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"options"=>array是什么 意思

WBOY
WBOYOriginal
2016-06-23 14:01:151371browse

代码如下

<?php$var=300;$int_options = array("options"=>array ( "min_range"=>0, "max_range"=>256 ));if(!filter_var($var, FILTER_VALIDATE_INT, $int_options)) { echo("Integer is not valid"); }else { echo("Integer is valid"); }?>


回复讨论(解决方案)

$int_options = array(	"options"=>array	(		"min_range"=>0,		"max_range"=>256		)	);

php数组的定义
=> 是数组成员访问符号 键名为options,值为array("min_range"=>0,"max_range"=>256) ...

filter_var 是一个过滤器函数,由第二个参数指定过滤器类型,第三个参数指定过滤器所需参数
当有多个参数时,就要用二维数组表示了

filter_var($var, FILTER_VALIDATE_INT, $int_options)
FILTER_VALIDATE_INT 表示是一个整数范围过滤器
既然是范围,自然要给出下限(min_range)和上限(max_range)了

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