21 Useful handy PHP function code _php Tutorials

PHP is currently the most widely used Web-based programming language, driving millions of websites, including some large sites such as Facebook. This collection of 21 useful snippets of PHP code is helpful for every type of PHP developer.

1. PHP can read random strings

This code creates a readable string that is closer to the word in the dictionary, and is practical and has password validation capabilities.

/************** * @length-length of random string (must be a multiple of 2) **************/ function readable_random_string ($length = 6) { $conso =array ("B", "C", "D", "F", "G", "H", "J", "K", "L", "M", "N", "P", "R", "s", "T", "V", "w", "X", "Y", "z"); $vocal =array ("A", "E", "I", "O", "U"); $password = ""; Srand (Double) microtime () *1000000); $max = $length/2; for ($i =1; $i <= $max; $i + +) { $password. = $conso [Rand (0,19)]; $password. = $vocal [Rand (0,4)]; } return $password; }

2. PHP generates a random string

If you do not need a readable string, use this function instead to create a random string, as a random password for the user, and so on.

/************* *@l-length of random string */ function Generate_rand ($l) { $c = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; Srand (Double) microtime () *1000000); for ($i =0; $i < $l; $i + +) { $rand. = $c [Rand ()%strlen ($c)]; } return $rand; }

3. PHP encoded e-mail address

With this code, any e-mail address can be encoded as an HTML character entity to prevent it from being collected by the spam program.

function Encode_email ($email = ' info@domain.com ', $linkText = ' contact Us ', $attrs = ' class= ' Emailencoder "') { Remplazar Aroba y Puntos $email = Str_replace (' @ ', ' @ ', $email); $email = Str_replace ('. ', '. ', $email); $email = Str_split ($email, 5); $linkText = Str_replace (' @ ', ' @ ', $linkText); $linkText = Str_replace ('. ', '. ', $linkText); $linkText = Str_split ($linkText, 5); $part 1 = ' $part 2 = ' Ilto: '; $part 3 = ' "'. $attrs. ' > '; $part 4 = "; $encoded = "; return $encoded; }

4. PHP Verification Email Address

e-mail validation is perhaps the most common form validation in Web pages, which, in addition to verifying e-mail addresses, also has the option of checking the MX records in the DNS that the mail domain belongs to, making the message verification feature more powerful.

function Is_valid_email ($email, $test _mx = False) { if (eregi ("^ ([_a-z0-9-]+) (\.[ _a-z0-9-]+) *@ ([a-z0-9-]+) (\.[ a-z0-9-]+) * (\.[ a-z]{2,4}) $ ", $email)) if ($test _mx) { List ($username, $domain) = Split ("@", $email); Return Getmxrr ($domain, $mxrecords); } Else return true; Else return false; }

5. PHP Lists directory contents

function List_files ($dir) { if (Is_dir ($dir)) { if ($handle = Opendir ($dir)) { while (($file = Readdir ($handle))!== false) { if ($file! = "." && $file! = ":" && $file! = "Thumbs.db") { Echo '. $file. ' '." \ n "; } } Closedir ($handle); } } }

6. PHP Destroy Directory

Deletes a directory, including its contents.

/***** * @dir-directory to destroy * @virtual [optional]-whether a virtual directory */ function Destroydir ($dir, $virtual = False) { $ds = Directory_separator; $dir = $virtual? Realpath ($dir): $dir; $dir = substr ($dir,-1) = = $ds? substr ($dir, 0,-1): $dir; if (Is_dir ($dir) && $handle = Opendir ($dir)) { while ($file = Readdir ($handle)) { if ($file = = '. ' | | $file = = ' ... ') { Continue } ElseIf (Is_dir ($dir. $ds. $file)) { Destroydir ($dir. $ds. $file); } Else { Unlink ($dir. $ds. $file); } } Closedir ($handle); RmDir ($dir); return true; } Else { return false; } }

7. PHP Parsing JSON data

Like most popular Web services such as Twitter, which provides data through an open API, it is always able to know how to parse the various delivery formats for API data, including Json,xml, and so on.

