Replace a line of code in a php file using php

To replace the below line of code in the testreplace.php

define(‘PATH_CURRENT_SITE’, ‘/mydoubts/’);

this should be changing to

define(‘PATH_CURRENT_SITE’, ‘/vasanthan/’);

For this please execute the stringreplace.php… changes will reflect in the testreplace.php

#File-stringreplace.php

<?php

$newstring="vasanthan";
$mystring="define('PATH_CURRENT_SITE', '/mydoubts/');";
$toFind = "/";
$start = 0;
$firstpos = strpos($mystring,$toFind,$start);
$start_pos=$firstpos+1;
$start=$firstpos+1;
$secondpos=strpos($mystring,$toFind,$start);
$end_pos=$secondpos-1;
$length=$end_pos-$start_pos+1;
$convertedstring=substr_replace($mystring,$newstring,$start_pos,$length);


$Filename_to_change = 'testreplace.php';
$new_string = $convertedstring;
$string_to_replace	=	$mystring;

 

    if(file_exists($Filename_to_change)) {
 
        $File_content = file_get_contents($Filename_to_change);
 
        // Replace the text
        $Value_after_replace = str_replace($string_to_replace, $new_string, $File_content);
 
        // Open the file
        $File_open_for_write = fopen($Filename_to_change, 'w+');
 
        // Write the text into it
        $File_write = fwrite($File_open_for_write, $Value_after_replace);
 
        if($File_write) {
 
            // If success, close file and return true
            fclose($File_open_for_write);
            return true;
 
        }
 
        // If failure, close file and return false
        fclose($File_open_for_write);
        return false;
 
    }
 
    else {
 
        die('File' . $Filename_to_change . 'does not exist!');
 
    }


?>

<?php

$newstring="vasanthan";

$mystring="define('PATH_CURRENT_SITE', '/mydoubts/');";

$toFind = "/";

$start = 0;

$firstpos = strpos($mystring,$toFind,$start);

$start_pos=$firstpos+1;

$start=$firstpos+1;

$secondpos=strpos($mystring,$toFind,$start);

$end_pos=$secondpos-1;

$length=$end_pos-$start_pos+1;

$convertedstring=substr_replace($mystring,$newstring,$start_pos,$length);

$Filename_to_change = 'testreplace.php';

$new_string = $convertedstring;

$string_to_replace = $mystring;

if(file_exists($Filename_to_change)) {

$File_content = file_get_contents($Filename_to_change);

// Replace the text

$Value_after_replace = str_replace($string_to_replace, $new_string, $File_content);

// Open the file

$File_open_for_write = fopen($Filename_to_change, 'w+');

// Write the text into it

$File_write = fwrite($File_open_for_write, $Value_after_replace);

if($File_write) {

// If success, close file and return true

fclose($File_open_for_write);

return true;

}

// If failure, close file and return false

fclose($File_open_for_write);

return false;

}

else {

die('File' . $Filename_to_change . 'does not exist!');

}

2.#File-testreplace.php

<?php
define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', false);
define('DOMAIN_CURRENT_SITE', 'mydoubts.in');
define('PATH_CURRENT_SITE', '/mydoubts/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1); 
?>

<?php

define('MULTISITE', true);

define('SUBDOMAIN_INSTALL', false);

define('DOMAIN_CURRENT_SITE', 'mydoubts.in');

define('PATH_CURRENT_SITE', '/mydoubts/');

define('SITE_ID_CURRENT_SITE', 1);

define('BLOG_ID_CURRENT_SITE', 1);