substr_replace() function in PHP

The substr_replace() function is used to replace part of a string with another string.

Syntax

substr_replace(str,replacement,begin,len)

Parameters

• str - The string to check

• replacement - The string to be inserted

• begin - The position where the replacement begins -

  • If begin is a positive number: start replacing from the specified position in the string

  • If begin is n number: - start replacing at the specified position from the end of the string

  • If begin is 0 - start replacing from the first character in the string.

• len - The number of characters to replace. Defaults to the same length as the string.

  • If len is a positive number - the length of the string to be replaced

  • If len is a negative number - how much should be left at the end of the string after replacement characters

  • If len is 0 - insert instead of replace.

Return

substr_replace() function returns the replaced string.

Example h2>

The following is an example-

Live demonstration

<?php
   echo substr_replace("Demo text","word",5);
?>

Output

The following is the output-

Demo word

Example

Let's see another example, replace string from end of string -

Live Demonstration

<?php
   echo substr_replace("Demo text","word",-5);
?>

Output

Here is the output-

Demoword

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