print

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

print — Mostra 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

echo - Exibe uma ou mais strings
printf() - Mostra uma string formatada
flush() - Descarrega o buffer de saída
Sintaxe Heredoc

＋add a note

User Contributed Notes 2 notes

down

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
    }
?>

down

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

＋add a note