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php filter_has_var determines whether a variable exists function_PHP tutorial

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Release： 2016-07-20 11:00:31
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Definition and usage
The filter_has_var() function checks if a variable of the specified input type exists.

Returns TRUE or FALSE on success on failure.

Grammar

filter_has_var(type, variable)
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	type
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  • 
	必需的。指定类型检查可能存在的输入类型：
	INPUT_GET
    • 
	
  • INPUT_POST
    • 
	
  • INPUT_COOKIE
    • 
	
  • INPUT_SERVER
    • 
	
  • INPUT_ENV
    • 
	

			
	

	

	variable
	
	必需的。指定变量检查
	
	







    

  • 
Required. Specify type checking for possible input types:
INPUT_GET
    • 

  • INPUT_POST
    • 

  • INPUT_COOKIE
    • 

  • INPUT_SERVER
    • 

  • INPUT_ENV
    • 







variable

Required. Specify variable check







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例如
在这个例子中的输入变量“名称”发送到PHP页面：
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<!--?phpif(!filter_has_var(INPUT_GET, "name")) { echo("Input type does not exist"); }else { echo("Input type exists"); }?-->
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输出为.
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 Input type exists
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www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/445506.htmlTechArticleDefinition and Usage The filter_has_var() function checks if a variable of the specified input type exists. Returns TRUE or FALSE on success on failure. Syntax filter_has_var(type, variable)...



                

            

            

                                

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