Validation of email
This is the second PHP snippet I’m sharing from my library. It is not very complicated but get’s the job done. It both checks for the email syntax (REGEX) and existence of the email domain by checking MX & A records…
License
This code is free to use, distribute, modify and study. When referencing please link back to this website / post in any way e.g. direct link, credits etc. If you find this useful, please leave a comment and share using the buttons below!
<?php
$email="test@domain.com";
if (!preg_match("/^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)*\.\w{2,8}$/i",$email)){
//E-mail syntax is invalid
} elseif(!checkdnsrr(array_pop( explode("@",$email) ), "MX" ) && !checkdnsrr(array_pop( explode("@",$email) ), "A" )) {
//Email server is not valid
} else {
//E-mail is valid
}
?>
For the last couple of years, I’ve been mostly doing PHP coding. As a result, I have small library of code snippets of my own. Those are simple but useful PHP codes that might save some time on your work!
First one I’m sharing here today is the combination of regular expression and the PHP code to do ZIP code (or Postal Code) validation for following 12 countries: United States of America, United Kingdom, Germany, Canada, France, Italy, Australia, Netherlands, Spain, Denmark, Sweden & Belgium.
Code is provided in PHP but the REGEX codes are universal and those can be used with other programming languages.
License
This code is free to use, distribute, modify and study. When referencing please link back to this website / post in any way e.g. direct link, credits etc. If you find this useful, please leave a comment and share using the buttons below!
<?php
$country_code="US";
$zip_postal="11111";
$ZIPREG=array(
"US"=>"^\d{5}([\-]?\d{4})?$",
"UK"=>"^(GIR|[A-Z]\d[A-Z\d]??|[A-Z]{2}\d[A-Z\d]??)[ ]??(\d[A-Z]{2})$",
"DE"=>"\b((?:0[1-46-9]\d{3})|(?:[1-357-9]\d{4})|(?:[4][0-24-9]\d{3})|(?:[6][013-9]\d{3}))\b",
"CA"=>"^([ABCEGHJKLMNPRSTVXY]\d[ABCEGHJKLMNPRSTVWXYZ])\ {0,1}(\d[ABCEGHJKLMNPRSTVWXYZ]\d)$",
"FR"=>"^(F-)?((2[A|B])|[0-9]{2})[0-9]{3}$",
"IT"=>"^(V-|I-)?[0-9]{5}$",
"AU"=>"^(0[289][0-9]{2})|([1345689][0-9]{3})|(2[0-8][0-9]{2})|(290[0-9])|(291[0-4])|(7[0-4][0-9]{2})|(7[8-9][0-9]{2})$",
"NL"=>"^[1-9][0-9]{3}\s?([a-zA-Z]{2})?$",
"ES"=>"^([1-9]{2}|[0-9][1-9]|[1-9][0-9])[0-9]{3}$",
"DK"=>"^([D-d][K-k])?( |-)?[1-9]{1}[0-9]{3}$",
"SE"=>"^(s-|S-){0,1}[0-9]{3}\s?[0-9]{2}$",
"BE"=>"^[1-9]{1}[0-9]{3}$"
);
if ($ZIPREG[$country_code]) {
if (!preg_match("/".$ZIPREG[$country_code]."/i",$zip_postal)){
//Validation failed, provided zip/postal code is not valid.
} else {
//Validation passed, provided zip/postal code is valid.
}
} else {
//Validation not available
}
?>
If you haven’t noticed yet, this website is powered by WordPress and speed is optimized using W3 Total Cache… Previously I was using WP Super Cache but recently decided to try W3 Total Cache as it’s feature set (minify, cdn, etc.) is looking better. For my setup it actually worked better so I kept it as my caching plugin.
But it took me a while to figure out it’s “Cache Preload” option is not working well or at least not working as I expected. “Automatically prime the page cache” was checked but pages were not in cache…
After searching a bit I found the culprit. W3 Total Cache relies on internal cron of WordPress and it’s only triggered by site activity. If your site has no visitors for a while loading the pages will be slower because: 1. W3TC will check if the current page is cache and if it’s expired. 2. Needs to clean up that expired page and re-generate a current copy. 3. Finally serve that file.
