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php函数指定默认值方法的小例子

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Release: 2016-06-13 10:18:31
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本节内容:
php函数指定默认值
在php编程中,为自定义函数设定默认值,当用户调用该函数时,如果不给参数指定值,参数会用默认值顶替。
例1,

复制代码 代码如下:




php函数指定默认值-www.jb51.net


function printMe($param = NULL)
{
   print $param;
}
printMe("This is test");
printMe();
?>


输出结果:
This is test
例2,php函数参数默认值的使用范例,php函数参数中设置和使用默认值。
代码:

复制代码 代码如下:



 


  php函数参数默认值 - www.jb51.net
 
 
    function textonweb ($content, $fontsize=3){
     echo "$content";
  }
  textonweb ("A
", 7);
  textonweb ("AA.
");
  textonweb ("AAA.
");
  textonweb ("AAAA!
");
  ?>
 
 
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