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

$filename = "data.csv";
$file = fopen($filename, "a");

$name = "John Doe";
$email = "[email protected]";

// Write data to file
fwrite($file, $name . "," . $email . "\n");

fclose($file);

How can I use a regular expression to replace a pattern in a string 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 the rename function to rename a file or directory in PHP? Example code:

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

How can I use the filesize function to get the size of a file in PHP? Example code:

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

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

How can I loop through an array in PHP? Example code

How can I check if a string ends with a certain substring in PHP? Example code:

How can I use the array_shift function to remove the first element from an array in PHP? Example code:

How can I use the strrev function to reverse a string 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 calculate the sum of an array in PHP? Example code:

How can I use the array_slice function to get a portion of an array in PHP? Example code:

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

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

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

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

How can I send an email using PHP? Example code

How can I format a number with commas in PHP? Example code:

How can I use a try-catch block in PHP? Example code:

How can I trim whitespace from the beginning and end of a string 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 use the array_merge function to merge two or more arrays in PHP? Example code:

How can I use the array_chunk function to split an array into chunks 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 array_pop function to remove the last element from an array in PHP? Example code:

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

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

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