PHP Switch Using Regular Expression Regex
The PHP switch function is a useful tool as an alternative to long if/elseif/else statements. In this example, the switch function is used in conjuction with a regular expression to detirmine the program flow.
For more amazingness on the PHP switch function see http://phpswitch.com
<?php
/**
*
* Greeting based on name
*
* @access public
* @param string $string
* @return string
*
*/
function greeting( $string )
{
switch( $string )
{
// check if the string begins with John
case ( preg_match( '/John.*/', $string ) ? true : false ):
$ret = "Welcome John";
break;
// check if the string begins with Kev
case ( preg_match( '/Kev.*/', $string ) ? true : false ):
$ret = "G'day Kev";
break;
// check if the string begins with Per
case ( preg_match( '/Jome.*/', $string ) ? true : false ):
$ret = "Hej da, Per";
break;
// if there is no match, throw exception with error message
default: throw new Exception( "None shall pass" );
}
// return the value
return $ret;
}
Usage
<?php
// a string to test
$string = 'Kev is in the house';
// lets look for a greeting message
try
{
echo greeting( $string );
}
catch( Exception $e )
{
echo $e->getMessage();
}
?>