PHP echo

Note - single quotes expand variables, double ones do not

<?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
?>