ch-2 Output



There are mainly two language construct available in php for print:
a.   echo
b.   print
Pay attention here, echo and print is a language construct not a function.  Because print and echo no need to follow with brackets. Eg.  
echo :-

<?php
echo “hello World”;
?>

This Program simply print:

hello World

print:
You may also use print function in php to print same statement “hello world” like:

<?php
print “hello World”;
?>

This Program code also  simply print:

hello World

In both statement if you don’t use parenthesis, then it will show error ,

But if there you want to print single word like “hello”  only then it is allow, it means only single word without double quotes(“ ”)is allowed , or can say that “white space “ is not allowed without double quotes(“ ”).
eg.

print hello;
O/p->hello

Cannot use white space
print hello world;

You saw in uppercase both (print and echo) function works or print same thing, but  both function echo and print have some technical difference , for ex.








print
echo
Print return 1 integer eg.
 $a=print “hello”;
echo $a;

O/P-> hello 1
echo return void eg.
$a=echo “hello”;
echo $a;

O/p- error
Words separate with comma is not work.eg.

print  “hello”,”world”;
O/p->  error
But, echo is work in sepration(,) eg.

echo  “hello”,”world”;
O/p-> helloworld

echo also work in separation by (,)here by without double quotes(“ ”) eg.

echo  hello, world;
O/p->helloworld
print is slow  then echo
echo is slightly faster than print


print command also has a short syntax like:
<?  ="hello world";  ?>
This statement also print hello world.
printf():

printf is a function , used for print argument. This is always followed by braces () .

if you have only one argument to print then , no need double quotes(“ “) around argument for eg.

<?php printf(hello); ?>

But if you have more than one argument to print, you need to put double quotes(“ “) around the argument. for eg.

<?php printf(“hello world”); ?>





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