substr function

[Bendoon]

Hi im trying to use the substr function in php. I have a string called $finalString and im trying to grab the last character of that string the line of code im using is :

 

$startIndex = substr($finalString, -1);

 

it wont work giving the error : 

 

Warning: substr() expects parameter 2 to be long, string given in /users/2017/bfm3/public_html/cs1109/lab10/markovnew.php on line 34

[davidannis]

I cut and pasted your code and surrounded it with my own.

<?php
$finalString="abcd";
$startIndex = substr($finalString, -1);
echo $startIndex;
?>

and it works (output is d). Could you have another line with a substr() in it? Is this really line 34? Did you cut and paste or retype the line when posting?

[Bendoon]

ah ok yes there is another line i use the substr but that wasnt giving trouble until i put in the new substr.

 

$sub = substr($textarea, $startIndex, $ordernumber ); is line 34

 

why is that giving the error then

[Bendoon]

the php manual states i can have 3 parameters

[Bendoon]

So ive got a loop and basically the loop adds a character to the end of $finalString after each loop, i want to then grab the last character of that $finalString and thats what im attempting to do

[Bendoon]

OK i think its because where i have $startIndex on this line:

 

 $sub = substr($textarea, $startIndex, $ordernumber );

 

$startIndex contains an actual character and not a number. Is there a way to instead of using substr to extract the character in that space extract the number of how many characters it is in from the start? So if "hello" was the string and "e" was selected it would contain the number "2" ?

[Ch0cu3r]

Use strpos to find the position of a character

Edited January 23, 2014 by Ch0cu3r