$json _string= ' {"id": 1, "name": "foo", "email": "foo@foobar.com", "Interest": ["WordPress", "PHP"]} '; $obj =json_decode ($json _string); Echo $obj->name; Prints Foo Echo $obj->interest[1]; Prints PHP

8. PHP Parsing XML data

XML string $xml _string= " Foo Foo@bar.com Foobar Foobar@foo.com "; Load the XML string using SimpleXML $xml = simplexml_load_string ($xml _string); Loop through the each node of the user foreach ($xml->user as $user) { Access attribute echo $user [' id '], '; Subnodes is accessed by, operator echo $user->name, "; echo $user->email, ' '; }

9. PHP Create a log thumbnail name

Create a user-friendly log thumbnail name.

function Create_slug ($string) { $slug =preg_replace ('/[^a-za-z0-9-]+/', '-', $string); return $slug; }

PHP Gets the client real IP address

The function will get the real IP address of the user, even if he uses a proxy server.

function Getrealipaddr () { if (!emptyempty ($_server[' http_client_ip ')) { $ip =$_server[' http_client_ip ']; } ElseIf (!emptyempty ($_server[' http_x_forwarded_for ')) To check IP was pass from proxy { $ip =$_server[' http_x_forwarded_for ']; } Else { $ip =$_server[' remote_addr ']; } return $IP; }

PHP Mandatory File Download

To provide users with mandatory file download function.

/******************** * @file-path to File */ function Force_download ($file) { if ((Isset ($file)) && (File_exists ($file))) { Header ("Content-length:". FileSize ($file)); Header (' Content-type:application/octet-stream '); Header (' content-disposition:attachment; Filename= '. $file. '"'); ReadFile ("$file"); } else { echo "No file selected"; } }

PHP Create Tag Cloud

function Getcloud ($data = Array (), $minFontSize = A, $maxFontSize = 30) { $minimumCount = Min (array_values ($data)); $maximumCount = Max (Array_values ($data)); $spread = $maximumCount-$minimumCount; $cloudHTML = "; $cloudTags = Array (); $spread = = 0 && $spread = 1; foreach ($data as $tag = $count) { $size = $minFontSize + ($count-$minimumCount) * ($maxFontSize-$minFontSize)/$spread; $cloudTags [] = '. ' "href=" # "title=" \ ". $tag. ' \ ' returned a count of '. $count. ' > ' . Htmlspecialchars (Stripslashes ($tag)). ''; } return join ("\ n", $cloudTags). "\ n"; } /************************** Sample usage ***/ $arr = Array (' Actionscript ' = +, ' Adobe ' = ' + ', ' array ' = +, ' Background ' = 43, ' Blur ' +, ' Canvas ' = +, ' Class ' = ', ' Color Palette ' and ' 42 ', ' Crop ', ' Delimiter ' and ' Depth ', ' Design ' = 8, ' Encode ', ' + ', ' encryption ' and ' = 30, ' Extract ', ' Filters ' and ' 42 '; Echo Getcloud ($arr, 12, 36);

PHP looks for the similarity of two strings

PHP provides a minimal use of the Similar_text function, but this function is useful for comparing two strings and returning percentages of similar degrees.

Similar_text ($string 1, $string 2, $percent); $percent would have the percentage of similarity

PHP uses the Gravatar generic avatar in the application

With WordPress becoming more and more popular, Gravatar is also popular with them. Because Gravatar provides an easy-to-use API, it is also very convenient to incorporate it into your application.

/****************** * @email-email address to show Gravatar for * @size-size of Gravatar * @default-url of default Gravatar to use * @rating-rating of Gravatar (G, PG, R, X) */ function Show_gravatar ($email, $size, $default, $rating) { Echo ' &default= '. $default. ' &size= '. $size. ' &rating= '. $rating. ' width= '. $size. ' px ' Height= "'. $size. ' px '/> '; }

PHP truncates text at character break points

The so-called hyphenation (word break), a place where a word can be broken when changing careers. This function truncates the string at the hyphenation point.

