echo

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. echo() (unlike some other language constructs) does not behave like a function, so it cannot always be used in the context of a function. Additionally, if you want to pass more than one parameter to echo() , the parameters must not be enclosed 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\"." ; // 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 $bar = array( "value" => "foo" ); echo "this is { $bar [ '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 ?>

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

See also print() , printf() , and flush() .