Using Laravel for Advanced String Manipulation in PHP/

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Replacing Strings within a Portion of an Existing String

Replacing Strings within a Portion of an Existing String

Learn how to replace strings within a portion of an existing string.

We'll cover the following...

The substrReplace helper method

This is an interesting one. At a high level, we can use it to replace portions of an existing string.

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<?php
/**
 * Versions: Laravel 8, 9
 *
 * @return string|array
 */
public static function substrReplace(
      string|array $string,
      string|array $replace,
         array|int $offset = 0,
    array|int|null $length = null
);

That can be a confusing explanation, so we can think of it as being capable of doing the following (and more):

  • Inserting text into a current string at a specific location
  • Replacing text in an existing string at a specific location
  • Skipping parts of a string while performing string replacements

In the following example, we will use the substrReplace helper method to replace the last character of our string by supplying the value -1 as our argument for the offset parameter. ...