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

$string = "Hello World";

echo strtolower($string);

How can I use a conditional statement 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 sort an array in descending order in PHP? Example code:

How to create drop down menu in PHP with example

How can I create a multidimensional 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 an if-else statement in PHP? Example code:

How can I use the array_push function to add an element to an array in PHP? Example code:

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

How can I use the curl_exec function to execute a cURL session and get the response in PHP? Example code:

How can I use an elseif statement in PHP? Example code:

How can I add days to a date in PHP? Example code:

How can I use the array_merge function to merge two or more arrays in PHP? Example code:

How can I sort an associative array by its keys 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 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 scandir function to get a list of files and directories in a directory in PHP? Example code:

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

PHP Use Cases with Example Source Code

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

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

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

How can I use the array_rand function to get a random key from an array in PHP? Example code:

How can I use a regular expression to match a pattern in a string in PHP? Example code:

What is PHP code?

How can I redirect to another page in PHP? Example code:

How can I retrieve data from a MySQL database using PHP? Example code

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

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