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

How to use for loop in php to find the maximum value in an array: 1. Create a php sample file; 2. Define an array "$arr", assuming that the first element is the maximum value, save In the "$max" variable; 3. Use a for loop to traverse the array. If the current element is larger than "$max", assign it to "$max"; 4. Echo outputs the final $max variable.

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

Use a for loop to traverse the array and find the maximum value. The specific implementation is as follows:

<?php
    // 定义一个数组
    $arr = array(3, 6, 8, 2, 9, 1);
    // 首先假设第一个元素为最大值
    $max = $arr[0];
    // 使用 for 循环遍历数组
    for ($i = 1; $i < count($arr); $i++) {
        // 如果当前元素大于$max，则将其赋值给$max
        if ($arr[$i] > $max) {
            $max = $arr[$i];
        }
    }
    // 输出最大值
    echo "数组中的最大值是：" . $max;
?>

Code execution results:

数组中的最大值是：9

In the above code, we first define an array `$arr`, and then initialize the variable `$max` with the first element. Then use a for loop to traverse the array. If the current element is larger than `$max`, assign it to `$max`. Finally, output `$max`.

It should be noted that when using the `count()` function in a for loop to obtain the array length, the loop variable `$i` should be traversed starting from 1, because the first element has been assigned to `$max`, no need to compare it with itself.

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