Do you know the difference between the common echo() and print() functions? Also you will find here a basic description of variable functions in PHP.
Ok, this is a basic tutorial to help people just getting started with PHP. In
this tutorial I will show you how to output to the webpage. We will use two
forms of outputting:
print() and
echo().
First things first: all newcomers to PHP will be happy to know that PHP code can
be written or added directly to your HTML!! All you have to do is put it between
the
<?php and
?> tags.
<?php
php stuff
?>
Ok, now that said, let's go to what this tutorial was written for.
The first outputting function I will show you is
print().
This is very easy to use, and in fact, the parentheses are not even necessary.
The basic structure of
print() is:
<?php
print("This is outputted to the webpage");
print "so is this!";
?>
You can also declare variables and then output them using the print
function:
<?php
$hello = "hello"
print("$hello"); //this print the hello variable
print "$hello";
?>
That's really all there is to it. One thing is that it cannot be used in
a variable function, which I'll explain in a few minutes.
The next method of outputting to a webpage is the
echo() function. It is
used the same way as
print().
<?php
$kool = "this is kool";
echo ("$kool prints \"kool\"");
echo "this does too!";
echo("hello");
echo "this prints \"hello\" too!";
?>
What's the difference between the two ? Well, one difference is that
echo() can take multiple expressions:
<?php
echo "The first", "the second";
?>
Print cannot take multiple expressions. That is the main distinct
difference!
So there, you now have 2 ways of outputting text or variables to the webpage,
but what about that variable function you ask ? Well, variables functions are
things that don't work with
echo() and
print(). It basically means
that if you were to put the name of a function inside a statement, it would try
to execute the function.
It is a very confusing concept, even for me, so visit
the php manual on variable funtions for more info. Here is some example code
that may help you understand variable functions:
<?php function foo()
{
echo "In foo()\n";
}
function bar($arg = '')
{
echo "In bar(); argument was '$arg'.\n";
}
$func = 'foo';
$func();
$func = 'bar';
$func('test');
?>
In the code above there are two simple functions are declared. Then their
names are assigned to the variable and both functions are executed using this
variable.
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PHP Introduction to PHP Echo and print Tutorial
Ok, this is a basic
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forms of outputting:
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First....
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<?
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