< 1 min readAn event emitter is an object that can emit events and register listeners for those events. Event emitters are often used in Node.js to implement the publish-subscribe pattern, where one or more objects publish events and zero or more objects subscribe to those events and execute some code when the events are emitted. In Node.js,…
< 1 min readTo get the current URL in PHP, you can use the $_SERVER[‘REQUEST_URI’] variable. This variable contains the path of the current request, including the query string (if any). For example: You can also use the $_SERVER[‘PHP_SELF’] variable to get the path of the current script, or the $_SERVER[‘SCRIPT_NAME’] variable to get the path of the…
< 1 min readTo convert a string to lowercase in PHP, you can use the strtolower() function. This function converts all the characters of a string to lowercase, and returns the modified string. For example: You can also use the mb_strtolower() function to convert a multibyte string to lowercase. This function requires the mbstring extension to be enabled…
< 1 min readTo convert a string to uppercase in PHP, you can use the strtoupper() function. This function converts all the characters of a string to uppercase, and returns the modified string. For example: You can also use the mb_strtoupper() function to convert a multibyte string to uppercase. This function requires the mbstring extension to be enabled…
< 1 min readTo convert the first letter of a word to uppercase in PHP, you can use the ucfirst() function. This function converts the first character of a string to uppercase, and returns the modified string. For example: You can also use the mb_strtoupper() function to convert the first character of a multibyte string to uppercase. This…
< 1 min readTo find the length of a string in PHP, you can use the strlen() function. This function returns the number of characters in the string. For example: You can also use the mb_strlen() function to find the length of a string in bytes, or to count the number of characters in a multibyte string. This…
< 1 min readTo check whether a variable is set in PHP, you can use the isset() function. This function returns true if the variable is set, and false otherwise. A variable is considered set if it has been assigned a value, even if the value is null. For example: This would output $var is set. You can…
< 1 min readTo check whether a variable is empty in PHP, you can use the empty() function. This function returns true if the variable is empty, and false otherwise. A variable is considered empty if it is: null an empty string (”) a string of whitespaces (‘ ‘) an empty array (array()) a number that is equal…
< 1 min readTo check whether a variable is null in PHP, you can use the is_null() function. This function returns true if the variable is null, and false otherwise. For example: This would output $var is null. You can also use the === operator to check whether a variable is null. This operator returns true if the…
< 1 min readTo reverse a string in PHP, you can use the strrev() function. This function returns a string in which the characters are reversed. For example: If you want to reverse a string without using any built-in functions, you can use a loop to iterate through the string and build a new string with the characters…
