PHP in a Nutshell: A Desktop Quick Reference

By Paul Hudson

Now put in on greater than 20 million web domain names all over the world, personal home page is an undisputed chief in net programming languages. Database connectivity, robust extensions, and wealthy object-orientation are all purposes for its acceptance, yet approximately everybody may agree that, notably, Hypertext Preprocessor is without doubt one of the least difficult languages to benefit and use for constructing dynamic net purposes. the convenience of improvement and straightforwardness of personal home page, mixed with a wide neighborhood and expansive repository of open resource Hypertext Preprocessor libraries, make it a favourite of internet designers and builders worldwide.

PHP in a Nutshell is an entire connection with the middle of the language in addition to the preferred Hypertext Preprocessor extensions. This ebook does not attempt to compete with or exchange the generally on hand on-line documentation. in its place, it really is designed to supply intensity and breadth that cannot be stumbled on in different places. PHP in a Nutshell offers the utmost details density on Hypertext Preprocessor, with no all of the fluff and extras that get within the method. the subject grouping, counsel, and examples during this ebook supplement the net advisor and make this an important reference for each Hypertext Preprocessor programmer. This ebook makes a speciality of the capabilities common by way of a majority of builders, so that you can search for the knowledge you wish speedy. issues include:

  • Object-oriented PHP
  • Networking
  • String manipulation
  • Working with files
  • Database interaction
  • XML
  • Multimedia creation
  • Mathematics

Whether you are simply getting began or have years of expertise in Hypertext Preprocessor improvement, PHP in a Nutshell is a worthwhile addition on your table library.

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Print fopen($filename), yet all fopen()-related features settle for dossier handles because the dossier to paintings with. you want to shop the go back price of fopen() in a variable for later use: $handle = fopen($filename, "a"); if (! $handle) { print "Failed to open $filename for appending. \n"; } If the dossier can't be opened, fopen() returns fake. If the dossier is effectively opened, a dossier deal with is lower back and you may continue. as soon as the dossier deal with is prepared, we will be able to name different services at the opened dossier, counting on how the dossier was once opened (the moment parameter to fopen()). To learn from a dossier, the functionality fread() is used; to put in writing to a dossier, fwrite() is used. For now we are attracted to interpreting, so that you should still use rb for the second one parameter to fopen(). The fread() functionality takes parameters: a dossier deal with to learn from (this is the go back worth from fopen()) and the variety of bytes to learn. whilst mixed with the feof(), which takes a dossier deal with as its merely parameter and returns actual when you are on the finish of the dossier or fake in a different way, it turns into more straightforward to paintings with documents of numerous megabytes or, certainly, countless numbers of megabytes. for instance: $huge_file = fopen("VERY_BIG_FILE. txt", "r"); whereas (! feof($huge_file)) { print fread($huge_file, 1024); } fclose($huge_file); This use of fread() can also be stable for for those who basically care a few small a part of the dossier. for instance, Zip documents all commence with the letters "PK", as a way to do a brief payment to make sure a given dossier is a zipper dossier with this code: $zipfile = fopen("data. zip", "r"); if (fread($zipfile, 2) ! = "PK") { print "Data. zip isn't a legitimate Zip dossier! "; } fclose($zipfile); To coach Hypertext Preprocessor to exploit fread() to learn within the whole contents of a dossier, you want to specify the precise dossier measurement in bytes because the moment parameter to fread(). personal home page involves the rescue back with the filesize() functionality, which takes the identify of a dossier to envision and returns its filesize in bytes—precisely what we are searching for. Tip don't fret approximately specifying a host within the moment parameter that's greater than the file—PHP will cease analyzing whilst it hits the top of the dossier or the variety of bytes within the moment parameter, whichever comes first. while studying a dossier, personal home page makes use of a dossier pointer to figure out which byte it truly is at the moment up to—like the array cursor. at any time when you learn in a byte, personal home page advances the dossier pointer through one position. analyzing within the complete dossier instantly advances the pointer to the tip of the dossier. So, to take advantage of fread() to learn in a complete dossier, we will use the subsequent line: $contents = fread($handle, filesize($filename)); discover that fread()'s go back price is the textual content it learn in, and within the above state of affairs, that's the complete dossier. to complete off utilizing fread(), it is crucial to shut the dossier once you're performed with it. caution utilizing fclose() instantly closes a dossier deal with (although personal home page will immediately shut any dossier handles while your script finishes). to shut a dossier you have got opened with fopen(), use fclose(). This takes the dossier deal with we acquired from fopen() and returns actual if it was once in a position to shut the dossier effectively.

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