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

Listen

$string = "The quick brown fox jumps over the lazy dog";

if (strpos($string, "fox") !== false) {
    echo "The string contains 'fox'";
} else {
    echo "The string does not contain 'fox'";
}

How can I send an email using PHP? Example code

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

How can I use the strrev function to reverse a string in PHP? Example code:

How can I use the in_array function to check if an element exists in an array in PHP? Example code:

How can I use the htmlentities function to convert special characters to HTML entities 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 use the array_rand function to get a random key from an array in PHP? Example code:

How can I check if a string starts with a certain substring 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 convert a string to lowercase 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 subtract days from a date in PHP? Example code:

How can I loop through an array 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 add days to a date in PHP? Example code:

How can I prevent SQL injection in PHP?

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 array_keys function to get an array of keys from an associative array 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 a switch statement in PHP? Example code:

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

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

How can I use the copy function to copy a file 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 calculate the difference between two dates in PHP? Example code:

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

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

How can I use the array_search function to search for a value in an array and return its key in PHP? Example code:

How can I read a CSV file 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: