Strange and Interesting facts about PHP

Comparison:
In PHP the boolean values TRUE and FALSE are case in-sensitive.

Example:
$a=TrUe;
if($a)

 echo 'Entered';     //will come
if($a==TRUE)
 echo 'Entered';    //will come
if($a===TRUE)
 echo 'Entered';   //will come

And TRUE = Something other than FALSE or 0 or '0'.

Example:
$a='test';
$b='0';
if($a==TRUE)
    echo 'Entered';   //will come
if($b==TRUE)
    echo 'Entered';   //will not come

Increment Operator:
If we use an increment operator along with a string, it will increment last letter of the string(When the last letter of the string is alpha numeric, that is other than special characters).

Example:
$a='apple3';
$b='apple';
$c='apple?';

echo ++$a;    // output: apple4
echo ++$b;   // output: applf
echo ++$c;   // output: apple?

Case Sensitive:
In PHP variables are case sensitive but functions are not.

Example:
$test='red';
echo $tesT;   // will not work
sample();      // will work

function Sample()
{
echo 'inside function';
}


Please go throw the following links for more details:
http://www.sitepoint.com/3-strange-php-facts-you-may-not-know/
http://php.net/manual/en/types.comparisons.php