THE TUTORIAL LIBRARY
preg_match() is the function that matches one pattern with the subject string and returns either true or false depending whether the subject matched the pattern. It also can return
Read tutorialIn case you want to create a temporary file, the best way to do it is with the tmpfile() function. This function creates a temporary file with a unique random name in the current d
Read tutorialPHP provides the unlink() function for deleting a file, which "unlinks" the file from a directory. On a UNIX-like system the file will only be deleted if no programs have this file
Read tutorialWhile writing to files that are possibly being read by other scripts at the same time, you will run into problems at some point because a write might not totally be completed while
Read tutorialLet's begin with the basic file-accessing functions. Originally, those functions only worked on normal files, so their names begin with "f," but PHP extends this to almost everythi
Read tutorialThe first line is the XML declaration; it specifies the XML version and the XML file encoding. Notice that the line starts with
Read tutorialBLOB stands for Binary Large OBject and refers to binary data, such as JPEG images stored in the database.
Read tutorialThis article contains some information about the strengths and weaknesses of MySQL.
Read tutorialA PHP session allows an application to store information for the current "session," which can be defined as one user being logged in to your application. A session is identified by
Read tutorialOne simple way to maintain data between the different pages in a web application is with cookies. Cookies are sent by PHP through the web server with the setcookie() function and a
Read tutorialThe Crypt_HMAC class implements the algorithm as described in RFC 2104 and can be installed with pear install crypt_hmac.
Read tutorialIf you need to prevent bad guys from tampering with variables passed in the URL (such as for a redirect as shown previously, or for links that pass special parameters to the linked
Read tutorialOne example today. A better developer tomorrow.