PHP Practical Code Collection _php tips

1. Can read random string

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

Copy Code code as follows:

/**************
* @length-length of random string (must 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. Generate a random string

If you don't need a readable string, use this function instead to create a random string that acts as a random password for the user.

Copy Code code as follows:

/*************
*@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. Encoded Email Address

With this code, you can encode any e-mail address as an HTML character entity to prevent it from being collected by the Junk Mail program.

Copy Code code as follows:

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 = ' <a href= ' ma ';
$part 2 = ' Ilto: ';
$part 3 = ' "'. $attrs. ' > ';
$part 4 = ' </a> ';

$encoded = ' <script type= ' text/javascript ' > ';
$encoded. = "document.write (' $part 1 ');";
$encoded. = "document.write (' $part 2 ');";
foreach ($email as $e)
{
$encoded. = "document.write (' $e ');";
}
$encoded. = "document.write (' $part 3 ');";
foreach ($linkText as $l)
{
$encoded. = "document.write (' $l ');";
}
$encoded. = "document.write (' $part 4 ');";
$encoded. = ' </script> ';

return $encoded;
}

4. Verify email address

E-mail authentication is perhaps the most common form of Web page verification, which, in addition to verifying e-mail addresses, optionally checks the MX record in the DNS of the mail domain to make the message validation more powerful.

Copy Code code as follows:

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. Listing contents

Copy Code code as follows:

function List_files ($dir)
{
if (Is_dir ($dir))
{
if ($handle = Opendir ($dir))
{
while (($file = Readdir ($handle))!== false)
{
if ($file!= "." && $file!= "..." && $file!= "Thumbs.db")
{
Echo ' <a target= ' _blank ' href= '. $dir. $file. ' " > '. $file. ' </a><br> '. ' \ n ";
}
}
Closedir ($handle);
}
}
}

6. Destruction of the catalogue

Deletes a directory, including its contents.

Copy Code code as follows:

/*****
* @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. Parse JSON data

As with most popular WEB services such as Twitter, which provides data through an open API, it always knows how to parse the various delivery formats for API data, including Json,xml, and so on.

Copy Code code as follows:

$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. Parsing XML Data

Copy Code code as follows:

XML string
$xml _string= "<?xml version= ' 1.0 '?>
<users>
<user id= ' 398 ' >
<name>Foo</name>
<email>foo@bar.com</name>
</user>
<user id= ' 867 ' >
<name>Foobar</name>
<email>foobar@foo.com</name>
</user>
</users> ";

Load the XML string using SimpleXML
$xml = simplexml_load_string ($xml _string);

Loop through the each node of user
foreach ($xml->user as $user)
{
Access attribute
echo $user [' id '], ';
Subnodes are accessed by-> operator
echo $user->name, ';
echo $user->email, ' <br/> ';
}

9. Create the log thumbnail name

Creates a user-friendly log thumbnail name.

Copy Code code as follows:

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

10. Get the client's real IP address

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

Copy Code code as follows:

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

11. mandatory File Download

To provide users with mandatory file download capabilities.

Copy Code code as follows:

/********************
* @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";
}
}

12. Create a label cloud

Copy Code code as follows:

function Getcloud ($data = Array (), $minFontSize = $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;
$cloudTags [] = ' <a style= ' font-size: '. Floor ($size). ' PX '
. "Href=" # "title=". $tag.
' \ returned a count of '. $count. ' > '
. Htmlspecialchars (Stripslashes ($tag)). ' </a> ';
}

return join ("\ n", $cloudTags). "\ n";
}
/**************************
Sample usage ***/
$arr = Array (' Actionscript ' =>, ' Adobe ' =>, ' Array ' =>, ' Background ' => 43,
' Blur ' =>, ' Canvas ' =>, ' Class ' =>, ' Color Palette ' =>, ' crop ' => 42,
' Delimiter ' =>, ' Depth ' =>, ' design ' => 8, ' Encode ' =>, ' encryption ' => 30,
' Extract ' =>, ' Filters ' => 42);
Echo Getcloud ($arr, 12, 36);

13. Looking for the similarity of two strings

PHP provides a similar_text function that is rarely used, but this function is useful for comparing two strings and returning a percentage of similarity.

Copy Code code as follows:

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

14. Use Gravatar generic avatar in your application

As WordPress becomes more and more popular, Gravatar is also popular. Because Gravatar provides an easy-to-use API, it is also easy to incorporate into applications.

Copy Code code as follows:

/******************
* @email-email Address Gravatar
* @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 '/> ';
}

15. Truncate text at character Breakpoint

Hyphenation (word break), where a word can be disconnected during a career change. This function truncates the string at the hyphenation point.

Copy Code code as follows:

Original PHP Code by CHIRP Internet:www.chirp.com.au
Please acknowledge the use of this code by the including this header.
function Mytruncate ($string, $limit, $break = ".", $pad = "...") {
Return with no change if string is shorter than $limit
if (strlen ($string) <= $limit)
return $string;

are $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, 100, "");

16. File Zip Compression

Copy Code code as follows:

/* 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);

17. Extract zip file

Copy Code code as follows:

/**********************
* @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 ';
}

18. Default HTTP string for URL address

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

Copy Code code as follows:

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

19. Convert URL string to hyperlink

This function converts the URL and e-mail address string to a clickable hyperlink.

Copy Code code as follows:

function Makeclickablelinks ($text) {
$text = Eregi_replace ((f|ht) {1}tp://) [-a-za-z0-9@:%_+.~#?&//=]+) ',
' <a href= ' \1 ' >\1</a> ', $text);
$text = Eregi_replace ([[: Space:] () [{}]) (www.[ -a-za-z0-9@:%_+.~#?&//=]+) ',
' \1<a href= ' http://\2 ' >\2</a> ', $text);
$text = Eregi_replace ([_.0-9a-z-]+@ (0-9a-z][0-9a-z-]+.) +[a-z]{2,3}) ',
' <a href= ' mailto:\1 ' >\1</a> ', $text);

return $text;
}

20. Adjust Image size

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

Copy Code code as follows:

/**********************
* @filename-path to the image
* @tmpname-temporary path to thumbnail
* @xmax-max width
* @ymax-max Height
*/
function Resize_image ($filename, $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;
}

21. Detecting Ajax Requests

Most JavaScript frameworks, such as Jquery,mootools, send an extra http_x_requested_with header message when an AJAX request is made, and the header is an AJAX request, so you can detect AJAX requests on the server side.

Copy Code code as follows:

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