In this PHP tutorial, you shall learn how to insert a given character at specific index in the string using substr_replace() function, with example programs.

PHP – Insert character at specific index in string

To insert character at specific index in string in PHP, call substr_replace() function and pass the given string, the character(as string), index/position at which we need to insert the character, and 0 as arguments.

Syntax

The syntax to insert a character ch in a string str at index/position pos is

substr_replace($str, $ch, $pos, 0)
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Examples

1. Insert char ‘m’ in string at position 3

In this example, we take a string in str , char in ch, position/index in pos. We shall create a new string with the character ch inserted in the string str at index pos.

PHP Program

<?php
  $str = 'apple';
  $ch = 'm';
  $pos = 3;
  $output = substr_replace($str, $ch, $pos, 0);
  echo $output;
?>

Output

PHP - Insert character at specific index in string

Conclusion

In this PHP Tutorial, we learned how to insert a given character in a string at specific index/position, using substr_replace() function, with the help of examples.