How to use for loop in php to find the maximum value of an array

Steps: 1. Use array_values() to convert the array into an index array; 2. Define a variable to store the maximum value, with the syntax "$m=$arr[0];"; 3. Use for The statement traverses the array with the syntax "for($i=0;$i$m){$m=$arr[$i];}".

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

In php, you can pass In the for loop, $max is constantly compared with each value of the array ($arr[$i]); if it is greater than $max, just assign the element to $max.

Implementation steps:

Step 1: Use the array_values() function to convert the array into an index array

The array_values() function is to return the values ​​of all elements in the array. It is very simple to use. With only one required parameter $array, it can return an array containing all the values ​​​​in the given array, but the key name is not retained. . The returned array will be in the form of an indexed array, with array indices starting at 0 and increasing by 1.

array_values($array)

Step 2: Define a variable $max to store the maximum value

$max = $arr[0];

Step 3: Use the for statement to traverse the array

for ($i = 0;$i< 数组长度;$i++){//循环数组
    //循环体语句块;
}

Step 4: In the loop body, continuously compare $max with each value of the array ($arr[$i]). If it is greater than $max, assign the element to $max

• If $arr[$i] is greater than $max, assign the $max value to $secMax and $arr[$i] to $max,

if ($arr[$i] > $max){
    $max = $arr[$i];
}

By continuing to compare like this, you can ensure that $max stores the maximum value of the array.

Implementation example code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);
function takeNum($array){
	$arr=array_values($array);
	
	//定义了1个变量$max来存放最大值
    $max = $arr[0];
	for ($i = 0;$i< count($arr);$i++){//循环数组
	
		if ($arr[$i] > $max) {
			$max = $arr[$i];
		}
	}
		echo "最大值为".$max;
}


$array = array(1=>"1","a"=>"5",2=>"3","b"=>0,"c"=>"4");
var_dump($array);
takeNum($array);
?>

Test it:

defines the following array, call the takeNum($array) function to see the output

$array = array(0,5,1,429,18,21,52,2,52,9,3,"5");
var_dump($array);
takeNum($array);

Definition For the following array, call the takeNum($array) function to see the output

$array = array(1=>"1","a"=>"5",2=>"3","b"=>0,"c"=>"4");
var_dump($array);
takeNum($array);

Recommended learning: "PHP Video Tutorial"

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