I need to delete the first 3 letters of a string and the last 3 letters of a string. I know I can use substr() to start at a certain character but if I need to strip both first and last characters i’m not sure if I can actually use this. Any suggestions?
Pass a negative value as the
length argument (the 3rd argument) to
$result = substr($string, 3, -3);
<?php $string = "Sean Bright"; $string = substr($string, 3, -3); echo $string; ?>
this will always get first and last without having to use strlen.
<?php $input = ",a,b,d,e,f,"; $output = substr($input, 1, -1); echo $output; ?>
As stated in other answers you can use one of the following functions to reach your goal:
- substr($string, 3,
-3) removes 3 chars from start and end
- trim($string, “,”) removes all specific chars from start and end
- ltrim($string, “.”) removes all specific chars from start
- rtrim($string, “;”) removes all specific chars from end
It depends on the amount of chars you need to remove and if the removal needs to be specific. But finally
substr() answers your question perfectly.
Maybe someone thinks about removing the first/last char through string dereferencing. Forget that, it will not work as
null is a char as well:
<?php $string = 'Stackoverflow'; var_dump($string); $string = null; var_dump($string); $string = null; var_dump($string); echo ord($string) . PHP_EOL; $string = ''; var_dump($string); echo ord($string) . PHP_EOL; ?>
string(13) "Stackoverflow" string(13) "tackoverflow" string(13) "tackoverflow" 0 string(13) "ackoverflow" 0
And it is not possible to use
unset($string) for strings:
Fatal error: Cannot unset string offsets in /usr/www/***.php on line **
substr($string, 3, strlen($string) - 6)
I don’t know php, but can’t you take the length of the string, start as position 3 and take length-6 characters using substr?