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

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

$keys = array_keys($person);

print_r($keys);

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 convert a string to lowercase in PHP? Example code:

How can I use the scandir function to get a list of files and directories in a directory in PHP? Example code:

How can I use the array_unique function to remove duplicate elements from an array in PHP? Example code:

How can I use the file_get_contents function to read the contents of a file into a string in PHP? Example code:

How can I use the str_replace function to replace multiple substrings in a string in PHP? Example code:

How can I use a for loop in PHP? Example code:

How can I use the array_reverse function to reverse the order of an array in PHP? Example code:

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

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

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

PHP Use Cases with Example Source Code

How can I upload a file using PHP? Example code

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

How can I use a do-while loop 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 format a number with commas 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 use the array_pop function to remove the last element from an array in PHP? Example code:

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

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

How can I use the explode function to split a string into an array with a limit in PHP? Example code:

How can I replace a substring in a string 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 json_decode function to convert a JSON string to an array or object in PHP? Example code:

How can I create a multidimensional array in PHP? Example code:

How can I use the fopen and fwrite functions to write a string to a file in PHP? Example code:

How can I validate a form using PHP? Example code

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

How to send SMS using PHP program (full code sample included)