Extract and replace strings using preg_match regular expressions in wordpress

Run the following code:

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Width = "60" height = "60" class = "alignnone size-full wp-image-2100"/>

When the output is displayed, replace it:

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<Div class = "gif-box"> _ Src = "/wp-content/uploads/2014/02/hbzy1.jpg! Static" Class = "alignnones size-full wp-image-2100" Tsrc = "/wp-content/uploads/2014/02/hbzy1.jpg" width = "60" height = "60"/> <Div class = "gif-loading-box"> <I class = "gif-loading" style = "display: none;"> </I> <I class = "gif-play"> </I> </Div> </Div>

This is to enable the dynamic GIF image to be played only when it is clicked by default. In this case, preg_match and regular expression are used to match the image code, and str_replace is used to replace and modify strings.

The code is as follows:

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Function gif_content ($ content ){ $ Content = get_the_content (); $ Img_html = preg_match ('/(] +>)/I', $ content, $ maches); // Obtain the img Image html, such: // www.111cn.net $ Img_html = $ maches [0];   $ Img_width = preg_match ('/width = "[0-9] +"/I', $ img_html, $ maches); // Obtain the image width, for example: width = "32" $ Img_width = str_replace ('=', ':', $ maches [0]); $ Img_width = str_replace ('"','', $ img_width ); $ Img_width = $ img_width. 'Px '; // replace the value with width: 32px.   $ Img_height = preg_match ('/height = "[0-9] +"/I', $ img_html, $ maches ); $ Img_height = str_replace ('=', ':', $ maches [0]); $ Img_height = str_replace ('"','', $ img_height ); $ Img_height = $ img_height. 'Px ';   $ Img_name = preg_match ('! Http: //. + .(? : Jpe? G | png | gif )! Ui ', $ img_html, $ maches ); $ Img_name = $ maches [0];   $ Img_html2 = str_replace ('src = "'. $ img_name.'" ', 'src = "'. $ img_name .'! Static "_ src =" '. $ img_name .'! Static '.' "tsrc =" '. $ img_name.' "', $ img_html ); $ Img_html2 = '<div class = "gif-box" style = "'. $ img_width. ';'. $ img_height. '"> '. $ img_html2. '<div class = "gif-loading-box"> <I class = "gif-loading" style = "display: none; "> </I> <I class =" gif-play "> </I> </div> '; // add a div before and after the html code of the image   $ Content = str_replace ($ img_html, $ img_html2, $ content ); Return $ content; }   Add_filter ('The _ content', 'gif _ content', 10); // hook function of wordpress

This is used in wordpress document form. When the document form is image, perform this operation for the image in this document form.

In addition, use the following code in index. php:

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$ Format = get_post_format (); If ('image '! = $ Format ){ Remove_filter ('The _ content', 'gif _ content '); } Get_template_part ('content', get_post_format ());

Here, we need to determine if this hook is removed from other document forms, otherwise all document images will be subjected to such operations.

This article describes how to extract and replace strings using the preg_match regular expression and the article form of wordpress.