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(PHP 4, PHP 5)
echo — Exibe uma ou mais strings
Exibe todos os parâmetros.
echo() não é uma função atualmente (construtor da linguagem) então não é obrigatório usar parênteses. echo() (diferente de outro construtor da linguagem) não se comporta como uma função, então ele nem sempre é usado no contexto de uma função. Sendo assim, se você quer passar mais de um parâmetro para echo(), os parâmetros não precisam estar entre parênteses.
echo() também tem um sintaxe curta, onde você pode imediatamente abrir a tag com o sinal de igual. Esta sintaxe curta funciona habilitando a definição da configuração short_open_tag.
I have <?=$foo?> foo.
O parâmetro a exibir.
Não há valor retornado.
Exemplo #1 echo() exemplos
<?php
echo "Hello World";
echo "This spans
multiple lines. The newlines will be
output as well";
echo "This spans\nmultiple lines. The newlines will be\noutput as well.";
echo "Escaping characters is done \"Like this\".";
// You can use variables inside of an echo statement
$foo = "foobar";
$bar = "barbaz";
echo "foo is $foo"; // foo is foobar
// You can also use arrays
$baz = array("value" => "foo");
echo "this is {$baz['value']} !"; // this is foo !
// Using single quotes will print the variable name, not the value
echo 'foo is $foo'; // foo is $foo
// If you are not using any other characters, you can just echo variables
echo $foo; // foobar
echo $foo,$bar; // foobarbarbaz
// Some people prefer passing multiple parameters to echo over concatenation.
echo 'This ', 'string ', 'was ', 'made ', 'with multiple parameters.', chr(10);
echo 'This ' . 'string ' . 'was ' . 'made ' . 'with concatenation.' . "\n";
echo <<<END
This uses the "here document" syntax to output
multiple lines with $variable interpolation. Note
that the here document terminator must appear on a
line with just a semicolon. no extra whitespace!
END;
// Because echo does not behave like a function, the following code is invalid.
($some_var) ? echo 'true' : echo 'false';
// However, the following examples will work:
($some_var) ? print 'true' : print 'false'; // print is also a construct, but
// it behaves like a function, so
// it may be used in this context.
echo $some_var ? 'true': 'false'; // changing the statement around
?>
Para uma 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
Nota: Este é um construtor de linguagem e não uma função, por isso não é possível chamá-lo através de funções variáveis
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