Replacing text within string that contains serialize arrays - php

Question

Thanks for clicking on the question. I am trying to find and replace text within a string that contains serialize arrays. For example :
'fgm2wc_options', 'a:19:{s:15:"automatic_empty";N;s:3:"url";s:25:"http://example.com/store/";s:8:"hostname";s:9:"localhost";s:4:"port";s:4:"3306";s:8:"database";s:22:"apgadmin_store_magento";s:8:"username" ... }
I want to change http://example.com/ to smth else I can do it with str_replace but it will not change the string length indicator ( e.g s:25 ).
This is a function i am using:
function recursive_unserialize_replace( $old_url = '', $new_url = '', $data = '', $serialised = false ) {
$new_url = rtrim( $new_url, '/' );
$data = explode( ', ', $data );
try {
if ( is_string( $data ) && ( $unserialized = #unserialize( $data ) ) !== false ) {
$data = recursive_unserialize_replace( $old_url, $new_url, $unserialized, true );
} elseif ( is_array( $data ) ) {
$_tmp = array( );
foreach ( $data as $key => $value ) {
$_tmp[ $key ] = recursive_unserialize_replace( $old_url, $new_url, $value );
}
$data = $_tmp;
unset( $_tmp );
} else {
if ( is_string( $data ) ) {
$data = str_replace( $old_url, $new_url, $data );
}
}
if ( $serialised ) {
return serialize( $data );
}
} catch( Exception $error ) {
}
return $data;
}
Any ideas ?

Answer 1

For anyone interested this is the solution i came up with:
function unserialize_replace( $old_url = '', $new_url = '', $database_string = '' ) {
if ( substr( $old_url, -1 ) !== '/' ) {
$new_url = rtrim( $new_url, '/' );
}
$serialized_arrays = preg_match_all( "/a:\d+:.*\;\}+/", $database_string, $matches );
if( !empty( $serialized_arrays ) && is_array( $matches ) ) {
foreach ( $matches[ 0 ] as $match ) {
$unserialized = #unserialize( $match );
if ( $unserialized ) {
$buffer = str_replace( $old_url, $new_url, $unserialized );
$buffer = serialize( $buffer );
$database_string = str_replace( $match, $buffer, $database_string );
}
}
}
if ( is_string( $database_string ) ) {
$database_string = str_replace( $old_url, $new_url, $database_string );
}
return $database_string;
}
Thanks for the suggestions. Please let me know if you see anything wrong and anything i can improve