Count the number of lines in a text file

We can simply count and returns number of lines in a text file using file() and count()

$file = "testfile.txt";
$lines = count(file($file));
echo "There are $lines lines in $file";

count
Count all elements in an array, or something in an object

file
Returns the file in an array. Each element of the array corresponds to a line in the file, with the newline still attached.

Sources:

1) http://www.totallyphp.co.uk/code/count_the_number_of_lines_in_a_text_file.htm
2) http://php.net/manual/en/function.count.php

Get IP address and other Server information of the Visitor

echo "Visitor IP Address: ".$_SERVER['REMOTE_ADDR']."
";

echo "The address of the page (if any) which referred the user agent to the current page: ".$_SERVER['HTTP_REFERER']."
";

echo "The absolute pathname of the currently executing script : ".$_SERVER['SCRIPT_FILENAME']."
";

echo "The user agent being which is accessing the page : ".$_SERVER['HTTP_USER_AGENT']."
";

echo "The name of the server host : ".$_SERVER['SERVER_NAME']."
";

‘REMOTE_ADDR’
The IP address from which the user is viewing the current page

‘HTTP_REFERER’
The address of the page (if any) which referred the user agent to the current page. This is set by the user agent. Not all user agents will set this, and some provide the ability to modify HTTP_REFERER as a feature. In short, it cannot really be trusted.

‘SERVER_NAME’
The name of the server host under which the current script is executing. If the script is running on a virtual host, this will be the value defined for that virtual host.

‘HTTP_USER_AGENT’
Contents of the User-Agent: header from the current request, if there is one. This is a string denoting the user agent being which is accessing the page. A typical example is: Mozilla/4.5 [en] (X11; U; Linux 2.2.9 i586).

Source:
1) http://php.net/manual/en/reserved.variables.server.php

Count number of words in a text string

This will count through the sentences in a section of text and show how many words are contained within it.

$text = "This is some text.";
// used space to separate the words
$count = count(explode(" ", $text));
echo "$text contains $count words";

explode
Split a string by string
Returns an array of strings, each of which is a substring of string formed by splitting it on boundaries formed by the string delimiter.
count
Count all elements in an array, or something in an object

Source:
1) http://php.net/manual/en/function.explode.php
2) http://php.net/manual/en/function.count.php
3) http://www.totallyphp.co.uk/code/count_number_of_words_in_a_text_string.htm