//Original PHP Code by CHIRP Internet:www.chirp.com.au // Please acknowledge use of the this Code by including the this header. Function Mytruncate ($string, $limit, $break = ".", $pad = "...") { //return with no change if string is shorter than $ Limit if (strlen ($string) <= $limit) return $string; //is $break present between $limit and the end of the string? if (false!== ($breakpoint = Strpos ($string, $break, $limit))) { if ($breakpoint < strlen ($string)-1) { $string = substr ($string, 0, $breakpoint). $pad; } } return $string; } /***** Example ****/ $short _string=mytruncate ($long _string, +, ');

Zip compression for PHP files

/* Creates a compressed zip file */ function Create_zip ($files = Array (), $destination = ", $overwrite = False) { If the zip file already exists and overwrite is false, return false if (file_exists ($destination) &&! $overwrite) {return false;} VARs $valid _files = Array (); If files were passed in ... if (Is_array ($files)) { Cycle through each file foreach ($files as $file) { Make sure the file exists if (file_exists ($file)) { $valid _files[] = $file; } } } If we have good files ... if (count ($valid _files)) { Create the Archive $zip = new Ziparchive (); if ($zip->open ($destination, $overwrite? Ziparchive::overwrite:ziparchive::create)!== true) { return false; } Add the Files foreach ($valid _files as $file) { $zip->addfile ($file, $file); } Debug Echo ' The zip archive contains ', $zip->numfiles, ' files with a status of ', $zip->status; Close the zip--done! $zip->close (); Check to make sure the file exists return file_exists ($destination); } Else { return false; } } /***** Example Usage ***/ $files =array (' file1.jpg ', ' file2.jpg ', ' file3.gif '); Create_zip ($files, ' Myzipfile.zip ', true);

PHP Extract Zip file

/********************** * @file-path to zip file * @destination-destination directory for unzipped files */ function Unzip_file ($file, $destination) { Create Object $zip = new Ziparchive (); Open Archive if ($zip->open ($file)!== TRUE) { Die (' Could not open archive '); } Extract contents to destination directory $zip->extractto ($destination); Close Archive $zip->close (); Echo ' Archive extracted to directory '; }

PHP default HTTP string for URL address

Sometimes you need to accept the URL input from some forms, but the user rarely adds the http://field, and this code adds the field to the URL.

if (!preg_match ("/^ (HTTP|FTP):/", $_post[' URL '))) { $_post[' url '] = ' http://'. $_post[' url ']; }

PHP converts URL strings to hyperlinks

This function converts the URL and e-mail address string into clickable hyperlinks.

function makeClickableLinks($text) { $text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)', '\1', $text); $text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)', '\1\2', $text); $text = eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})', return $text; }

PHP Adjust image size

Creating an image thumbnail takes a lot of time, and this code will help you understand the logic of the thumbnail.

/********************** * @filename-path to the image * @tmpname-temporary path to thumbnail * @xmax-max width * @ymax-max height */ Function resize_image ($f Ilename, $tmpname, $xmax, $ymax) { $ext = explode (".", $filename); $ext = $ext [Count ($ext)-1]; if ($ext = = "JPG" | | $ext = = "jpeg") $im = Imagecreatefromjpeg ($tmpname); ElseIf ($ext = = "png") $im = Imagecreatefrompng ($tmpname); ElseIf ($ext = = "gif") $im = Imagecreatefromgif ($tmpname); $x = Imagesx ($im); $y = Imagesy ($im); if ($x <= $xmax && $y <= $ymax) return $im; if ($x >= $y) { $newx = $xmax; $newy = $newx * $y/$x; } Else { $newy = $ymax; $newx = $x/$y * $newy; } $im 2 = Imagecreatetruecolor ($newx, $newy); Imagecopyresized ($im 2, $im, 0, 0, 0, 0, Floor ($newx), Floor ($newy) , $x, $y); Return $im 2; }

PHP detects AJAX requests

Most JavaScript frameworks, such as Jquery,mootools, send additional Http_x_requested_with header information when making AJAX requests, so you can detect AJAX requests on the server side as they are an AJAX request.

if (!emptyempty ($_server[' Http_x_requested_with ')) && strtolower ($_server[' http_x_requested_with ']) = = ' XMLHttpRequest ') { If AJAX Request Then }else{ Something else }

English manuscripts: Really Useful & Handy PHP Code Snippets | Web Developer Plus

Translation finishing: 21+ practical and convenient PHP code excerpt | Mango

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