preg_replace to add something after closing tag - PHP

PHP - preg_replace to add something after closing tag :

Here i will explain how to add something like string, char (or) any html tag after closing tag. Here we are using preg_replace() function to do it.

In the below example, add <br /> tag after closing of all <img> tag.

Syntax :

    preg_replace('/(<img[^>]+>(?:<\/img>)?)/i', '$1<br />', $str);
    
Note : This will match with <img />, <img>, <img></img> all of it.

Example :

    <?php
    
        $str = "<img src='img_path'>TechniqZone<img src='img_path'>";
        echo preg_replace('/(<img[^>]+>(?:<\/img>)?)/i', '$1<br />', $str);
        
    ?>
    
Output :

    <img src='img_path'><br />TechniqZone<img src='img_path'><br />
    
You can use this preg_replace() syntax for any of the html tags.

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htmlentities() and html_entity_decode() in JQuery

htmlentities() and html_entity_decode() in JQuery :


We are all know about use of htmlentities() in PHP. This function is used to convert all character to HTML entities. both function are used to treat string as a html and HTML as a string.
  
    For Example :
  
              
            echo htmlentities("TechniqZone");
          
         ?>
      
        Output :
      
            &lt ;a href=&#39 ;techniqzone.blogspot.in'&#39 ;&gt ;TechniqZone&lt ;/a&gt ; 
 // here semicolons (;) are placed with spaces for display here.
           
        This is very usefull in many places in php files to display html tags in website. But in javascript/JQuery, pre-defined encode decode function is not available.
      
        I hereby explained how to use encode and decode of HTML tags in JQuery. Before that need to know the diifference between JQuery.html() and JQuery.text().
      
            JQuery.html() - Treat string as HTML.
            JQuery.html() - Treat HTML as string.
          
        For Example :
      
            $("#techZone").html("<a href=''></a>");
            $("#techZone").text("<a href=''></a>");

Okay, now we create encode/decode custom function using JQuery.
  
        function htmlentities(str)
        {
            if(str) // check str is empty or not.
                return $("<div />").text(str).html();
            else
                return 'Argument mis-matched';
        }
      
        htmlentities("TechniqZone");
      
     Here create dummy <div> tag and append given string as text, after that take that dummy div text as html content.
  
     For decode,
  
        function html_entity_decode(str)
        {
            if(str) // check str is empty or not.
                return $("<div />").html(str).text();
            else
                return 'Argument mis-matched';
        }
  
        html_entity_decode("&lt ;a href=&#39 ;techniqzone.blogspot.in&#39 ;&gt ;TechniqZone&lt ;/a&gt ;");
// here semicolons (;) are placed with spaces for display here.

Note : htmlentities and html_entity_decode function are only working with jquery plugin files.

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Redirect with HTTP Status Code - PHP

Redirect with HTTP Status Code - PHP :

 

Redirect one url to another url using php is simply run with "header ("Location: redirectURL");" . But redirect with HTTP Status Code is more efficient to optimize for search engines.

    Here i will explain about php redirect with http status code. These http status code is common for all php versions.

<?php
function httpRedirect($code,$redirectURL){
   static $httpType = array (
       100 => "HTTP/1.1 100 Continue",
       101 => "HTTP/1.1 101 Switching Protocols",
       200 => "HTTP/1.1 200 OK",
       201 => "HTTP/1.1 201 Created",
       202 => "HTTP/1.1 202 Accepted",
       203 => "HTTP/1.1 203 Non-Authoritative Information",
       204 => "HTTP/1.1 204 No Content",
       205 => "HTTP/1.1 205 Reset Content",
       206 => "HTTP/1.1 206 Partial Content",
       300 => "HTTP/1.1 300 Multiple Choices",
       301 => "HTTP/1.1 301 Moved Permanently",
       302 => "HTTP/1.1 302 Found",
       303 => "HTTP/1.1 303 See Other",
       304 => "HTTP/1.1 304 Not Modified",
       305 => "HTTP/1.1 305 Use Proxy",
       307 => "HTTP/1.1 307 Temporary Redirect",
       400 => "HTTP/1.1 400 Bad Request",
       401 => "HTTP/1.1 401 Unauthorized",
       402 => "HTTP/1.1 402 Payment Required",
       403 => "HTTP/1.1 403 Forbidden",
       404 => "HTTP/1.1 404 Not Found",
       405 => "HTTP/1.1 405 Method Not Allowed",
       406 => "HTTP/1.1 406 Not Acceptable",
       407 => "HTTP/1.1 407 Proxy Authentication Required",
       408 => "HTTP/1.1 408 Request Time-out",
       409 => "HTTP/1.1 409 Conflict",
       410 => "HTTP/1.1 410 Gone",
       411 => "HTTP/1.1 411 Length Required",
       412 => "HTTP/1.1 412 Precondition Failed",
       413 => "HTTP/1.1 413 Request Entity Too Large",
       414 => "HTTP/1.1 414 Request-URI Too Large",
       415 => "HTTP/1.1 415 Unsupported Media Type",
       416 => "HTTP/1.1 416 Requested range not satisfiable",
       417 => "HTTP/1.1 417 Expectation Failed",
       500 => "HTTP/1.1 500 Internal Server Error",
       501 => "HTTP/1.1 501 Not Implemented",
       502 => "HTTP/1.1 502 Bad Gateway",
       503 => "HTTP/1.1 503 Service Unavailable",
       504 => "HTTP/1.1 504 Gateway Time-out"
   );
   header($httpType[$code]);
   header ("Location: $redirectURL");
}

