众所周知,PHP自身内置了很多函数,这也是使用PHP能够极大提高开发效率的一个重要原因,获取数组中一元素的位置有很多方法,其中PHP自身就已经内置了一个函数array_keys(),下边的代码能够打印出所有PHP的内置函数:
print_r(get_defined_functions());
?>
array_keys的语法如下:
array_keys(array,value,[strict])
其中strict设置为true将触发数据类型校验的严格匹配模式,默认为false,下边的代码展示了array_keys的一个简单应用。
$test=array(10,20,30,"10","20","30");
print_r(array_keys($test,"10",true));//严格匹配模式
//输出:
//Array ( [0] => 3)
?>

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mPDF
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