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

$fruits = array("apple", "banana", "orange");

array_unshift($fruits, "grape");

print_r($fruits);

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

How can I retrieve data from a MySQL database using 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 use the scandir function to get a list of files and directories in a directory in PHP? Example code:

How can I prevent SQL injection in PHP?

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

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

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

How can I get the current date and time in PHP? Example code:

How can I subtract days from a date in PHP? Example code:

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

How can I use the fopen and fgets functions to read a file line by line in PHP? Example code:

How can I sort an associative array by its keys 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 delete a file 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 the mkdir function to create a directory in PHP? Example code:

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

How can I create a multidimensional array 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 validate a form using 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 calculate the sum of an array 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 loop through an array in PHP? Example code

How can I upload a file using PHP? Example code

What is PHP code?

How can I use an if-else statement 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: