CODEWITHSUNDEEP
phpstring
TigerTiger
TigerTiger

Reputation: 10806

How to insert a string inside another string?

Just looked at function 

str_pad($input, $pad_length, $pad_str, [STR_PAD_RIGHT, STR_PAD_LEFT, or STR_PAD_BOTH])

which helps to pad some string on left, right or on both sides of a given input.

Is there any php function which I can use to insert a string inside an input string?

for example .. 

$input = "abcdef";
$pad_str = "@";

so if I give insert index 3, it inserts "@" after first 3 left most characters and $input becomes "abc@def".

thanks

Upvotes: 31

Views: 53388

Answers (3)

Vinko Vrsalovic
Vinko Vrsalovic

Reputation: 340201

Bah, I misread the question. You want a single insert, not insert every X characters. Sorry.

I'll leave it here so it's not wasted.

You can use regular expressions and some calculation to get your desired result (you probably could make it with pure regexp, but that would be more complex and less readable)

vinko@mithril:~$ more re.php
<?php

$test1 = "123123123";
$test2 = "12312";

echo puteveryXcharacters($a,"@",3);
echo "\n";
echo puteveryXcharacters($b,"@",3);
echo "\n";
echo puteveryXcharacters($b,"$",3);
echo "\n";

function puteveryXcharacters($str,$wha,$cnt) {
  $strip = false;
  if (strlen($str) % $cnt == 0) {
    $strip = true;
  }
  $tmp = preg_replace('/(.{'.$cnt.'})/',"$1$wha", $str);
  if ($strip) {
    $tmp = substr($tmp,0,-1);
  }
  return $tmp;
}

?>
vinko@mithril:~$ php re.php
123@123@123
123@12
123$12

Upvotes: 2

databyss
databyss

Reputation: 6488

You're looking for a string insert, not a padding.

Padding makes a string a set length, if it's not already at that length, so if you were to give a pad length 3 to "abcdef", well it's already at 3, so nothing should happen.

Try:

$newstring = substr_replace($orig_string, $insert_string, $position, 0);

PHP manual on substr_replace

Upvotes: 66

SilentGhost
SilentGhost

Reputation: 319561

you need:

substr($input, 0, 3).$pad_str.substr($input, 3)

Upvotes: 3

Related Questions