My first attempt to fix that was trying to put a real cron job for wp-cron.php but that didn’t worked well. Cron was working but W3TC still failed to prime the cache. There are couple of threads about that at the wordpress support forums.
Optimus Cache Prime (OCP) is a smart cache preloader for websites with XML sitemaps. It crawls all URLs in a given sitemap so the web server builds cached versions of the pages before visitors or search engine spiders arrive.
My next attempt was trying to use Optimus Cache Prime, a Phyton script written by Patrick Mylund Nielsen.
That was exactly what I needed… But…
My host had Python 2.4 installed and ocp.py required 2.5+
I have asked my hosting (Inmotion) but they said they cannot change that on shared hosting and I should move to virtual private server (VPS) just for that… Yeah, sure!
Finally, I have decided to stop being lazy and created my own solution using PHP which I will be sharing here with you.
Idea
This PHP script has the same basic idea as Optimus Cache Prime and uses sitemap.xml as it’s source.
It will read the sitemap.xml file, parse the local URL’s listed in it. Then checks if the cache file for that url exists in W3TC. If the cache exists it will skip that url. But if not, it will visit the link using minimal resources causing the W3TC re-create cache for that page.
System Requirements
- PHP5 (Required due to SimpleXML, you may change that to use with earlier versions of PHP)
- W3 Total Cache
- WP Super Cache (Not tested! But it should work)
Usage
- Copy the code into a php file (warm.php) and place it in the site root where sitemap.xml exists.
- Review/edit the configuration options inside the script.
- Set a cron job to run that script every 5 minutes (or even every minute as the code is very easy on the system resources.)
- Sample: */5 * * * * php -q /home/youraccount/public_html/warm.php
- Thats it!
Features
- Reads sitemap.xml as a file, saving a web server call.
- Checks for the local cache file before trying to re-cache, saving resources.
- Optionally uses priority tags in sitemap.xml
- Configurable page limit per session, useful for larger sites.
- Frees memory and stops executing as soon as possible to save further resources.
- Failsafe to stop executing in case of an url or network problem.
- New: Option to fix trailing slash cache creation problem.
Code & Download
- Current version: Version 2.1 – 21 August 2011
- Download warm.php
License
This code is free to use, distribute, modify and study. If you modify it please keep my copyright intact. When referencing please link back to this website / post in any way e.g. direct link, credits etc. If you find this useful, please leave a comment and share using the buttons below!
<?php
// W3 TOTAL CACHE WARMER (PRELOADER) by Pixel Envision (E.Gonenc)
// Version 2.1 - 21 August 2011
//Configuration options
$priority = true;//Use priorities defined in sitemap.xml (true/false)
$ppi = 10;//Pages to be cached per interval
$delay = 0.5;// Delay in seconds between page checks, default is half a second
$quiet = true;// Do not output process log (true/false)
$trailing_slash = false;// Add trailing slash to URL's, that might fix cache creation problems (true/false)
$sitemap = "sitemap.xml";//Path to sitemap file relative to the warm.php
// Defaults for W3TC
$index = "_index.html";//Cache file to check
$rootp = "wp-content/w3tc/pgcache";//Root of cache
//Do not change anything below this line unless you know what you are doing
ignore_user_abort(TRUE);
set_time_limit(600);
$xml = simplexml_load_file($sitemap);
$UL=$UP=array();
foreach ($xml->url as $url_list) {
$UL[]=$url_list->loc;
$UP[]=$url_list->priority;
}
unset($xml);
if($priority==true) {arsort($UP,$sort_flags = SORT_NUMERIC);}
$i=0;
foreach ($UP as $key => $val) {
$path=$rootp;
$url=$UL[$key];
$sub=explode("/",$url);
if($sub[3]) {$path.="/".urldecode($sub[3]);}
if($sub[4]) {$path.="/".urldecode($sub[4]);}
if($sub[5]) {$path.="/".urldecode($sub[5]);}
$path.="/".$index;
if (file_exists($path)) {
if($quiet!=true) {echo "Priority: ".$val." => Skipped: ".$path."\n";}
} else {
if($trailing_slash==true) {$url = rtrim($url,"/")."/";}
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 15);
curl_setopt ($ch, CURLOPT_HEADER, true);
curl_setopt ($ch, CURLOPT_NOBODY, true);
$ret = curl_exec ($ch);
curl_close ($ch);
if ($ret) {$i++;} else {echo "Unable to connect $url, exiting...";break;}
usleep($delay*1000000);
if($quiet!=true) {echo "Priority: ".$val." => Warmed: ".$path." by visiting ".$url."\n";}
}
if ($i < $ppi) {flush();} else {break;}
}
exit;
?>
While working with CoronaSDK I ended up using ui.lua for the buttons in our upcoming iPhone/iPad game. But I had hard time locating the latest version as many other developers had their own versions.
