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print

(PHP 4, PHP 5, PHP 7, PHP 8)

printMostra uma string

Descrição

print(string $arg): int

Mostra arg.

print na verdade não é uma função real (ela é uma construção da linguagem), dessa forma você não precisa usar parênteses com sua lista de argumentos.

As principais diferenças para echo são que print aceita apenas um único argumento e sempre retorna 1

Parâmetros

arg

O dado de entrada.

Valor Retornado

Retorna 1, sempre.

Exemplos

Exemplo #1 Exemplos print

<?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 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;
?>

Notas

Nota: Como esta é uma construção da linguagem e não uma função, ela não pode ser chamada usando funções variáveis ou argumentos nomeados.

Veja Também

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User Contributed Notes 2 notes

up
29
user at example dot net
14 years ago
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
   
}
?>
up
14
danielxmorris @ gmail dotcom
15 years ago
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
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