< 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…
< 1 min readTo remove the last item from an array in PHP, you can use the array_pop() function. This function removes the last element from an array, and returns the value of the removed element. For example: You can also use the unset() function to remove an element from an array by its key. For example: Note…
< 1 min readTo remove the first item from an array in PHP, you can use the array_shift() function. This function removes the first element from an array, and returns the value of the removed element. For example: You can also use the unset() function to remove an element from an array by its key. For example: Note…
< 1 min readTo sort an array alphabetically in PHP, you can use the sort() function. This function sorts an array in ascending order, and assigns the sorted values to the original array. For example: This would output: If you want to sort the array in descending order, you can use the rsort() function. If you want to…
< 1 min readTo calculate the sum of the values in an array in PHP, you can use the array_sum() function. This function returns the sum of all the values in the array. For example: You can also use a loop to calculate the sum of the values in the array manually. For example: If you want to…
< 1 min readTo remove empty values from an array in PHP, you can use the array_filter() function. This function filters the elements of an array using a callback function, and returns an array with only the elements that pass the test implemented by the callback function. For example, to remove empty values from an array, you can…
< 1 min readTo sort an associative array in PHP, you can use the asort() function. This function sorts an array by the values, while preserving the keys. For example: This would output: If you want to sort the array in reverse order, you can use the arsort() function. If you want to sort the array by the…
