How to change all values ​​of PHP array to uppercase or lowercase

This article will introduce to you how to change all the values ​​​​in PHP arrays to uppercase or lowercase. I believe that after reading this article, you will have a better understanding of PHP arrays. I also hope that the problem-solving ideas involved in the article can It will help everyone use it in daily development~

First of all, I will give an example array $Color, as follows:

$Color = array('A' => 'Blue', 'B' => 'Green', 'c' => 'Red');

You can operate it locally and convert the value to Uppercase or lowercase.

The following is the implementation method I gave:

The complete PHP code is as follows:

 $value)
    {
        if (is_array($value))
        {
            $narray[$key] = array_change_value_case($value, $case);
            continue;
        }
        $narray[$key] = ($case == CASE_UPPER ? strtoupper($value) : strtolower($value));
    }
    return $narray;
}
$Color = array('A' => 'Blue', 'B' => 'Green', 'c' => 'Red');
echo '原始数组：';
var_dump($Color);
echo '值是小写的：';
$myColor = array_change_value_case($Color,CASE_LOWER);
var_dump($myColor);
echo '值是大写的：';
$myColor = array_change_value_case($Color,CASE_UPPER);
var_dump($myColor);

The results are as follows:

Isn’t it also very simple!

Here you need to know three functions:

1, is_array() Function: detect whether the variable is an array, the syntax is "is_array(mixed $var): bool", if var is an array, returns true, otherwise returns false.

2, strtoupper() Function: used to convert a string to uppercase. This function is binary safe, and its return value is the string converted to uppercase.

3, strtolower() Function: used to convert a string to lowercase. This function is binary safe, and its return value is the string converted to lowercase.

Attached related functions:

lcfirst(): Convert the first character in the string to lowercase

strtolower(): Convert the string To lowercase

ucfirst(): Convert the first character in the string to uppercase

ucwords(): Convert the first character of each word in the string to uppercase

Finally, I would like to recommend the latest and most comprehensive "PHP Video Tutorial" to everyone~ Come and learn!

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