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PHP substr_replace() Function

PHP substr_replace() function is used to replace a part of a given string with another string. The start position and the length of the string is passed as a parameter and if the start is negative and length is less than or equal to start then length become 0 (zero). It is binary-safe.

Syntax:

  substr_replace($string, $replace, $start, $length);

Parameter Values

Parameter	Description
string	This is a required parameter. This parameter defines the string to check.
replace	This is a required parameter. This parameter defines the string to insert.
start	This is a required parameter. This parameter defines where to start replacing in the string.
length	This is an optional parameter. This parameter defines how many characters should be replaced.

Here is an example of substr_replace() function in PHP:

<html>
<body>

<?php
$str1 = "Python";
$str2 = "PHP";

echo substr_replace($str1,$str2,0);
?>

</body>
</html>

Output:
PHP

Here is an example of substr_replace() function in PHP:

<html>
<body>

<?php
$str1 = "Hello !! I am Jerry..";
$str2 = "Everyone";

echo substr_replace($str1,$str2,6,0); // it will insert str2 at position 6
?>

</body>
</html>

Output:
Hello Everyone!! I am Jerry..

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