httpRedirect(301,"http://techniqzone.blogspot.in/");

?>

Normally we do only header("Location: url"), here add header http status before redirect to given url.

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PHP Validate Credit Card Number

PHP Validate Credit Card Number :

 

Now a days , credit card purchase is happened in many websites. The below php function is used to validate the given credit card number in php.

function isCreditCardValid ( $number, $cctype )
{
    if ( !is_string ( $number)
         || !trim ( $number ) )
             return false;
      
    $ccs = array (

        // Master Card
        'master' => '/^(5[1-5]{1})(\d{14})$/',

        // American Express 
        'amex' => '/^3(4|7)\d{13}$/',
        
        // Discover Card 
        'discover' => '/^6(011|22|4|5)(\d{12}|\d{13}|\d{14})$/', 
        
        // Visa Card 
        'visa' => '/^4(\d{12}|\d{15})$/',

        // Dinners Club        
        'dinners' => '/^(305|36|38|54|55)(\d{12}|\d{14})$/',

        // Carte Blanche         
        'carte' => '/^(30[0-5]{1})(\d{11})$/', 
        
        // enRoute 
        'enroute' => '/^2(014|149)\d{11}$/', 
        
        // Laser
        'laser' => '/^6(304|706|771|709)(\d{12}|\d{13}|\d{14}'.
                   '|d{\15})$/', 
        
        // Visa Electron 
        'visaelec' => '/^4(17500|917|913|844|508)(\d{10}|\d{12})$/', 
    );

    if ( !is_string ( $cctype )
         || !array_key_exists( strtolower ($cctype) , $ccs ) )
             return false;

    return (bool) preg_match ( $ccs[$cctype], $number );
} 

 

Example :

<?php

if(isCreditCardValid("371449635398431","amex"))
{
                 echo "Valid";
}
else
{
                 echo "Not Valid";
}

?>

 

Here preg_match concept is used to identify the valid credit card number.

 

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MySQL query to trim particular character from database column field

MySQL has some default functions to trim particular cahr or whitespaces from all the column field in database rows. MySQL provide four type of methods to trim char.
1. TRIM()
2. TRIM(LEADING)
3. TRIM(BOTH)
4. TRIM(TRAILING)
we can use above four methods in select, update and delete queries.
1. TRIM()
    TRIM() function is used to remove the whitespaces from start and end of the string.
Query : select TRIM( TechniqZone );
Result : TechniqZone
    This is trim the whitespaces in all the column.
Example : update table_name set field1=TRIM(field1)
2. TRIM(LEADING)
    TRIM(LEADING) function is used to remove the given charecter from the starting postion of the string.
Query : select TRIM(LEADING "'" FROM "TechniqZone'");
Rssult : TechniqZone
  
    This method is remove the single quotes(') from al the column starting postion.
Example : update table_name set field1=TRIM(LEADING "'" FROM field1)
3. TRIM(BOTH)
    TRIM(BOTH) function is used to remove particular charecter from both start and end postion of the string.
Query : select TRIM(BOTH '"' FROM '"TechniqZone"');
Rssult : TechniqZone
    This is used to remove the double quotes (") from both position.
Example : update table_name set field1=TRIM(BOTH "'" FROM field1)
4. TRIM(TRAILING)
    TRIM(TRAILING) function is used to remove given charecter from end of the string.
Query : select TRIM(TRAILING '.com' FROM "TechniqZone.com");
Rssult : TechniqZone
    This MySQL query remove the .com from the end of the string.
Example : update table_name set field1=TRIM(TRAILING "xxx" FROM field1)
Note : TRIM() and TRIM(BOTH) is same as when we remove whitesapces from database column.

