Create 2 text field web form where 1 field allows the user to specify the text spring to search for and the other field allows the user to specify the replacement string. the page should also show a sentence of your choosing that the search and replace will be performed on.

<?php

$error = '';

$string = "This is a sample string. Hello World";

if(isset($_POST["modify_str"])){

$show_form = false;

extract($_POST);

// check that user entered some value

if(empty($string_search)){

$error += 'Please fill out the string to be searched for <br>';

$show_form = true;

}

// check that user entered some value

if(empty($string_replace)){

$error += "Please fill out the string/word to be replaced for <br>";

$show_form = true;

}

// if user has entered some value, then replace it in the string using the str_replace function and print the string after modification

if (!$show_form){

$string = str_replace($string_search, $string_replace, $string);

echo "String after modification: <br>";

echo $string;

}

}

else

{

$show_form = true;

}

if($show_form)

{

?>

Please select any word to search for and replace for in the following string <br>

<?php echo $string; ?>

<br> <br>

<form action="" method="post">

<label for="string_search"> String to search for: </label>

<input type="text" name="string_search" id="string_search" required="required" /> <br> <br>

<label for="string_replace"> Replace with: </label>

<input type="text" name="string_replace" id="string_replace" required="required" /> <br> <br>

<input type="submit" id="modify_str" name="modify_str" value="Modify String"/>

</form>

<?php

}

?>

Explanation:

The program was written with php.

It is designed such that it can create 2 text field web form where 1 field allows the user to specify the text spring to search for and the other field allows the user to specify the replacement string.

See answer for the program code.