How to replace a string at a specified position in php

In PHP, you can use the str_replace() function to replace a string at a specified position. The syntax format is "substr_replace(string,replacement,start,length)". The parameter start is used to specify the replacement position (in the string where to start the replacement).

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php replaces the specified location string

<?php
$str = &#39;hello world&#39;;
// 替换指定位置的字符
$str = substr_replace($str,"earth",6);;
// 显示字符
echo $str;
?>

Output:

hello earth

Related function description:

substr_replace() function replaces part of a string with another string. The syntax is as follows:

substr_replace(string,replacement,start,length)

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