the index value to your array and it prints the values either Poor , Fair or Good.
it may be
function myindex($id){
return $id % 3;
}
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I want to create a recursive function that displays in order n numbers from greatest to 2 that are pair. If n=5 it should display:
10 8 6 4 2
To get the pair number displayed, I am using:
if($i %2==0)
echo $i
to order from the greatest I also use i--. The problem is I don't know how this recursive function really works.
Do something like this...
<?php
$inc=2;
recv(7); // Calling your recursive function i.e. passing the parameter 5 or 7
function recv($v) // Your function definition
{
global $inc;
if($v>=1)
{
echo $inc*$v." ";
$v--;
recv($v); // Function calls itself in other words "recursive call"
}
}
OUTPUT :
14 12 10 8 6 4 2
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I don't know exactly how to say this, I'll use an example.
//[$var:Username|n] will print username with n length
$myText = 'The participants are [$var:Username|10], [$var:Username|8], and [$var:Username|6]';
$username = array('Alexandrite', 'Maximillian', 'Angelina');
$result = someFunction('[$var:Username|n]', $username, $myText);
echo $result;
//The participants are Alexandrit, Maximill, and Angeli
Any idea how to do this? Maybe using preg_replace?
I'm interested to know why you would even need to do this. Regardless:
preg_replace_callback('/\[\$var:Username\|(\d+)\]/', function ($match)
use (&$count, $username
) {
return substr($username[$count++], 0, $match[1]);
}, $myText);