How to specify positional replacement in php

How to specify positional replacement in php?

Using the substr_replace() function

Definition and usage
The substr_replace() function replaces part of a string with another string.

Syntax
substr_replace(string,replacement,start,length)

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

string Required. Specifies the string to check

replacement Required. Specifies the string to be inserted.

start Required. Specifies where in the string to start replacing

Optional. Specifies how many characters to replace.

Recommended tutorial: "php tutorial"

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