Advanced explanation of php functions-PHP Tutorial-php.cn

Advanced explanation of php functions

小云云

Release： 2023-03-22 13:20:02

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Use variables to store function names, and write them in the form of variables () when calling. This article mainly shares with you the advanced explanation of PHP functions, I hope it can help you.

Applicable situations:

Used when calling different functions according to the type of user feedback information.
Example:

$funf = &#39;test&#39;;
$funf();

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Internal function call function external variable

Use usekeyword

Example

function test(){
    $msg = "I&#39;m message.";
    // 使用use关键字，获取变量
    $say = function($str) use(&$msg){
        echo $msg;  
        echo &#39;<hr/>&#39;;     
        echo $str;
    };
    $say(&#39;Hello World&#39;);
}
test();

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Bubble sort

The so-called bubble sort is to throw the array parameters from small to large or from large to small.

Example:

// 从小到大例子
//定义一个数组
$arr = [1,3,2,10,8,7,9];
// 冒泡排序主函数
function sortArr($arr){
    // 进行外层遍历，其实就是规定循环多少次
    for($i=0; $i<count($arr); $i++) {
        // 从第i+1个参数开始遍历，同样遍历那么多次
        for ($j=$i+1; $j<count($arr); $j++) {
            // 比较内外层的数
            if($arr[$i] > $arr[$j]){
                // 内层的值赋值给临时变量
                $temp = $arr[$j];
                // 交换位置
                $arr[$j] = $arr[$i];
                // 再从临时变量中赋值回来
                $arr[$i] = $temp;
            }
        }
    }
  // 返回排序后的数组
  return $arr;
}
print_r(sortArr($arr));

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Reference materials:

Related recommendations:

Advanced learning of JavaScript functions Detailed explanation of advanced function example code

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