php remove n chars from nth index of a string

Question

This question relates to an existing topic here..

Remove first 4 characters of a string with PHP

but instead what if i would like to remove specific number of characters from a specific index of a string?

e.g

(i want to remove 8 characters from the fourth index)
$input = 'asdqwe123jklzxc';
$output = 'asdlzxc';

score 8 · Answer 1 · edited Apr 23 '14 at 14:21

8

I think you need this:

echo substr_replace($input, '', 3, 8);

More information here:

http://www.php.net/manual/de/function.substr-replace.php

edited Apr 23 '14 at 14:21

Francisco Corrales Morales

3,676
1
37
64

answered Apr 23 '14 at 13:58

Hammurabi

305
1
3
7

score 4 · Accepted Answer · answered Apr 23 '14 at 13:49

4

$input = 'asdqwe123jklzxc';
echo str_replace(substr($input, 3, 8), '', $input);

Demo

answered Apr 23 '14 at 13:49

John Conde

217,595
99
455
496

1

This may replace more than intended if the string found by substr has more than one occurrence in $input. The answer by Hammurabi below is better in that case. – Oylex Nov 10 '16 at 15:30
This is not the correct answer. It has a huge technical mistake as pointed out by @Oylex – Omar Tariq Oct 03 '18 at 07:07

score 0 · Answer 3 · answered Apr 23 '14 at 13:54

You can try with:

$output = substr($input, 0, 3) . substr($input, 11);

Where 0,3 in first substr are 4 letters in the beggining and 11 in second is 3+8.

For better expirience you can wrap it with function:

function removePart($input, $start, $length) {
  return substr($input, 0, $start - 1) . substr($input, $start - 1 + $length);
}

$output = removePart($input, 4, 8);

score 0 · Answer 4 · answered Dec 17 '18 at 02:30

0

I think you can try :

function substr_remove(&$input, $start, $length) {
    $subpart = substr($input, $start, $length);
    $input = substr_replace($input, '', $start, $length);
    return $subpart;
}

answered Dec 17 '18 at 02:30

Quyền Lê

1
1

php remove n chars from nth index of a string

4 Answers4