Parameter	Description
string	Required. Specifies the string to check
replacement	Required. Specifies the string to insert
start	Required. Specifies where to start replacing in the string A positive number - Start replacing at the specified position in the string Negative number - Start replacing at the specified position from the end of the string 0 - Start replacing at the first character in the string
length	Optional. Specifies how many characters should be replaced. Default is the same length as the string. A positive number - The length of string to be replaced A negative number - How many characters should be left at end of string after replacing 0 - Insert instead of replace

Tips and Notes

Note: If start is a negative number and length is less than or equal to start, length becomes 0.

Example

<?php
echo substr_replace("Hello world","earth",6);
?>

The output of the code above will be:

Hello earth

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