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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