print

(PHP 4, PHP 5)

print — Affiche une chaîne de caractères

Description

int print ( string $arg )

print affiche la chaîne de caractères arg . print retourne toujours 1.

print() n'est pas vraiment une fonction (c'est techniquement une structure de langage). Cela fait que vous n'êtes pas obligé d'utiliser des parenthèses.

Exemple #1 Exemples avec print()


<?php
  print("Bonjour le monde");

  print "print() fonctionne aussi sans les parenthèses.";

  print "Ce print() se
répartit sur plusieurs lignes. Il affiche aussi les
nouvelles lignes";

  print "Ce print() se\nrépartit sur plusieurs lignes. Il affiche aussi les\nnouvelles lignes";

  print "L'échappement de caractères se fait : \"comme ceci\".";

// Vous pouvez utiliser des variables avec print
$foo = "foobar";
$bar = "barbaz";

print "foo vaut $foo"; // foo vaut foobar

// Vous pouvez aussi utiliser des tableaux
$bar = array("clé" => "foo");

print "c'est {$bar['clé']} !"; // c'est foo !

// Les guillemets simples annulent le remplacement des variables
print 'foo vaut $foo'; // foo vaut $foo

// Si vous n'utilisez pas d'autres caractères, vous 
// pouvez afficher simplement vos variables comme ceci
print $foo; // foobar

print <<<END
Cette syntaxe s'intitule le "here document" et 
permet d'afficher plusieurs lignes avec de 
l'interpolation de variables. Notez que la fin de
la syntaxe doit apparaître sur une nouvelle ligne,
avec uniquement un point-virgule, et pas d'espace
de plus !
END;
?>

Pour une brève discussion à propos des différences entre print() et echo(), consultez cet article des FAQTs Knowledge Base : » http://www.faqts.com/knowledge_base/view.phtml/aid/1/fid/40

Note: Comme ceci est une structure du langage, et non pas une fonction, il n'est pas possible de l'appeler avec les variables fonctions.

Voir aussi echo(), printf() et flush().

printf

parse_str

Last updated: Fri, 11 Apr 2008

add a note User Contributed Notes
print

jon
01-Jun-2007 07:19


the FAQTs article can be found archived at http://web.archive.org/web/20060601063513/http

://www.faqts.com/knowledge_base/view.phtml/aid/1/fid/40



(url split to get past the line-length limitation)

mvpetrovich
30-Mar-2007 12:02


I grew quite tired of backslashes, and wrote these routines. It uses the back single quote as a substitute for double quotes within a statement.  It made my code much more readable.  It is a little easier than using a "here document."  I also found I make a few less typing errors.



<?php



function qq($text) {return str_replace('`','"',$text); }

function printq($text) { print qq($text); }

function printqn($text) { print qq($text)."\n"; }



//example - before



echo "<a href=\"#\" class=\"stdbutton\" style=\"float:left;\" onclick=\"myfunction(); return false;\">My Link</a>\n";



//becomes - with printqn function



printqn("<a href=`#` class=`stdbutton` style=`float:left;` onclick=`myfunction(); return false;`>My Link</a>");



?>

floppie at quadra-tec dot net
15-Nov-2006 09:09


At the top of your page, do something to this effect:

<?php

    $n = "\n";

    $t = "\t";

?>



Then, if you need your table cell four tabs in:



<?php echo($t . $t . $t . $t . '<td>whatever</td>' . $n); ?>



This means the parser only has to interpret four characters inside double quotes, then just stores them in variables.  With strings that small, concatenating six things together won't be slow at all.

vincent at bevort dot com
21-May-2006 12:36


Sometime there is no choice in using a single or double quote

ie when using special chars to format the output to make the HTML more readable you have to use the Double qoutes. Single quotes make PHP fotmat the '\n' as text

phpnet at i3x171um dot com
20-May-2006 07:41


I have written a script to benchmark the several methods of outputting data in PHP: via single quotes, double quotes, heredoc, and printf. The script constructs a paragraph of text with each method. It performs this construction 10,000 times, then records how long it took. In total, it prints 160,000 times and records 16 timings. Here are the raw results.