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Check String contains html tags and count of html tags using PHP

Here i will explain how to check the given string contains html tags or not.  this function return boolean value.
// Function for check html tag presents
function hasTags($str){ 
$htmlTags = array('A' ,'B', 'BODY', 'BR', 'BUTTON', 'DIV', 'FONT', 'H1', 'H2', 'H3', 'H4', 'H5', 'H6', 'IMG', 'INPUT', 'TABLE');
// Here you mention what are the html tags you want to check
 if(preg_match_all("~(<\/?)\b(".implode('|',$htmlTags).")\b([^>]*>)~i",$str,$matches)){
        return TRUE;
    }else{
        return FALSE;
    }
}
$str = 'Welcome to <h1><b></b></h1>';

if(hasTags($str)){
    echo 'HTML tags Found';
}else{
    echo 'HTML tags not found';
} 

If you want to get the present html tags count then consider the below function.

// Function for check html tag presents
function hasTags($str){
 $htmlTags = array('A' ,'B', 'BODY', 'BR', 'BUTTON', 'DIV', 'FONT', 'H1', 'H2', 'H3', 'H4', 'H5', 'H6', 'IMG', 'INPUT', 'TABLE');


// Here you mention what are the html tags you want to check
if(preg_match_all("~(<\/?)\b(".implode('|',$htmlTags).")\b([^>]*>)~i",$str,$matches)){
        return $matches[1];
    }else{
        return 0;
    }
}
$str = 'Welcome to <h1><b></b></h1>';

echo 'Tags Count = '.hasTags($str); 

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Email validation using JavaScript and Jquery

Email validation using JavaScript and Jquery :

 Here i will explain how to validate email id with JQuery. In JavaScript we can check the email id format only. but in jquery we can check whether we allow or not some of domain names also. First i will explain basic javascript method to validate email id.

Here is Javascript method :

function validateEmail(emailId)
{
var condition = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/;
return condition.test(emailId);
}

In this javascript method only validate the given email id has alphabets and numeric. Here the variable "condition" has the email conditions. that is

([a-zA-Z0-9_.+-]) - is to allow email id username with  alphabets and numeric and also _.
@(([a-zA-Z0-9-]) - is to allow domail name with alphabets and numeric . and
([a-zA-Z0-9]{2,4}) - is to allow last part of the email id i.e., com, in, .. with alphabets and numeric and also                                   it's length should be 2 to 4.

Now i will explain how to validate email id with JQuery.

Here is JQuery Method :

$(document).ready(function() {

  $('#submitButton').click(function() {

    var emailCon = /^([\w-\.]+@([\w-]+\.)+[\w-]{2,4})?$/;
    var emailblockCon =/^([\w-\.]+@(?!gmail.com)(?!yahoo.com)([\w-]+\.)+[\w-]{2,4})?$/;

    var emailId = $("#mailId").val();
    if(emailId == '') {
      $("#mailId").val('Email id is Blank.');
      error = true
    }

    else if(!emailCon.test(emailId)) {
      $("#mailId").val('Check Your Email id.');
      error = true
    }

    else if(!emailblockCon.test(emailId)) {
      $("#mailId").val('gmail and yahoo mail ids not accept.');
      error = true
    }

    if(error == true) {
           return false;
    }

    });
}); 

In this JQuery method you can check the email format like in javascript . In jquery we validate extra one condition. here we validate the email id domain name also. because some of the website doesnt allow some free email providers domain. so we can also validate it here.

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PHP - Validate Email Id

PHP - Validate Email Id :

 Here i will explain how to validate email id in php. This is very use full to validate email id in server side. php is used in server so we can validate email id in server side. if you want to validate email id in client side then you can use JavaScript, jquery etc...

 The below example will show you how to validate email id in PHP

Example :
<?php
$mailId = "xxx@gmail.com"; // Valid email
$conditions = '/^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([comco.in])+$/';
if (preg_match($conditions, $mailId))
{
echo "Valid Mail Id";
}
else
{
echo "Invalid Mail Id";
}
?&gt;





 In the above example "$mailId" having the email id given by user. and "$conditions" having conditions for validate given email id. here i used "preg_match()" predefined php function. this function return boolean value. if the match occurred then it will return true otherwise false.

 The above example print "Valid Mail Id". Here the variable "$conditions" have "com","co","in" conditions only, so it will allow these extension mail id only. and it will validate all allowed special characters only.

 if A$mailId="xxx@gmailo.comnm" then the output is "Invalid Mail Id".

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