So, I have decided to make an ultimate latest version that will combine all previous enhancements along with my own. Copy of that Lua code is still available at Ansca code exchange.
NEW: Updated to eliminate the use of LUAs deprecated module() function. This is an internal change only, usage stays the same.
NEW: Added event support, now returns even.target, event.x & event.y values. You can use x/y values to provide different actions based on the coordinates of the touch event reative to the x/y size of the button image.
NEW: isActive state enhanced, so the button can be enabled/disabled without checking current isActive state with if-then.
-- ui.lua (currently includes Button class with labels, font selection and optional event model)
-- Version 2.4
-- Based on the folowing original provided by Ansca Inc.
-- Version 1.5 (works with multitouch, adds setText() method to buttons)
--
-- Copyright (C) 2010 ANSCA Inc. All Rights Reserved.
--
-- Permission is hereby granted, free of charge, to any person obtaining a copy of
-- this software and associated documentation files (the "Software"), to deal in the
-- Software without restriction, including without limitation the rights to use, copy,
-- modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
-- and to permit persons to whom the Software is furnished to do so, subject to the
-- following conditions:
--
-- The above copyright notice and this permission notice shall be included in all copies
-- or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
-- INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
-- PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
-- FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-- DEALINGS IN THE SOFTWARE.
-- Version 1.6 Works with Dynamic Scaling.
-- Based on the work edited by William Flagello, williamflagello.com
-- Original from https://developer.anscamobile.com/code/ui-library
--
-- Version 1.7 Dynamic Scaling text fixes by Jonathan Bebe
-- http://developer.anscamobile.com/forum/2010/12/17/easily-make-your-text-sharp-retina-displays#comment-18164
-- Provided in Ghosts & Monsters Sample Project
--
-- Version 1.71 Retina Updates by Jonathan Bebe
-- http://developer.anscamobile.com/forum/2010/12/17/easily-make-your-text-sharp-retina-displays#comment-38284
-- Adapted to 1.7 base code by E. Gonenc, pixelenvision.com
--
-- Version 1.8 added support for providing already realized display-objects for use in Tiled/Lime
-- Based on the file changed by Frank Siebenlist
-- http://developer.anscamobile.com/forum/2011/02/19/enhanced-uilua-v15
-- Adapted to 1.7 base code by E. Gonenc, pixelenvision.com
--
-- Version 1.9
-- Added transparency & scaling options to use as over state. newLabel updated to support retina text.
-- Edited by E. Gonenc, pixelenvision.com
--
-- Version 1.91
-- Added suggested fix for overlapping buttons by Jonathan Bebe
-- http://jonbeebe.net/to-return-true-or-not-to
-- Adapted by E. Gonenc, pixelenvision.com
--
-- Version 2.02
-- Button text will now follow scaling & alpha states of over button
-- Edited by E. Gonenc, pixelenvision.com
--
-- Version 2.1
-- Added suggested .isActive update by monoxgas http://developer.anscamobile.com/code/enhanced-ui-library-uilua#comment-49272
-- Edited by E. Gonenc, pixelenvision.com
--
-- Version 2.2
-- Updated to eliminate the use of LUAs deprecated module() function. This is an internal change only, usage stays the same.
-- http://blog.anscamobile.com/2011/09/a-better-approach-to-external-modules/
-- Edited by E. Gonenc, pixelenvision.com
--
-- Version 2.3
-- Updated to use object.contentBounds instead of deprecated object.stageBounds
-- Added event support, now returns even.target, event.x & event.y values. You can use x/y values to provide different actions
-- based on the coordinates of the touch event reative to the x/y size of the button image.
-- Edited by E. Gonenc, pixelenvision.com
--
-- Version 2.4
-- isActive state enhanced to button can be enabled/disabled without checking current isActive state with if-then.
-- ie. btn.isActive = true (Default state, button is enabled) btn.isActive = false (button is disabled, no animation and action)
-- Edited by E. Gonenc, pixelenvision.com
local M = {}
-------------
-- convenience test functions added by Frank.
local coronaMetaTable = getmetatable(display.getCurrentStage())
--- Test function that returns whether object is a Corona display object.
-- Note that all Corona types seem to share the same metatable...
local isDisplayObject = function(o)
return type(o) == "table" and getmetatable(o) == coronaMetaTable
end
-----------------
-- Helper function for newButton utility function below
local function newButtonHandler( self, event )
local result = true
local default = self[1]
local over = self[2]
local txt1,txt2,txt3
local OX,OY,SX,SY,SM
if self[3] then txt1 = self[3] end
if self[4] then txt2 = self[4] end
if self[5] then txt3 = self[5] end
if txt1 or txt2 or txt3 then
if display.contentScaleX < 1.0 or display.contentScaleY < 1.0 then SM = 2 else SM = 1 end
OX,OY = (over.xScale/default.xScale),(over.yScale/default.yScale)
SX,SY = (default.xScale/over.xScale),(default.yScale/over.yScale)
end
-- General "onEvent" function overrides onPress and onRelease, if present
local onEvent = self._onEvent
local onPress = self._onPress
local onRelease = self._onRelease
local buttonEvent = {}
if (self._id) then
buttonEvent.id = self._id
end
buttonEvent.isActive = self.isActive
buttonEvent.target = self
local phase = event.phase
if self.isActive then
if "began" == phase then
if over then
default.isVisible = false
over.isVisible = true
if txt1 then txt1:scale(OX,OY);txt1.alpha = over.alpha end
if txt2 then txt2:scale(OX,OY);txt2.alpha = over.alpha end
if txt3 then txt3:scale(OX,OY);txt3.alpha = over.alpha end
end
if onEvent then
buttonEvent.phase = "press"
buttonEvent.x = event.x - self.contentBounds.xMin
buttonEvent.y = event.y - self.contentBounds.yMin
result = onEvent( buttonEvent )
elseif onPress then
result = onPress( event )
end
-- Subsequent touch events will target button even if they are outside the contentBounds of button
display.getCurrentStage():setFocus( self, event.id )
self.isFocus = true
elseif self.isFocus then
local bounds = self.contentBounds
local x,y = event.x,event.y
local isWithinBounds =
bounds.xMin = x and bounds.yMin = y
if "moved" == phase then
if over then
-- The rollover image should only be visible while the finger is within button's stageBounds
default.isVisible = not isWithinBounds
over.isVisible = isWithinBounds
if txt1 and not isWithinBounds and txt1.xScale*SM == OX then txt1:scale(SX,SY);txt1.alpha = default.alpha
elseif txt1 and isWithinBounds and txt1.xScale*SM ~= OX then txt1:scale(OX,OY);txt1.alpha = over.alpha end
if txt2 and not isWithinBounds and txt2.xScale*SM == OX then txt2:scale(SX,SY);txt2.alpha = default.alpha
elseif txt2 and isWithinBounds and txt2.xScale*SM ~= OX then txt2:scale(OX,OY);txt2.alpha = over.alpha end
