diff example

Implementation of DIFF in pure-php

this outputs the difference in gnu diff(1) syntax.
Input-Data: Array
(
    [0] => <html>
    [1] => <head><title>Text</title></head>
    [2] => <body>
    [3] => code a
    [4] => code b
    [5] => code c
    [6] => code d
    [7] => code e
    [8] => code g
    [9] => </body>
    [10] => </html>
)
Array
(
    [0] => <html>
    [1] => <head><title>Text2</title></head>
    [2] => <body>
    [3] => code a
    [4] => code a
    [5] => code c
    [6] => code d
    [7] => code e
    [8] => code g
    [9] => code f
    [10] => </body>
    [11] => </html>
)
new, old 
2c2
< Text
---
> Text2
5c5
< code b
---
> code a
9a10
> code f
old, new 
2c2
< Text2
---
> Text
5c5
< code a
---
> code b
10d9
< code f
Compared: array_diff( $f1_arr, $f2_arr );
 Array
(
    [1] => <head><title>Text</title></head>
    [4] => code b
)
Compared: array_diff( $f2_arr, $f1_arr );
 Array
(
    [1] => <head><title>Text2</title></head>
    [9] => code f
)