Description
void
echo ( string arg1 [, string ...] )
Outputs all parameters.
echo() is not actually a function (it is a
language construct) so you are not required to use parentheses
with it. In fact, if you want to pass more than one parameter
to echo, you must not enclose the parameters within parentheses.
例子 1. echo() examples
<?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\".";
$foo = "foobar";
$bar = "barbaz";
echo "foo is $foo"; $bar = array("value" => "foo");
echo "this is {$bar['value']} !"; echo 'foo is $foo'; echo $foo; echo $foo,$bar; 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 $variable interpolation. Note
that the here document terminator must appear on a
line with just a semicolon. no extra whitespace!
END;
($some_var) ? echo 'true' : echo 'false';
($some_var) ? print('true'): print('false'); echo $some_var ? 'true': 'false'; ?>
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echo() also has a shortcut syntax, where you can
immediately follow the opening tag with an equals sign. This short syntax
only works with the short_open_tag configuration setting
enabled.
For a short discussion about the differences between
print() and echo(), see this FAQTs
Knowledge Base Article: http://www.faqts.com/knowledge_base/view.phtml/aid/1/fid/40
注: 由于这是一个语言结构而非函数,因此它无法被“变量函数”调用。
See also
print(),
printf(), and
flush().