PHP的print函数

print() 是一个语言结构而非函数，因此它无法被变量函数调用。 请看下面的演示：）

<?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 multiple lines. The newlines will be output as well.";

print "escaping characters is done \"Like this\".";

// You can use variables inside of 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;
?>

注意: 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。