How to replace the first character in php

In PHP, you can use the substr_replace() function to replace the first character of a string. The syntax format is "substr_replace (specify string object, characters used for replacement, 0, 1)". The substr_replace() function can replace part of a string with another string.

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

php replace the first character of the string

<?php
$str1 = &#39;hello world!&#39;;
$str2 = substr_replace($str1,&#39;H&#39;,0,1);
print_r($str2);
?>

Output:

Hello world!

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Related function description:

substr_replace() function replaces part of a string with another string. Syntax:

substr_replace(string,replacement,start,length)

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

Return value: Returns the replaced string. If string is an array, the array is returned.

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