Adding constant to PHP loop variable [closed] - php

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How to add something to PHP's loop variable and check the result? I have this simple code:
<?php
for ($i=0; $i<5; $i++) {
echo "Time: " . $i + 1 . "<br/>";
}
?>
The displayed result in the page:
1
1
1
1
1
But if there's no addition with 1, the result is correct. How to do this addition?

Answer 1

You concat in your question use this:
<?php
for ($i=0; $i<5; $i++) {
echo "Time: " . ($i + 1) . "<br/>";
}
?>

Answer 2

Change this line:
echo "Time: " . $i + 1 . "<br/>";
to this:
echo "Time: " . ($i + 1) . "<br/>";

Answer 3

Put the calculation in brackets:
<?php
for ($i=0; $i<5; $i++) {
echo "Time: " . ($i + 1) . "<br/>";
}
?>

Answer 4

While adding parentheses to give the addition a higher precedence is an option, the easiest way is to turn $i + 1 into an expression, to be resolved to a singular value and then pass it to echo, using comma's:
for ($i=0; $i<5; $i++)
{
echo "Time: " , $i + 1 , "<br/>";
}
But the shortest way to write this is:
for ($i=0;$i<5;)//don't increment here
{
echo 'Time: ', ++$i, '<br/>';//increment here, and make sure to pre-increment
}
Or, more readable (and IMHO therefore better):
for($i=1;$i<6;$i++)
{//start with one, so you needn't increment in the loop body!
echo 'Time: ', $i, '<br/>';
}
Leaving out conactenation is marginally faster, but you'll hardly notice that. It's just an alternative. Think of the two options as this (if you're familiar with C++):
int i = 0;
std::stringstream toPrint;//create string-stream
toPrint << "Time: " << ++i << "<br/>";//pass substrings/int chunks to stream
std::COUT << toPrint.str();//create single string, and pass to output-stream
But that's just silly, considering you're actually creating a stream, just to pass your substrings/ints to, only to pass the resulting string to the output stream. You might as well pass all chunks to the output stream directly:
std::<COUT << "Time: " << ++i << "<br/>"; //pass string, int and string to output
Think of echo as a language construct (which it is) that is your access-point to the STDOUT stream. Whe concatenate a string manually, of you can just pass it to the stream as-is? without any overhead?
As an asside, you can get the output you need in just 2 lines of code, without (explicitly) looping and incrementing a variable:
$vals = range(1,5);//create array 1, 2,3, 4, 5
//repeat format Time: %d<br/> for every index in $vals
vprintf(str_repeat('Time: %d <br/>', count($vals)), $vals);
//pass resulting format to vprintf, allong with the array of values
The output is the same. In case you're thinking about using this: don't. It's just for fun, and an example of how you can take compacting code a bit too far

Answer 5

<?php
for ($i=1; $i <= 5; $i++) {
echo "Time: " . ($i) . "<br />";
}

Answer 6

You are looking to do something like this :
<?php
for ($i=0; $i<5; $i++) {
$j=$i+1;
echo "Time: " . $j . "<br/>";
}
?>

Answer 7

Like DanFromGermany suggested, why not start with $i one higher than currently?
Also if you have to do calculations, the meaning of the var usually differs from it's starting point. So for readability and reusability do what Munjal proposed, but leave out the concatenation;
<?php
for ($i=0; $i<5; $i++) {
$laterTime = $i + 1;
echo "Time: {$laterTime} <br />\n";
}
?>

Answer 8

<?php
for ($i=0; $i<5; $i++) {
$i++;
echo "Time: ".$i. "<br/>";
}
?>
or if you insist on concatenation
<?php
for ($i=0; $i<5; $i++) {
echo "Time: " .++$i. "<br/>";
}
?>