Query string is part of an URI which is use to pass some
information in URL. Information pass by a query string can be used by server or
client by java script or any server side language. Query string is one most
powerful method to pass additional information about web processing application
but query string is not recommended to pass sensitive information because query
string put flat text which can be read by anyone.
Query string start with symbol? After URL followed by a name
and relevant value. More than one value can be passing with single query string.
Query string Variable name start with & symbol.
e.g
Reading query string
PHP has built in super global variable used for read a query
string variable value.
<?php
echo 'Hello ' . htmlspecialchars($_GET["name"]) . '!';
?>
echo 'Hello ' . htmlspecialchars($_GET["name"]) . '!';
?>
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