How can I use the array_keys function to get an array of keys from an associative array in PHP? Example code:

Listen

$person = array(
    "name" => "John Doe",
    "age" => 30,
    "email" => "[email protected]"
);

$keys = array_keys($person);

print_r($keys);

How can I validate a form using PHP? Example code

How can I use the array_diff function to get the elements in one array that are not in another array in PHP? Example code:

How can I convert a string to uppercase in PHP? Example code:

How can I format a date in PHP? Example code:

How can I use an if-else statement in PHP? Example code:

How can I check if a variable is set in PHP? Example code:

How can I sort an associative array by its keys in PHP? Example code:

How can I use the file_put_contents function to write a string to a file in PHP? Example code:

How can I use the implode function to join an array into a string with a separator in PHP? Example code:

How can I use the filemtime function to get the last modified time of a file in PHP? Example code:

How can I use the array_walk function to apply a function to each element of an array in PHP? Example code:

How can I use the array_reduce function to apply a function to each element of an array and reduce it to a single value in PHP? Example code:

How can I use the fgetcsv function to read a CSV file into an array in PHP? Example code:

How can I use the array_values function to get an array of values from an associative array in PHP? Example code:

How can I connect to a MySQL database using PHP? Example code.

How can I shuffle an array in PHP? Example code:

How can I use the array_intersect function to get the common elements between two or more arrays in PHP? Example code:

How can I trim whitespace from the beginning and end of a string in PHP? Example code:

How can I sort an array in PHP? Example code:

How can I use a switch statement with multiple cases in PHP? Example code:

How can I use the array_filter function to filter an array based on a condition in PHP? Example code:

How can I use the curl_setopt_array function to set multiple options for a cURL session in PHP? Example code:

How can I write to a CSV file in PHP? Example code:

How can I create a file in PHP? Example code:

How can I use the curl_setopt function to set options for a cURL session in PHP? Example code:

How can I use the is_readable function to check if a file is readable in PHP? Example code:

How can I calculate the difference between two dates in PHP? Example code:

How can I use a ternary operator in PHP? Example code:

How to create drop down menu in PHP with example

How can I use the mkdir function to create a directory in PHP? Example code: