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1 
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 check what browser the user is accessing your web server  
<?php
    echo $_SERVER['HTTP_USER_AGENT'];
?>
 		 CCBot/1.0 (+http://www.commoncrawl.org/bot.html)      
2 
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 closing tag ?> can be omitted  
<?php echo 'We omitted the last closing tag';
 		 We omitted the last closing tag     
3 
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 Three types of comments  
<?php
    // This is a one-line c++ style comment
    /* This is a multi line comment
       yet another line of comment */
    echo 'A Test'; # A shell-style comment
 		 A Test     
4 
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 2 scalar types  
<?php
   // 4 scalar types:
   // 1. boolean:
   $bar = true; 
   echo "a boolean bar == " . $bar . "<br>";

   // 2. integer:
   $anInt = 8; 
   echo "anInt == " . $anInt . "<br>";

   // 3. float:
   $aFloat = 3.14159; 
   echo "aFloat scalar == " . $aFloat . "<br>";

   // 4. string:
   $aString = "Hello World"; 
   echo "aString scalar == " . $aString . "<br>";
 		 a boolean bar == 1
anInt == 8
aFloat scalar == 3.14159
aString scalar == Hello World
  		   
5 
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 2 compound types  
<?php

// 1. array:

$arr = array("foo" => "bar", 12 => true);

echo "arr[foo] == " . $arr["foo"] . "<br>"; // bar
echo "arr[12] == " . $arr[12] . "<br>";    // 1
print_r($arr);

// 2. object type:
class foo
{
    function do_foo()
    {
        echo "Doing foo. <br>"; 
    }
}

$bar = new foo;
$bar->do_foo();
print_r($bar);
print("<br>");
var_dump($bar);
 		 arr[foo] == bar
arr[12] == 1
Array ( [foo] => bar [12] => 1 ) Doing foo.
foo Object ( )
object(foo)#140 (0) { }   		   

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