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Problem with HTML + PHP(print-on-screen commands), codes are appearing on screen rather then printed texts

<?php
echo "Hello World"."
"."Calvin";
?>

Result:
."
"."Calvin";

Method Tried:
Changing the codes, similar problem
Using other programming such as JavaScript and HTML, works

My assignment is to create a simple website for a business with online payment.

i am making the invador game and i want to move the shooter by mouse touch in html5 but i cant here is my code
shooter1.mousemove = shooter1.touchmove = function(data)
{
if(this.dragging)
{
// need to get parent coords..
var newPosition = this.data.getLocalPosition(this.parent);
shooter1.style.x = newPosition.x;
shooter1.style.y = newPosition.y;
}
}

I am an AIX system administrator at a client site for about 3 weeks now. They have a client in need to install new PHP version 5.3.9 on Linux server from version 5.1.2. I have never worked with PHP and need help with the installation. Please help. Thank you.

1. (a) Create a file containing the following car numbers, number of miles driven, and number of gallons of gas used by each car:
Car No. Miles Driven Gallons Used
54 250 19
62 525 38
71 123 6
85 1322 86
97 235 14
(b) Write a Java program that reads the data in the file created and displays the car number, miles driven, gallons used, and the miles per gallon for each car. The output should additionally contain the total miles driven, total gallons used, and average miles per gallon for all the cars. These totals should be displayed at the end of the output report.

which PHP-HTML codes can I use to submit(FirstName,LastName and Ages) ,and displaying the entered data. if the age entered or displayed is < 18 display that " you' re kid", > 18 and <35 display that "You're mature", > 35 dispay that "you're old!!!"

which PHP-HTML codes can I use to submit(FirstName,LastName and Ages) ,and displaying the entered data. if the age entered or displayed is < 18 display that " you' re kid"
> 18 and <35 display that "You're matur"
> 35 dispay that "you're old!!!"

What regex code do i need to match " title: "Some text" " in some hmtl.
I tried var title = entries.content.match(/title=\"([^\"]*)/);
but (/title=\"([^\"]*)/) is incorrect and does not find "Some text" which is in double quotes.