22)Design a HTML form to accept two strings from the user. Write a PHP function to find the first occurrence and the last occurrence of the small string in the large string. Also count the total number of occurrences of small string in the large string. Provide a text box to accept a string, which will replace the small string in the large string. (Use built-in functions)
slip22.html-
<html>
<body>
<form action ="slip22.php" method="get">
<center> <table>
<tr> <td>enter the first string: </td> <td> <input type="text" name="str1"> </td> </tr>
<tr> <td>enter the second string: </td> <td> <input type="text" name="str2"> </td> </tr>
<tr> <td>enter string to replace: </td> <td> <input type="text" name="str3"> </td> </tr>
<tr> <td>occurences </td> <td> <input type="radio" name="ch" value=1> </td>
<td>replace </td> <td> <input type="radio" name="ch" value=2> </td> </tr>
<tr> <td> </td> <td> <input type="submit" value="next"> </td> </tr>
</table>
</body>
</html>
slip22.php-
<?php
$str1=$_GET['str1'];
$str2=$_GET['str2'];
$str3=$_GET['str3'];
$ch=$_GET['ch'];
echo "first string is =".$str1."<br><br>";
echo "second string is =".$str2."<br><br>";
echo "third string is =".$str3."<br><br>";
if(strlen($str1)>strlen($str2))
{
switch($ch)
{
case 1:$pos=strpos($str1,$str2);
if($pos!=0)
echo "string '$str2' not present in start of '$str1'.<br>";
echo "string '$str2' present in start of '$str1'.<br>";
break;
case 2:$str4=str_replace($str2,$str3,$str1);
echo "after replacing string $str4";
break;
}
}
else
{
switch($ch)
{
case 1:$pos=strpos($str2);
echo "after repalcing sring $str;
break;
}
}
?>
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