$main_string="This is a test string <a href=http://www.plus2net.com>with a link</a> to plus2net";
if(stristr($main_string,"http://")){
echo "String contains a link or the text http:// inside it ";}
else {
echo "String does not contains a link or the text http:// inside it ";}

iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE
iptables -A FORWARD -i tun0 -s 10.8.0.0/24 -o eth0 -j ACCEPT
iptables -A FORWARD -i eth0 -o tun0 -m state –state ESTABLISHED,RELATED -j ACCEPT
echo 1 > /proc/sys/net/ipv4/ip_forward

<?php

$date = "25-12-2010";//[something in US format: mm-dd-yy]
$newdate = substr($date,6,4) . "-" . substr($date,3,2) . "-" . substr($date,0,2);

print "\n=====\n".$newdate."\n===============\n";

?>

<?php
echo strrev("Hello world!"); // outputs "!dlrow olleH"
?>

SELECT * FROM 'table' WHERE `name` REGEXP '\r'
UPDATE 'table' SET 'field' = REPLACE(FIELD,"findvalue", "reaplcevalue") WHERE REGEXP 'regexp search expression'

mysql_query("SET NAMES 'utf8' COLLATE 'utf8_slovenian_ci'");
mysql_query("SET CHARACTER SET 'utf8';");

<?php
$db = mysql_connect("localhost", "username", "pass");
if(!$db) echo "Cannot connect to the database - incorrect details";
mysql_select_db('myuser_mydbname'); $result=mysql_query('show tables');
while($tables = mysql_fetch_array($result)) {
foreach ($tables as $key => $value) {
mysql_query("ALTER TABLE $value COLLATE utf8_slovenian_ci");
}}
echo "The collation of your database has been successfully changed!";
?>

$string = iconv("CP1250", "UTF-8", $string);