string chops

[nadeemshafi9]

hi guys

 

i have a string, i have a position 1 and position 2, the length of the string is variable

 

i need the text between position 1 and position 2

 

lets call them p1 and p2

 

i am looking at substring substr(text, p1, I DONT KNOW THE LENGTH)

 

i need to work out the length from p1 to p2 in order to use substr

 

ANY help welcome

 

thanks

[br0ken]

<?php

echo substr($var, $p1, strpos($var, $p2));

?>

[DarkWater]

@br0ken:  I'm pretty sure that's not going to work.

 

@Thread starter:  I think they call it "subtraction". =P  Did you try that?

[br0ken]

Will this? I can't access my server so am unable to test at the minute.

 

<?php

 

echo substr($var, $p1, (strpos($var, $p2)-strlen($var)));

 

?>

[DarkWater]

Uhh....I was thinking:

 

echo substr($string, $p1, $p2-$p1);

 

Let's say $p1 = 3 and $p2 = 7.  He wants between $p1 and $p2.  So he starts at $p1 (first parameter), and goes 4 forward ($p2-$p1). >_>  Unless I'm just going crazy, that's how you do it.  But I very well could be. Kind of just woke up. xD

[nadeemshafi9]

Uhh....I was thinking:

 

echo substr($string, $p1, $p2-$p1);

 

Let's say $p1 = 3 and $p2 = 7.  He wants between $p1 and $p2.  So he starts at $p1 (first parameter), and goes 4 forward ($p2-$p1). >_>  Unless I'm just going crazy, that's how you do it.  But I very well could be. Kind of just woke up. xD

 

everyones sayin g thats how u do it, its not making sense to me and its the only thing holding me back how can p2-p1 be the length, 

 

 

eg

 

 

 

.....p1....p2.

 

 

 

p1 = 5

 

p2 = 9

 

p2 - p1 = 3 ???????

 

...

[DarkWater]

9-5 is 4, by the way.  Anyway, the length parameter of the substr() function refers to how far to go from the start parameter.  So if you want to go from 5-9, you start at 5 and go 4 forward (9-5). =P  Get it?

[nadeemshafi9]

i understand now that p2 - p1 gives you the length and it is right, so thanks guys, somone in teh office already told me lol but i just couldent see it in my head even thogh i know its right, my damn algorrithm isnt working