PHP: print - Manual

Description

int print ( string arg )

Outputs arg. Returns 1, always.

print() is not actually a real function (it is a language construct) so you are not required to use parentheses with its argument list.

Przykład 1. print() examples


<?php

print("Hello World");



print "print() also works without parentheses.";



print "This spans

multiple lines. The newlines will be 

output as well";



print "This spans\nmultiple lines. The newlines will be\noutput as well.";



print "escaping characters is done \"Like this\".";



// You can use variables inside of a print statement

$foo = "foobar";

$bar = "barbaz";



print "foo is $foo"; // foo is foobar



// You can also use arrays

$bar = array("value" => "foo");



print "this is {$bar['value']} !"; // this is foo !



// Using single quotes will print the variable name, not the value

print 'foo is $foo'; // foo is $foo



// If you are not using any other characters, you can just print variables

print $foo;          // foobar



print <<<END

This uses the "here document" syntax to output

multiple lines with $variable interpolation. Note

that the here document terminator must appear on a

line with just a semicolon no extra whitespace!

END;

?>

For a short discussion about the differences between print() and echo(), see this FAQTs Knowledge Base Article: http://www.faqts.com/knowledge_base/view.phtml/aid/1/fid/40

Notatka: Ponieważ jest to element składni języka a nie funkcja, nie może być on wywoływany używając zmiennych funkcji

See also echo(), printf(), and flush().

User Contributed Notes


I have a small utility run from the command line that processes a potentially huge list of files. As it can take hours to complete, I stuck a  



print '.';



statement in the body of the main loop to prove that something was  happening.



For reasons unknown to me, the utiliity suddenly started buffering the output such that it printed nothing until completion, defeating the purpose of the running monitor. Adding flush() statements did nothing. The problem was solved by using



fputs(STDOUT, '.');



but I have no idea why.


This is a simple function for printing debug comments that I didn't think of for a long time. Maybe it'll serve you good too.



<?php



function printd($str) {

  if ($debug) { echo $str; }

}



// ...



if ($valueCalculatedEarlierInTheScript == 3) {

  doSomethingWithNoOutput();

  printd("doSomethingWithNoOutput() has executed.");

}



?>



It's mostly just to make sure everything is running without having to go through everything and put in echo "Step #whatever has executed" whenever something mysterious isn't working.


HERE Documents can reference arrays as long as you enclose


the vars in {}.





Like this:





<?php





$line = array( 'title' => "Hello", 'date' => 'Today');





echo <<<EOT


Title: {$line['title']}


Date: {$line['date']}


EOT;




?>





Run this and get


Title: Hello


Date: Today





More info here, scroll down to "heredoc syntax":


http://www.php.net/manual/en/language.types.string.php


To elaborate on above example adding an


array variable


$text = <<<END


This uses the "here document" syntax to output


multiple lines with $variable interpolation. Note


that the here document terminator must appear on a


line with just a semicolon no extra whitespace!


User = {$_REQUEST['user']}


END;





'print $text;' Will output the string. Very handy for storing HTML.


Or adding {} around the array will allow you to use


above mentioned html blocks in conjuction with forms.





Rene =<>=