I am using regular expression to get the text inside a single p tag targeting its class. the problem is I want to use a php variable as class name and use a loop to change the class name each time.

$sample = get_the_content(); 


<button class="accordion">
preg_match('/<strong class="1">(.*?)<\/strong>/s', $sample, $match); 
echo $match[1]; 


$className = "1";

I want to use the $classname varialbe up there and increment it in a loop to get different paragraph content each time.

I hope I am clear in my question.

I am using regular expression to get the text inside a single p tag targeting its class. the problem is I want to use a php variable as class name and use a loop to change the class name each time.

$sample = get_the_content(); 


<button class="accordion">
preg_match('/<strong class="1">(.*?)<\/strong>/s', $sample, $match); 
echo $match[1]; 


$className = "1";

I want to use the $classname varialbe up there and increment it in a loop to get different paragraph content each time.

I hope I am clear in my question.

• regex

3 Answers 3

Note: this question is not related to WordPress, but rather to PHP directly and should be asked at StackOverflow but I have provided a very basic answer below to help you on your way. However be aware that this answer is not necessarily the best way to go about solving your problem, nor is it meant to be efficient.

// assuming get_the_content() equates to ↓

$content = '<p class="1">P1 Content</p><p class="2">P2 Content</p><p class="3">P3 Content</p>';

$classNames = ['1', '2', '3'];

$matches = [];

foreach( $classNames as $className ) {

    $pattern = sprintf('\<p\sclass=\"%s\"\>(.*?)\<\/p\>', $className);

    preg_match("/{$pattern}/i", $content, $found); 

    $matches[] = $found;

}

var_dump($matches);

/*
array(3) {
  [0]=>
  array(2) {
    [0]=>
    string(27) "<p class="1">P1 Content</p>"
    [1]=>
    string(10) "P1 Content"
  }
  [1]=>
  array(2) {
    [0]=>
    string(27) "<p class="2">P2 Content</p>"
    [1]=>
    string(10) "P2 Content"
  }
  [2]=>
  array(2) {
    [0]=>
    string(27) "<p class="3">P3 Content</p>"
    [1]=>
    string(10) "P3 Content"
  }
}
*/

UPDATE 1:

If you do not have a fixed, known-list (ahead of time) of class names, then use the following example which utilises preg_match_all and looks for any <P> tag with class = NUMBER.

<p class="1">Content</p>
<p class="2">Content</p>
<!-- etc.. -->
<p class="234">Content</p>

$content = '<p class="1">P1 Content</p><p class="2">P2 Content</p><p class="3">P3 Content</p>';

$pattern = sprintf('\<p\sclass=\"%s\"\>(.*?)\<\/p\>', '[0-9]+');

var_dump($pattern);

preg_match_all("/{$pattern}/i", $content, $found);

var_dump($found);

/*
array(2) {
  [0]=>
  array(3) {
    [0]=>
    string(27) "<p class="1">P1 Content</p>"
    [1]=>
    string(27) "<p class="2">P2 Content</p>"
    [2]=>
    string(27) "<p class="3">P3 Content</p>"
  }
  [1]=>
  array(3) {
    [0]=>
    string(10) "P1 Content"
    [1]=>
    string(10) "P2 Content"
    [2]=>
    string(10) "P3 Content"
  }
}
*/

/**
 * Iterate over the results (if any) and do something with the content.
 */
if ( is_array($found) && isset($found[1]) ) {

    foreach( $found[1] as $content ) {

        echo $content;

    }

}

Results in:

P1 Content
P2 Content
P3 Content

I advise that you prefix your class names such as:

<p class="myprefix-1">Content</p>
<p class="myprefix-2">Content</p>
<!-- etc.. -->
<p class="myprefix-234">Content</p>

If so, make sure to update your regex pattern:

$pattern = sprintf('\<p\sclass=\"myprefix-%s\"\>(.*?)\<\/p\>', '[0-9]+');

REPL.IT DEMO

I found a solution for my question and I like to share it:

for this I simply created a php variable and added that in the middle of the parameter:

$sample = get_the_content(); 

$classes = '1';
<button class="accordion">
preg_match('/<p class="'.$classes.'">(.*?)<\/p>/s', $sample, $match); 
echo $match[1];

I am still confused how to increment the class by 1 to get different content each time.

Dear "Adam" this is what I am trying to do but I have issue in the length of array.

$tkey = 'post-update';

$update = new WP_Query(array(
    'posts_per_page' => -1,
    'tag' => $tkey
));

wp_reset_postdata();

if ($update->have_posts()) {
    while ($update->have_posts()) {
        $update->the_post();
        $sample = get_the_content();
    }
}

$classes = array();
array_push($classes, $match);

foreach ($classes as $names => $text) {

?>
    <button class="accordion">
        <?php
        preg_match('/<strong class="' . $text . '">(.*?)<\/strong>/s', $sample, $match);
        echo $match[1];
        ?>
    </button>
    <div class="panel">
        <p>
            <?php
            preg_match('/<p class="' . $text . '">(.*?)<\/p>/s', $sample, $match);
            echo $match[1];
            ?>
        </p>
    </div>
<?php } ?>
</div>