parse_str
An update to the println function I wrote below, this is a more efficient, correct and returns a value (1, always; (print)).
<?php
function println($string_message = '') {
return isset($_SERVER['SERVER_PROTOCOL']) ? print "$string_message<br />" . PHP_EOL:
print $string_message . PHP_EOL;
}
?>
(PHP 4, PHP 5)
print — Mostra uma string
Descrição
int print
( string $arg
)
Mostra arg .
print() não é atualmente uma função real (é uma construção da linguagem) então você não precisa usar parênteses com ela.
Para um pequena discussão sobre a diferença entre print() e echo(), veja este FAQTs Knowledge Base Article: » http://www.faqts.com/knowledge_base/view.phtml/aid/1/fid/40
Parâmetros
- arg
-
A string de entrada.
Valor Retornado
Retorna sempre 1.
Exemplos
Exemplo #1 Exemplos print()
<?php
print("Alô Mundo");
print "print() também funciona sem parênteses.";
print "Isto divide
em múltiplas linhas. As quebras de linha serão
mostradas também";
print "Isto divide\nem múltiplas linhas. As quebras de linha serão\nmostradas também";
print "escapar caracteres é feito \"como isto\".";
// Você pode usar variáveis dentro do
$foo = "foobar";
$bar = "barbaz";
print "foo is $foo"; // foo is foobar
// Você pode usar arrays
$bar = array("value" => "foo");
print "this is {$bar['value']} !"; // this is foo !
// Usando apóstrofos irá exibir o nome da variável, não o valor
print 'foo is $foo'; // foo is $foo
// Se você não estiver usando outros caracteres, somente mostre a variável
print $foo; // foobar
print <<<END
Isto usa a sintaxe "aqui documento" para mostrar
múltiplas linhas com interpolação de $variable interpolation. Note
que o terminador de aqui documento deve aparecer
em uma linha terminada em ponto e vírgula(;) sem nenhum espaço extra!
END;
?>
Notas
Nota: Este é um construtor de linguagem e não uma função, por isso não é possível chamá-lo através de funções variáveis
add a note
User Contributed Notes
http://www.danielxmorris.com
28-Aug-2008 05:46
28-Aug-2008 05:46
user at example dot net
25-Aug-2008 07:47
25-Aug-2008 07:47
Be careful when using print. Since print is a language construct and not a function, the parentheses around the argument is not required.
In fact, using parentheses can cause confusion with the syntax of a function and SHOULD be omited.
Most would expect the following behavior:
<?php
if (print("foo") && print("bar")) {
// "foo" and "bar" have been printed
}
?>
But since the parenthesis around the argument are not required, they are interpretet as part of the argument.
This means that the argument of the first print is
("foo") && print("bar")
and the argument of the second print is just
("bar")
For the expected behavior of the first example, you need to write:
<?php
if ((print "foo") && (print "bar")) {
// "foo" and "bar" have been printed
}
?>
user at example dot net
25-Aug-2008 07:45
25-Aug-2008 07:45
Be careful when using print. Since print is a language construct and not a function, the parentheses around the argument is not required.
In fact, using parentheses can cause confusion with the syntax of a function and SHOULD be omited.
Most would expect the following behavior:
<?php
if (print("foo") && print("bar")) {
// "foo" and "bar" had been printed
}
?>
But since the parenthesis around the argument are not required, they are interpretet as part of the argument.
This means that the argument of the first print is
("foo") && print("bar")
and the argument of the second print is just
("bar")
For the expected behavior of the first example, you need to write:
<?php
if ((print "foo") && (print "bar")) {
// "foo" and "bar" had been printed
}
?>
danielxmorris @ gmail dotcom
16-May-2008 02:08
16-May-2008 02:08
I wrote a println function that determines whether a \n or a <br /> should be appended to the line depending on whether it's being executed in a shell or a browser window. People have probably thought of this before but I thought I'd post it anyway - it may help a couple of people.
<?php
function println ($string_message) {
$_SERVER['SERVER_PROTOCOL'] ? print "$string_message<br />" : print "$string_message\n";
}
?>
Examples:
Running in a browser:
<?php println ("Hello, world!"); ?>
Output: Hello, world!<br />
Running in a shell:
<?php println ("Hello, world!"); ?>
Output: Hello, world!\n
jon
01-Jun-2007 05:19
01-Jun-2007 05:19
the FAQTs article can be found archived at http://web.archive.org/web/20060601063513/http
://www.faqts.com/knowledge_base/view.phtml/aid/1/fid/40
(url split to get past the line-length limitation)
mvpetrovich
30-Mar-2007 10:02
30-Mar-2007 10:02
I grew quite tired of backslashes, and wrote these routines. It uses the back single quote as a substitute for double quotes within a statement. It made my code much more readable. It is a little easier than using a "here document." I also found I make a few less typing errors.
<?php
function qq($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 07:09
15-Nov-2006 07:09
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 10:36
21-May-2006 10:36
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
21-May-2006 05:41
21-May-2006 05:41
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
14-Mar-2006 09:16
14-Mar-2006 09:16
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();
$excel->Quit();
}
}
// example of printing a PDF
print_file("C:/photo_gallery.pdf");
?>
jon at tap dot net
05-Dec-2005 11:48
05-Dec-2005 11:48
I have a small utility run from the command line that processes a potentially huge list of files. As it can take hours to complete, I stuck a
print '.';
statement in the body of the main loop to prove that something was happening.
For reasons unknown to me, the utiliity suddenly started buffering the output such that it printed nothing until completion, defeating the purpose of the running monitor. Adding flush() statements did nothing. The problem was solved by using
fputs(STDOUT, '.');
but I have no idea why.
james-web at and dot org
26-Jul-2005 01:47
26-Jul-2005 01:47
Note that if you want to dump the value of a variable, you want to use print_r(), var_dump() or var_export().
ejallison at gmail dot com
17-Jul-2005 01:10
17-Jul-2005 01:10
This is a simple function for printing debug comments that I didn't think of for a long time. Maybe it'll serve you good too.
<?php
function printd($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 11:28
05-Nov-2004 11:28
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
16-Jan-2004 02:08
16-Jan-2004 02:08
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 =<>=