if txt3 and not isWithinBounds and txt3.xScale*SM == OX then txt3:scale(SX,SY);txt3.alpha = default.alpha
elseif txt3 and isWithinBounds and txt3.xScale*SM ~= OX then txt3:scale(OX,OY);txt3.alpha = over.alpha end
end
elseif "ended" == phase or "cancelled" == phase then
if over then
default.isVisible = true
over.isVisible = false
if txt1 and txt1.xScale*SM == OX then txt1:scale(SX,SY);txt1.alpha = default.alpha end
if txt2 and txt2.xScale*SM == OX then txt2:scale(SX,SY);txt2.alpha = default.alpha end
if txt3 and txt3.xScale*SM == OX then txt3:scale(SX,SY);txt3.alpha = default.alpha end
end
if "ended" == phase then
-- Only consider this a "click" if the user lifts their finger inside button's stageBounds
if isWithinBounds then
if onEvent then
buttonEvent.phase = "release"
buttonEvent.x = event.x - bounds.xMin
buttonEvent.y = event.y - bounds.yMin
result = onEvent( buttonEvent )
elseif onRelease then
result = onRelease( event )
end
end
end
-- Allow touch events to be sent normally to the objects they "hit"
display.getCurrentStage():setFocus( self, nil )
self.isFocus = false
end
end
end
return true
end
---------------
-- Button class
local function newButton( params )
local button, defaultSrc , defaultX , defaultY , overSrc , overX , overY , overScale , overAlpha , size, font, textColor, offset
local sizeDivide = 1
local sizeMultiply = 1
if display.contentScaleX < 1.0 or display.contentScaleY < 1.0 then
sizeMultiply = 2
sizeDivide = 0.5
end
if params.defaultSrc then
button = display.newGroup()
if isDisplayObject(params.defaultSrc) then
default = params.defaultSrc
else
default = display.newImageRect ( params.defaultSrc , params.defaultX , params.defaultY )
end
button:insert( default, false )
end
if params.overSrc then
if isDisplayObject(params.overSrc) then
over = params.overSrc
else
over = display.newImageRect ( params.overSrc , params.overX , params.overY )
end
if params.overAlpha then
over.alpha = params.overAlpha
end
if params.overScale then
over:scale(params.overScale,params.overScale)
end
over.isVisible = false
button:insert( over, false )
end
-- Public methods
function button:setText( newText )
local labelText = self.text
if ( labelText ) then
labelText:removeSelf()
self.text = nil
end
local labelShadow = self.shadow
if ( labelShadow ) then
labelShadow:removeSelf()
self.shadow = nil
end
local labelHighlight = self.highlight
if ( labelHighlight ) then
labelHighlight:removeSelf()
self.highlight = nil
end
if ( params.size and type(params.size) == "number" ) then size=params.size else size=20 end
if ( params.font ) then font=params.font else font=native.systemFontBold end
if ( params.textColor ) then textColor=params.textColor else textColor={ 255, 255, 255, 255 } end
size = size * sizeMultiply
-- Optional vertical correction for fonts with unusual baselines (I'm looking at you, Zapfino)
if ( params.offset and type(params.offset) == "number" ) then offset=params.offset else offset = 0 end
if ( params.emboss ) then
-- Make the label text look "embossed" (also adjusts effect for textColor brightness)
local textBrightness = ( textColor[1] + textColor[2] + textColor[3] ) / 3
labelHighlight = display.newText( newText, 0, 0, font, size )
if ( textBrightness > 127) then
labelHighlight:setTextColor( 255, 255, 255, 20 )
else
labelHighlight:setTextColor( 255, 255, 255, 140 )
end
button:insert( labelHighlight, true )
labelHighlight.x = labelHighlight.x + 1.5; labelHighlight.y = labelHighlight.y + 1.5 + offset
self.highlight = labelHighlight
labelShadow = display.newText( newText, 0, 0, font, size )
if ( textBrightness > 127) then
labelShadow:setTextColor( 0, 0, 0, 128 )
