Search Results for: javascript string

This article outlines the PHP_SELF attribute of the $_SERVER system information variable and why you should never, ever use it. What is _$SERVER? Check out our full article on $_SERVER here – but in short, it’s a variable containing an array with information about your PHP environment – including server and request details that are quite sensitive and shouldn’t be publicly accessible. What is $_SERVER[‘PHP_SELF’] ? $_SERVER[‘PHP_SELF’] contains the full path to the PHP script being executed, including any query parameters. This allows the party making the request to include arbitrary data. Displaying data … Read more

This easy tutorial will show you how to use the PHP empty() function to check whether a variable can be considered empty and show some code examples. What Is Empty? A variable is considered empty in PHP if its value equates to FALSE or the variable does not exist. This means that the following are considered empty: An empty string (“”) The number zero (0) In any form (0.0000) Including strings containing only a 0 character (“0”) Boolean FALSE NULL An undeclared variable Empty arrays The empty() function is different from the isset() function. The latter checks only whether … Read more

This article will show you how to process a PHP array using array_map() to run a function on each item in the array. Why use array_map()? Arrays store a sequence of values in a single variable. If you’re storing those values, you probably want to do something with them at some point. Say, for example, you had an array of numbers, and you wanted to calculate the square of each number to be stored in a new array. You could create an empty array, loop through the original array calculating … Read more