Outputted straight to browser--



Single quotes: 2,813 ms

...with concatenation: 1,179 ms

Double quotes: 5,180 ms

...with concatenation: 3,937 ms

heredoc: 7,300 ms

...with concatenation: 6,288 ms

printf: 9,527 ms

...with concatenation: 8,564 ms



Outputted to the output buffer--



Single quotes: 8 ms

...with concatenation: 38 ms

Double quotes: 8 ms

...with concatenation: 47 ms

heredoc: 17 ms

...with concatenation: 49 ms

printf: 54 ms

...with concatenation: 52 ms



A nice graph of the script's output can be found here:

http://i3x171um.com/output_benchmarks/ob.gif



So what should you choose to print your text? I found several things out writing this.



First, it should be noted that the print and echo keywords are interchangeable, performance-wise. The timings show that one is probably an alias for the other. So use whichever you feel most comfortable with.



Second, if you've ever wondered which was better, the definitive answer is single quotes. Single quotes are at least four times faster in any situation. Double quotes, while more convenient, do pose a debatably significant performance issue when outputting massive amounts of data.



Third, stay away from heredoc, and absolutely stay away from [s]printf. They're slow, and the alternatives are there.



The source of my script can be found here:

http://i3x171um.com/output_benchmarks/ob.txt



DO NOT RUN THE SCRIPT ON THE INTERNET! Run it instead from localhost. The script outputs ~45 megabytes of text in an html comment at the top of the page by default. Expect the benchmark to take ~45 seconds. If this is too long, you can change the amount of iterations to a lower number (the results scale accurately down to about 1,000 iterations).

g8z at yahoo dot com
13-Mar-2006 11:16


I wanted to print a file on a Windows 2003 server from PHP, and found the "print" function instead. Just in case some other users are trying to physically print to a printer, rather than print to the screen, here's a function to do it.



This function will print a single file of one of these types: pdf, doc, xls, rtf, or plain text. If you have the full .exe path, you can print other document types, too. The shell_exec function is not enabled in safe mode.



Courtesy of Darren's Script Archive: http://www.tufat.com



<?php



function print_file($filename)

{

    // path to your adobe executable

    $adobe_path='"C:/Program Files/Adobe/Acrobat 7.0/Reader/AcroRd32.exe"';



    $ext='';

    $ext=strrchr($filename,'.');

    $ext=substr($ext,1);

    $ext_xl=substr($ext,0,2);



    if ($ext=='pdf') {

        shell_exec ($adobe_path.' /t '.$filename);

    }

    else if ($ext=='doc'||$ext=='rtf'||$ext=='txt') {

        $word = new COM("Word.Application");

        $word->visible = true;

        $word->Documents->Open($filename);

        $word->ActiveDocument->PrintOut();

        $word->ActiveDocument->Close();

        $word->Quit();

    }

    else if ($ext_xl=='xl') {

        $excel = new COM("Excel.Application");

        $excel->visible = true;

        $excel->Workbooks->Open($filename);

        $excel->ActiveWorkBook->PrintOut();

        $excel->ActiveWorkBook->Close();

        $excel->Quit();

    }

}



// example of printing a PDF



print_file("C:/photo_gallery.pdf");



?>

hw{�}cho.de
06-Feb-2006 08:05


@jon: you have to use "ob_flush()" before "flush()" - see notes there.

jon at tap dot net
05-Dec-2005 01:48


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.

james-web at and dot org
25-Jul-2005 03:47


Note that if you want to dump the value of a variable, you want to use print_r(), var_dump() or var_export().

ejallison at gmail dot com
16-Jul-2005 03:10


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.

gem at rellim dot com
05-Nov-2004 01:28


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

rjl at xs4all dot nl
15-Jan-2004 04:08


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 =<>=

add a note

printf

parse_str

Last updated: Fri, 11 Apr 2008