How to use a for loop in PHP to find the maximum value in an array.

You can use a for loop to loop through an array and find the maximum value. Here is an example code:

$numbers = array(10, 5, 8, 20, 15);
$max = $numbers[0]; // 假设数组的第一个元素为最大值

for ($i = 1; $i < count($numbers); $i++) {
    if ($numbers[$i] > $max) {
        $max = $numbers[$i];
    }
}

echo "数组的最大值为: " . $max;

In this example, we initially assume the first element of the array to be the maximum value. We then use a for loop to iterate through each element of the array, updating the maximum value if the current element is greater. Finally, we output the maximum value.