else
labelShadow:setTextColor( 0, 0, 0, 20 )
end
button:insert( labelShadow, true )
labelShadow.x = labelShadow.x - 1; labelShadow.y = labelShadow.y - 1 + offset
self.shadow = labelShadow
labelHighlight.xScale = sizeDivide; labelHighlight.yScale = sizeDivide
labelShadow.xScale = sizeDivide; labelShadow.yScale = sizeDivide
end
labelText = display.newText( newText, 0, 0, font, size )
labelText:setTextColor( textColor[1], textColor[2], textColor[3], textColor[4] )
button:insert( labelText, true )
labelText.y = labelText.y + offset
self.text = labelText
labelText.xScale = sizeDivide; labelText.yScale = sizeDivide
end
if params.text then
button:setText( params.text )
end
if ( params.onPress and ( type(params.onPress) == "function" ) ) then
button._onPress = params.onPress
end
if ( params.onRelease and ( type(params.onRelease) == "function" ) ) then
button._onRelease = params.onRelease
end
if (params.onEvent and ( type(params.onEvent) == "function" ) ) then
button._onEvent = params.onEvent
end
-- set button to active (meaning, can be pushed)
button.isActive = true
-- Set button as a table listener by setting a table method and adding the button as its own table listener for "touch" events
button.touch = newButtonHandler
button:addEventListener( "touch", button )
if params.x then
button.x = params.x
end
if params.y then
button.y = params.y
end
if params.id then
button._id = params.id
end
return button
end
M.newButton = newButton
--------------
-- Label class
local function newLabel( params )
local labelText
local size, font, textColor, align
local t = display.newGroup()
local sizeDivide = 1
local sizeMultiply = 1
if ( params.bounds ) then
local bounds = params.bounds
local left = bounds[1]
local top = bounds[2]
local width = bounds[3]
local height = bounds[4]
if ( params.size and type(params.size) == "number" ) then size=params.size else size=20 end
if ( params.font ) then font=params.font else font=native.systemFontBold end
if ( params.textColor ) then textColor=params.textColor else textColor={ 255, 255, 255, 255 } end
if ( params.offset and type(params.offset) == "number" ) then offset=params.offset else offset = 0 end
if ( params.align ) then align = params.align else align = "center" end
if ( params.text ) then
labelText = display.newText( params.text, 0, 0, font, size * 2 )
labelText.xScale = 0.5; labelText.yScale = 0.5
labelText:setTextColor( textColor[1], textColor[2], textColor[3], textColor[4] )
t:insert( labelText )
-- TODO: handle no-initial-text case by creating a field with an empty string?
if ( align == "left" ) then
labelText.x = left + labelText.contentWidth * 0.5
elseif ( align == "right" ) then
labelText.x = (left + width) - labelText.contentWidth * 0.5
else
labelText.x = ((2 * left) + width) * 0.5
end
end
labelText.y = top + labelText.contentHeight * 0.5
-- Public methods
function t:setText( newText )
if ( newText ) then
labelText.text = newText
if ( "left" == align ) then
labelText.x = left + labelText.contentWidth * 0.5
elseif ( "right" == align ) then
labelText.x = (left + width) - labelText.contentWidth * 0.5
else
labelText.x = ((2 * left) + width) * 0.5
end
end
end
function t:setTextColor( r, g, b, a )
local newR = 255
local newG = 255
local newB = 255
local newA = 255
if ( r and type(r) == "number" ) then newR = r end
if ( g and type(g) == "number" ) then newG = g end
if ( b and type(b) == "number" ) then newB = b end
if ( a and type(a) == "number" ) then newA = a end
labelText:setTextColor( r, g, b, a )
end
end
-- Return instance (as display group)
return t
end
M.newLabel = newLabel
return M
