PHP的print函数，姑且说是函数吧啊。可以使用在PHP 4, PHP 5的环境中。
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print函数的作用就是输出一个字符串。使用方法：
int print ( string arg )
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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：）
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<?php
print(“Hello World”);
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print “print() also works without parentheses.”;
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print “This spans
multiple lines. The newlines will be
output as well”;
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print “This spans\\nmultiple lines. The newlines will be\\noutput as well.”;
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print “escaping characters is done \\”Like this\\”.”;
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// You can use variables inside of a print statement
foo = “foobar”;
bar = “barbaz”;
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print “foo is foo”; // foo is foobar
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// You can also use arrays
bar = array(“value” => “foo”);
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print “this is {bar[\'value\']} !”; // this is foo !
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// Using single quotes will print the variable name, not the value
print ‘foo is foo’; // foo is foo
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// If you are not using any other characters, you can just print variables
print foo; // foobar
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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;
?>
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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。
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