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Collection of 21 handy PHP function code _php Tips

Source: Internet
Author: User
Tags rand readable ziparchive mx record
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PHP is currently the most widely used web-based programming language, driving millions of web sites, including some large sites such as Facebook. This collection of 21 practical and convenient snippets of PHP code is helpful for each type of PHP developer.





1. PHP 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.

/**************
* @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. PHP generates 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.

/*************
*@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 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.

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 = ' &lt;a href= ' ma ';


$part 2 = ' Ilto: ';


$part 3 = ' "'. $attrs. ' &gt; ';


$part 4 = ' &lt;/a&gt; ';





$encoded = ' &lt;script type= ' text/javascript ' &gt; ';


$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. = ' &lt;/script&gt; ';





return $encoded;


}

4. PHP Authentication 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.

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!= "." &amp;&amp; $file!= "..." &amp;&amp; $file!= "Thumbs.db")


{


Echo ' &lt;a target= ' _blank ' href= '. $dir. $file. ' " &gt; '. $file. ' &lt;/a&gt;&lt;br&gt; '. ' \ n ";


}


}


Closedir ($handle);


}


}


}

6. PHP Destruction 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) &amp;&amp; $handle = Opendir ($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

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.

$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= "<?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. PHP Create log abbreviated name

Creates a user-friendly log thumbnail name.

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

PHP gets the client's real IP address

This 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 be 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 capabilities.

/********************
* @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 = $maxFontSize = 30)


{


$minimumCount = Min (array_values ($data));


$maximumCount = Max (Array_values ($data));


$spread = $maximumCount-$minimumCount;


$cloudHTML = ';


$cloudTags = Array ();





$spread = = 0 &amp;&amp; $spread = 1;





foreach ($data as $tag =&gt; $count)


{


$size = $minFontSize + ($count-$minimumCount)


* ($maxFontSize-$minFontSize)/$spread;


$cloudTags [] = ' &lt;a style= ' font-size: '. Floor ($size). ' PX '


. "Href=" # "title=". $tag.


' \ returned a count of '. $count. ' &gt; '


. Htmlspecialchars (Stripslashes ($tag)). ' &lt;/a&gt; ';


}





return join ("\ n", $cloudTags). "\ n";


}


/**************************


Sample usage ***/


$arr = Array (' Actionscript ' =&gt;, ' Adobe ' =&gt;, ' Array ' =&gt;, ' Background ' =&gt; 43,


' Blur ' =&gt;, ' Canvas ' =&gt;, ' Class ' =&gt;, ' Color Palette ' =&gt;, ' crop ' =&gt; 42,


' Delimiter ' =&gt;, ' Depth ' =&gt;, ' design ' =&gt; 8, ' Encode ' =&gt;, ' encryption ' =&gt; 30,


' Extract ' =&gt;, ' Filters ' =&gt; 42);


Echo Getcloud ($arr, 12, 36);

PHP looking for 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.

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

PHP uses Gravatar generic avatar in applications

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.

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

PHP truncates text at character breakpoints

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

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, "");

PHP file Zip compression

/* 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) &amp;&amp;! $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 ($zip-&gt;open ($destination, $overwrite? Ziparchive::overwrite:ziparchive::create)!== true) {


return false;


}


Add the Files


foreach ($valid _files as $file) {


$zip-&gt;addfile ($file, $file);


}


Debug


Echo ' The zip archive contains ', $zip-&gt;numfiles, ' files with a status of ', $zip-&gt;status;





Close the zip--done!


$zip-&gt;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 uncompressed 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 for URL address preset HTTP string

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.

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 to a clickable hyperlink.

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})',


return $text;
}

Adjust image size in PHP

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 ($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 &lt;= $xmax &amp;&amp; $y &lt;= $ymax)


return $im;





if ($x &gt;= $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 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.

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

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

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

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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