How to convert an array to uppercase in php

php method to convert an array to uppercase: 1. Create a PHP sample file; 2. Define an associative array; 3. Use the foreach statement to traverse the array; 4. Use the strtoupper function to convert the array elements to uppercase. .

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

php How to convert an array to uppercase?

How to change the key value to uppercase in PHP associative array

We have such an array:

$fruits = array('A' => 'Apple', 'B' => 'Banana', 'c' => 'Cherry', 'o' => 'Orange');

We convert all the array element values ​​​​in it to uppercase:

 $value){
    $fruits[$key]=strtoupper($value);
}
echo "转换为大写后：";
var_dump($fruits);
?>

Use the foreach statement to traverse the $fruits array, and use the strtoupper($value) function in the loop to convert the array element $value to uppercase, so the output result is:

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